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+# Remote BIOS Configuration (RBC) via BMC
+
+Author:
+  Suryakanth Sekar! ssekar
+
+Primary assignee:
+  Suryakanth Sekar! ssekar
+
+Other contributors:
+  Jia Chunhui
+  Deepak Kodihalli
+  Patrick Williams
+
+Created: 19-Nov-2019
+
+## Problem Description
+Current OpenBMC doesn't provide mechanism to configure the BIOS remotely.
+This is needed in data center to maintain several systems under
+same configuration.
+
+Remote BIOS Configuration provides ability for the user to view and modify
+BIOS setup configuration parameters remotely via a BMC at any Host state.
+New BIOS configuration parameters take effect immediately or next
+system reboot based on the host firmware support model.
+
+## Background and References
+[1] https://www.dmtf.org/sites/default/files/standards/documents/DSP0247_1.0.0.pdf
+[2] https://redfish.dmtf.org/schemas/v1/Bios.v1_1_0.json
+[3] https://redfish.dmtf.org/schemas/v1/AttributeRegistry.v1_3_2.json
+
+## Requirements
+1. Mechanism to configure BIOS settings remotely over network interface.
+2. BMC should support the ability to set the value of all BIOS variables
+   to the factory default state.
+3. Based on the host firmware support model, BMC should support both
+   Immediate Update or Deferred update.
+4. In deferred model, When the system is in S0, S3, S4 or S5 state.
+   BMC will send the updated BIOS variables on next BIOS boot only.
+   It will not initiate a BIOS boot immediately.
+5. In immediate model, BMC should send message to the system firmware (BIOS)
+   Whenever settings are changed.
+6. BMC should support BIOS attribute registry in redfish schema for
+   BIOS configuration.
+7. BMC should provide secure way for updating BIOS setup password settings.
+   Detailed password handling design -TBD(will be resolve using ARM TrustZone)
+Ex: Updating the BIOS password should be support only before end of post.
+8. Remote BIOS configuration daemon should be independent of interface specific
+   data format.
+9. BMC should able to take default / current settings from host and store &
+   expose that for out of band updates.
+10.BMC should provide the new values to the host.
+
+
+## Proposed Design
+
+```
++----------------------------------------------------------------------------------------------------------------+
+| Remote BIOS configuration (RBC) via BMC                                                                        |
+|                                                                                                                |
+|                                                                                                                |
+| +-------------+       +-------------+       +--------------------------------+      +-------+                  |
+| |             |       |             |       |   RBC daemon                   |      |       |    +----------+  |
+| | NET/ Tools  +<-LAN->+ LAN-IPMID/  +<Dbus->+                                |      |       |    |Web client|  |
+| |             |       | REDFISH     |       |  Provide following Methods     |      |       |    |          |  |
+| +-------------+       +-------------+       |     -SetPendingAttributes()    |      |       |    +----^-----+  |
+|                                             |     -GetPendingAttributes()    |      |       |         |        |
+| +-------------+       +-------------+       |     -SetAttribute()            |      |       |        LAN       |
+| |             |       |             |       |     -GetAttribute()            |      |       |         |        |
+| | HOST/ BIOS  +<-KCS->+  HOST-IPMID +<Dbus->+                                |      |Redfish|    +----V-----+  |
+| |             |       |             |       | Properities                    +<Dbus>+  API  |    |Redfish & |  |
+| +-----+-------+       +-------------+       |     -AllBaseAttributes         |      |       +<-->+BMCWeb    |  |
+|       |                                     |     -ResetBIOSSettings         |      |       |    +----^-----+  |
+|       |                                     |                                |      |       |         |        |
+|       |                                     |                                |      |       |         |        |
+|       |                                     |                                |      |       |    +----V-----+  |
+|       |                                     |                                |      |       |    | Redfish  |  |
+|       |                                     |                                |      |       |    |  Host    |  |
+|       |                                     |                                |      |       |    | Interface|  |
+|       |                                     +----^-----------------+---------+      +-------+    +----------+  |
+|       |                                          |       PendingAttributesUpdated                              |
+|       |                                          |                 |    Signal                                 |
+|       |                                          |                 |                                           |
+|       |                                     +----V-----------------V---------+                                 |
+|       |                                     | PLDM daemon                    |                                 |
+|       |                                     | Collect the BIOS data & convert|                                 |
+|       +---------MCTP----------------------->| into native D-bus format and   |                                 |
+|                                             | send to the RBC                |                                 |
+|                                             +--------------------------------+                                 |
++----------------------------------------------------------------------------------------------------------------+
+```
+
+
+
+##Intel uses the following logic
+
+BIOS send data in as Proprietary format to the BMC via IPMI interface.
+There are two types of proprietary XML format files in BIOS configuration.
+Type-0 contain full BIOS variables in XML format. (Generated by BIOS)
+Type-1 contain modified BIOS variables in XML format. (Generated by BMC)
+
+BIOS must provide BIOS capability via KCS interface in early boot stage.
+BIOS must send compressed proprietary XML type 0 file via
+IPMI command to the BMC.
+
+IPMI interface should decompress & validate the received XML Type 0.
+IPMI interface should convert the XML Type 0 into native to D-bus format
+and send to the RBC daemon.
+
+
+During BDS phase in BIOS. BIOS must get the existing XML info from BMC.
+If XML version/checksum is mismatch or XML Type 0 is not present in BMC, then
+BIOS must send XML type 0 to the BMC. If XML version and XML checksum matched
+& pending BIOS attributes list exist (XML Type 1) in BMC then BIOS must get
+pending BIOS configuration (XML Type 1) from BMC & update in BIOS region and
+send updated XML Type 0 to the BMC in order to intact again and then BIOS reset
+the system to reflect the updated values in BIOS boot.
+
+BIOS have default BIOS settings in BIOS non-volatile memory. BIOS can restore
+the default BIOS configuration based on the flag setting in OEM IPMI command
+issued during BIOS booting.
+So, restore default BIOS configuration can be done by this mechanism.
+
+RBC daemon should preserve the AllBiosTables, PendingAttributes list in
+non-volatile storage.
+Pending attributes list will be cleared whenever new attributes data received.
+
+```
+#Intel uses the following logic for BIOS first boot
+   +---------------------------------------------------------------------------------------------------------------------+
+   |                                                                                                                     |
+   | +-----------------------+             +----------------------------------------------------------------------------+|
+   | | BIOS                  |             |   BMC                                                                      ||
+   | |                       |             |  +-------------------------------+        +------------------------------+ ||
+   | |                       |             |  |IPMI Interface (kcs)           |        |RBC daemon Manager            | ||
+   | |                       |             |  | -Responsible for send /recv   |        |-Responsible for handling BIOS| ||
+   | |                       |             |  |  data between BIOS and BMC    |        | configuration attributes.    | ||
+   | |                       |             |  |                               |        | -AllBaseAttributes           | ||
+   | |                       |             |  |                               |        | -Pending Attributes          | ||
+   | |                       |             |  |                               |        | -FactoryDefaultSetting       | ||
+   | |                       |             |  |                               |        | -BIOSPwdHashData             | ||
+   | |                       |             |  +-------------------------------+        +------------------------------+ ||
+   | +-----------------------+             |  +-------------------------------+         +-----------------------------+ ||
+   | | Set BIOS capability   |<---Req-/Res--> | Set the BIOS capability       |         |                             | ||
+   | |                       |             |  |                               |         |                             | ||
+   | |Set BIOS Pwd hash/Seed |<---Req-/Res--> | Forward to the RBC daemon     |--dbus-->| Set BIOSPwdHash data.       | ||
+   | |                       |             |  |                               |         |                             | ||
+   | |                       |             |  |                               |         |                             | ||
+   | |Check factory settings |<---Req-/Res--> |  Get the FactoryDefault prop  |<-dbus-- | Send FactoryDefaultSettings | ||
+   | |Init the BIOS config   |             |  |                               |         |                             | ||
+   | |Based on value.        |             |  |                               |         |                             | ||
+   | |Get the XML Type0 info |<---Req-/Res--> | Provide the XML Type 0 Info   |         |                             | ||
+   | |Generate & compress    |             |  |                               |         |                             | ||
+   | |XML type 0 file        |             |  | Validate the XML Type 0       |         |Collect the Attributes Info  | ||
+   | |                       |             |  | Unzip the XML Type 0          |--dbus-->| AllBaseAttributes           | ||
+   | | Send the XML Type 0   |<---Req-/Res--->| Convert into D-bus format     |                                       | ||
+   | | via SetPayload command|             |  | and send to the RBC.          |         |                             | ||
+   | |                       |             |  |                               |         |                             | ||
+   | | Continue the BIOS boot|             |  |                               |         |                             | ||
+   | +-----------------------+             |  +-------------------------------+         +-----------------------------+ ||
+   |                                       +----------------------------------------------------------------------------+|
+   +---------------------------------------+-----------------------------------------------------------------------------+
+```
+```
+#Intel uses the following logic for BIOS reset
+   +---------------------------------------------------------------------------------------------------------------------+
+   |                                                                                                                     |
+   | +-----------------------+             +----------------------------------------------------------------------------+|
+   | | BIOS                  |             |   BMC                                                                      ||
+   | |                       |             |  +-------------------------------+        +------------------------------+ ||
+   | |                       |             |  |IPMI Interface (kcs)           |        |RBC daemon Manager            | ||
+   | |                       |             |  | -Responsible for send /recv   |        |-Responsible for handling BIOS| ||
+   | |                       |             |  |  data between BIOS and BMC    |        | configuration attributes.    | ||
+   | |                       |             |  |                               |        | -AllBaseAttributes           | ||
+   | |                       |             |  |                               |        | -Pending Attributes          | ||
+   | |                       |             |  |                               |        | -FactoryDefaultSetting       | ||
+   | |                       |             |  |                               |        | -BIOSPwdHashData             | ||
+   + |                       |             |  +-------------------------------+        +------------------------------+ ||
+   | +-----------------------+             |  +-------------------------------+         +-----------------------------+ ||
+   | |Set BIOS capability    |<---Req-/Res--> | Set the BIOS capability       |         |                             | ||
+   | |                       |             |  |                               |         |                             | ||
+   | |Set BIOS Pwd hash/Seed |<---Req-/Res--> | Forward to the RBC daemon     |--dbus-->| Set BIOSPwdHash data        | ||
+   | |                       |             |  |                               |         |                             | ||
+   | |                       |             |  |                               |         |                             | ||
+   | |Check factory settings |<---Req-/Res--> | Get the FactoryDefault prop   |<-dbus-- | Send FactoryDefaultSettings | ||
+   | |Init the BIOS config   |             |  |                               |         |                             | ||
+   | |Based on value.        |             |  |                               |         |                             | ||
+   | |Get the XML Type 0 info|<---Req-/Res--> | Provide the XML Type 0 Info   |         |                             | ||
+   | |Generate & compress    |             |  |                               |         |                             | ||
+   | |XML type 0 file.       |             |  |                               |         |Collect the Attributes Info  | ||
+   | |Check XML file Chksum. |             |  | Validate the XML Type 0       |--dbus-->| AllBaseAttributes           | ||
+   | |If Chksum mismatch     |<---Req-/Res--->| Unzip XML Type 0 & convert    |         |                             | ||
+   | |then send the payload  |             |  | into D-bus format and send to |         |                             | ||
+   | |via SetPayload.        |             |  | the RBC                       |         |                             | ||
+   | |Continue the BIOS boot |             |  |                               |         |                             | ||
+   | +-----------------------+             |  +-------------------------------+         +-----------------------------+ ||
+   |                                       +----------------------------------------------------------------------------+|
+   +---------------------------------------+-----------------------------------------------------------------------------+
+```
+```
+#Intel uses the following logic for BIOS reset and BMC have new values
+   +---------------------------------------------------------------------------------------------------------------------+
+   |                                                                                                                     |
+   | +-----------------------+             +----------------------------------------------------------------------------+|
+   | | BIOS                  |             |   BMC                                                                      ||
+   | |                       |             |  +-------------------------------+        +------------------------------+ ||
+   | |                       |             |  |                               |        |                              | ||
+   | |                       |             |  |IPMI Interface (kcs)           |        |RBC daemon Manager            | ||
+   | |                       |             |  | -Responsible for send /recv   |        |-Responsible for handling BIOS| ||
+   | |                       |             |  |  data between BIOS and BMC    |        | configuration attributes.    | ||
+   | |                       |             |  |                               |        | -AllBaseAttributes           | ||
+   | |                       |             |  |                               |        | -Pending Attributes          | ||
+   | |                       |             |  |                               |        | -FactoryDefaultSetting       | ||
+   | |                       |             |  |                               |        | -BIOSPwdHashData             | ||
+   + |                       |             |  +-------------------------------+        +------------------------------+ ||
+   | +-----------------------+             |  +-------------------------------+         +-----------------------------+ ||
+   | |Set BIOS capability    |<---Req-/Res--> | Set the BIOS capability       |         |                             | ||
+   | |                       |             |  |                               |         |                             | ||
+   | |Set BIOS Pwd hash/Seed |<---Req-/Res--> | Forward to the RBC daemon     |---dbus->| Set BIOSPwdHash data        | ||
+   | |                       |             |  |                               |         |                             | ||
+   | |                       |             |  |                               |         |                             | ||
+   | |Check factory settings |<---Req-/Res--> | Get the FactoryDefault prop   |<--dbus--| Send FactoryDefaultSettings | ||
+   | |Init the BIOS config   |             |  |                               |         |                             | ||
+   | |Based on value.        |             |  |                               |         |                             | ||
+   | |Get the XML Type 0 info|<---Req-/Res--> | Provide the XML Type 0 Info   |         |                             | ||
+   | |Generate & compress    |             |  |                               |         |                             | ||
+   | |XML Type 0 file.       |             |  |                               |         |                             | ||
+   | |Check XML file Chksum. |             |  |                               |         |                             | ||
+   | |If Chksum   match      |<---Req-/Res--->| Provide the XML Type 0        |         |                             | ||
+   | |then get the XML Type 1|             |  |                               |         |                             | ||
+   | |via GetPayload.        |             |  |                               |         |                             | ||
+   | |Get  the XML Type 1    |             |  |                               |         |                             | ||
+   | |via GetPayload command.|<---Req-/Res--->| Provide the XML Type 1        |         |                             | ||
+   | |                       |             |  |                               |         |                             | ||
+   | |Update the new value   |             |  |                               |         |                             | ||
+   | |and new chksum in      |<---Req-/Res--->| Get new XML Type 0 & convert  |--dbus-->| Collect the Atributes info  | ||
+   | |BIOS.                  |             |  | into native to D-bus format   |         | AllBaseAttributes           | ||
+   | |Reset the system.      |             |  |                               |         |                             | ||
+   | +-----------------------+             |  +-------------------------------+         +-----------------------------+ ||
+   |                                       +----------------------------------------------------------------------------+|
+   +---------------------------------------+-----------------------------------------------------------------------------+
+
+```
+
+##BIOS send the data in BIOS configuration PLDM via MCTP
+
+BIOS should update the BIOS settings via Set BIOS table PLDM command-
+BIOS string table, Attribute name table, Attribute value table via MCTP.
+
+RBC daemon should create pending BIOS attributes list based on the
+user input configuration and send PendingAttributesUpdated signal.
+
+PLDM daemon should register for PendingAttributesUpdated signal & RBC daemon
+should generate signal whenever attribute value changed by SetPendingAttributes,
+set attribute D-bus call. PLDM should Wait for PendingAttributesUpdated signal
+and pull the pending attributes value from RBC daemon. PLDM should delete the
+Pending attributes value table once its not valid or updated in BIOS.
+RBC should clear pending attributes list whenever new attributes data received.
+
+RBC daemon should preserve the AllBaseAttributes, PendingAttributes list in
+non-volatile storage. PLDM daemon should preserve BIOS tables in non-volatile
+storage. RBC and PLDM should restored the data whenever BMC reset.
+
+
+
+#BIOS first boot
+   +--------------------------------------------------------------------------------------------------------------------+
+   | +-----------------------+             +---------------------------------------------------------------------------+|
+   | | BIOS                  |             |   BMC                                                                     ||
+   | |                       |             |  +-------------------------------+         +-----------------------------+||
+   | |                       |             |  |PLDM Interface (MCTP)          |         |RBC Daemon Manager           |||
+   | |                       |             |  | -Responsible for send /recv   |         |-Responsible for handle BIOS |||
+   | |                       |             |  |  data between BIOS and BMC    |         | configuration attributes.   |||
+   | |                       |             |  |                               |         | -AllBaseAttributes          |||
+   | |                       |             |  |                               |         | -Pending Attributes         |||
+   | |                       |             |  |                               |         | -FactoryDefaultSetting      |||
+   | |                       |             |  |                               |         | -BIOSPwdHashData            |||
+   + +-----------------------+             |  +-------------------------------+         +-----------------------------+||
+   | |Get the table info     |<---Req-/Res--> | Provide the table information |         |                             |||
+   | | & Check table Tag     |             |  |                               |         |                             |||
+   | |using GetBIOS table    |             |  |                               |         |                             |||
+   | |                       |             |  |                               |         |                             |||
+   | |Set BIOS string table  |<---Req-/Res--> | Get the string table          |         |                             |||
+   | | via Set BIOS table    |             |  |                               |         |                             |||
+   | |SetBIOSAttribute table |<---Req-/Res--> | Get the attributes table      |         |                             |||
+   | |SetBIOSAttributeValue  |<---Req-/Res--> | Get the attributes value table|         |                             |||
+   | |table via SetBIOStable |             |  |                               |         |                             |||
+   | |table via SetBIOStable |             |  |                               |         |                             |||
+   | |Init the BIOS config   |             |  | Send the attributes data in   |         |                             |||
+   | |Based on value.        |             |  | native to D-bus format        |--dbus-->| AllBaseAttributes           |||
+   | |via Set BIOS table     |             |  | by Setting AllBaseAttributes  |         |                             |||
+   | |                       |             |  |                               |         |                             |||
+   | | Continue the BIOS boot|             |  |                               |         |                             |||
+   | +-----------------------+             |  +-------------------------------+         +-----------------------------+||
+   |                                       +---------------------------------------------------------------------------+|
+   +---------------------------------------+----------------------------------------------------------------------------+
+
+
+#BIOS reset
+   +--------------------------------------------------------------------------------------------------------------------+
+   | +-----------------------+             +---------------------------------------------------------------------------+|
+   | | BIOS                  |             |   BMC                                                                     ||
+   | |                       |             |  +-------------------------------+         +-----------------------------+||
+   | |                       |             |  |PLDM Interface (MCTP)          |         |RBC Daemon Manager           |||
+   | |                       |             |  | -Responsible for send /recv   |         |-Responsible for handle BIOS |||
+   | |                       |             |  |  data between BIOS and BMC    |         | configuration attributes.   |||
+   | |                       |             |  |                               |         | -AllBaseAttributes          |||
+   | |                       |             |  |                               |         | -Pending Attributes         |||
+   | |                       |             |  |                               |         | -FactoryDefaultSetting      |||
+   | |                       |             |  |                               |         | -BIOSPwdHashData            |||
+   | +-----------------------+             |  +-------------------------------+         +-----------------------------+||
+   | |Get the table info     |<---Req-/Res--> | Provide the table information |         |                             |||
+   | | & Check table Tag     |             |  |                               |         |                             |||
+   | |using GetBIOS table    |             |  |                               |         |                             |||
+   | |                       |             |  |                               |         |                             |||
+   | | Get the Pending table |<---Req-/Res--> | Provide the Pending attributes|         |                             |||
+   | | using Get BIOS table  |             |  | table                         |         |                             |||
+   | |                       |             |  |                               |         |                             |||
+   | |SetBIOSAttributeValue  |<---Req-/Res--> | Get the attributes table      |         |                             |||
+   | |table via SetBIOStable.|             |  | Delete the Pending attributes |         |                             |||
+   | |Init the BIOS config   |             |  | table                         |         |                             |||
+   | |Based on value.        |             |  |                               |         |                             |||
+   | |                       |             |  | Send the attributes data in   |         |                             |||
+   | |                       |             |  | native to D-bus format by     |--dbus-->| AllBaseAttributes           |||
+   | | Reset the BIOS boot   |             |  | setting AllBaseAttributes     |         |                             |||
+   | +-----------------------+             |  +-------------------------------+         +-----------------------------+||
+   |                                       +---------------------------------------------------------------------------+|
+   +---------------------------------------+----------------------------------------------------------------------------+
+
+##Complete BIOS BMC flow for BIOS configuration in deferred update model
+```
++----------------------------------------+                    +----------------------------------------+
+|                BIOS                    |                    |                  BMC                   |
+|                                        |                    |                                        |
+|  +----------------------------------+  |                    | +------------------------------------+ |
+|  | Send the BIOS capability  Support|  |--------KCS-------->| |1.Get the complete atttributes data.| |
+|  | Send the compressed BIOS file(or)|  |-MCTP/KCS/Redfish-->| |2.Validate and convert into         | |
+|  | Send PLDM data via MCTP  (or)    |  |                    | |  native to D-bus format.           | |
+|  | Send the Redfish host interface  |  |                    | |3.Expose the D-bus interface        | |
+|  +----------------------------------+  |                    | +------------------------------------+ |
+|                                        |                    |                                        |
+|  +----------------------------------+  |                    |                                        |
+|  | Get the file info & config status|   <-Get config status-|                                        |
+|  | - Any config changed or not      |  |                    |                                        |
+|  | - File checksum in BMC           |  |                    |                                        |
+|  | - New attribute values exist     |  |                    |                                        |
+|  +----------------------------------+  |                    |                                        |
+|                                        |                    |  +-----------------------------------+ |
+|  +----------------------------------+  |                    |  |                                   | |
+|  | If new attribute value exist     |<-|-----------------------|  Send the new value attributes    | |
+|  |           then                   |  |                    |  |  (Pending Attributes list)        | |
+|  | Get & Update the BIOS variables  | -| -----+             |  |                                   | |
+|  |                                  |  |      |             |  +-----------------------------------+ |
+|  +---------------+------------------+  |      |             |                                        |
+|                  |                     |      |             |                                        |
+|                  YES                   |      |             |                                        |
+|                  |                     |      |             |  +----------------------------------+  |
+|   +--------------V------------------+  |      |             |  |                                  |  |
+|   |  Send the updated data to BMC   |  |      |             |  | Update the BIOS attributes       |  |
+|   |                                 |------------------------->| (AllBaseBiosTables)              |  |
+|   +---------------------------------+  |      |             |  +----------------------------------+  |
+|                                        |      |             |                                        |
+|                                        |      |             |                                        |
+|   +---------------------------------+  |      |             |                                        |
+|   | Reset the BIOS for BIOS conf    |  |     NO             |                                        |
+|   | update                          |  |      |             |                                        |
+|   +---------------------------------+  |      |             |                                        |
+|                                        |      |             |                                        |
+|  +----------------------------------+  |      |             |                                        |
+|  |  Continue the BIOS boot          | <-------+             |                                        |
+|  +----------------------------------+  |                    |                                        |
++----------------------------------------+                    +----------------------------------------+
+```
+
+##Complete BIOS BMC flow for BIOS configuration in immediate update model
+```
++----------------------------------------+                    +----------------------------------------+
+|                BIOS                    |                    |                  BMC                   |
+|                                        |                    |                                        |
+|  +----------------------------------+  |                    | +------------------------------------+ |
+|  | Send the BIOS capability  Support|  |--------KCS-------->| |1.Get the complete atttributes data | |
+|  | Send the compressed BIOS file(or)|  |-MCTP/KCS/Redfish-->| |2.Validate and convert into         | |
+|  | Send PLDM data via MCTP  (or)    |  |                    | |  native to D-bus format.           | |
+|  | Send the Redfish host interface  |  |                    | |3.Expose the D-bus interface        | |
+|  +----------------------------------+  |                    | +------------------------------------+ |
+|                                        |                    |                                        |
+|                                        |                    | +------------------------------------+ |
+|                                        |                    | |PLDM can send complete all tables   | |
+|                                        |                    | | & send the native to D-bus format  | |
+|                                        |                    | | by Setting AllBaseAttributes       | |
+|                                        |                    | +------------------------------------+ |
+|                                        |                    | +------------------------------------+ |
+|                                        |                    | | If attribute  value changed then   | |
+|                                        |                    | | Biosconfig send signal to PLDM.    | |
+|                                        |                    | | PLDM read Pending attributes table | |
+|                                        |                    | | PLDM send the message to the host  | |
+|                                        |                    | | PLDM send the data to the host     | |
+|                                        |                    | +------------------------------------+ |
+|  +----------------------------------+  |                    | +------------------------------------+ |
+|  | Read the new Atributes value     |<-|----------------------| Send new Pending attributes table  | |
+|  |           and                    |  |                    | |                                    | |
+|  | Update in the BIOS structure     |  |                    | +------------------------------------+ |
+|  +---------------+------------------+  |                    |                                        |
+|                  |                     |                    |                                        |
+|                  YES                   |                    |                                        |
+|                  |                     |                    | +-----------------------------------+  |
+|   +--------------V------------------+  |                    | | Update the BIOS atrributes data.  |  |
+|   |  Send the updated data to BMC   |  |                    | | Discard the Pending attributes    |  |
+|   |                                 |------------------------>|                        table      |  |
+|   +---------------------------------+  |                    | +-----------------------------------+  |
+|                                        |                    |                                        |
++----------------------------------------+                    +----------------------------------------+
+```
+RBC should create the Pending Attribute list whenever SetPendingAttributes &
+SetAttribute Method called and raise the PendingAttributesUpdated signal.
+RBC should preserve the Pending Attributes list across the BMC reset and
+RBC should clear the Pending Attributes list whenever new AllBaseBIOSTables
+received from BIOS.
+
+
+#Redfish interfaces for remote Bios configuration
+
+```
+ +-----------------------------------------------------------------------------------------------------------+
+ | +-------------------------+             +----------------------------------------------------------------+|
+ | | RBC Web tool - POSTMAN  |             |   BMC                                                          ||
+ | |  (Please refer the      |             |  +-----------------------+       +---------------------------+ ||
+ | |   below redfish example |             |  |Redfish Daemon         |       |RBC Daemon Manager         | ||
+ | |   for each request)     |             |  |-Responsible for handle|       |-Parse Bios Data,convert to| ||
+ | |                         |             |  |all Redfish request    |       | required format & return  | ||
+ | |                         |             |  +-----------------------+       +---------------------------+ ||
+ | +-------------------------+             |  +-----------------------+       +---------------------------+ ||
+ | |                         |             |  |                       |       |                           | ||
+ | |1.Get Current attributes |<---Req-/Res--> | Read AllBaseAttributes|<-dbus-| AllBaseAttributes         | ||
+ | |   name & value list     |             |  |                       |       |                           | ||
+ | |                         |             |  |                       |       |                           | ||
+ | |2.Get Attribute Registry |<---Req-/Res--> | Read AllBaseAttributes|<-dbus-| AllBaseAttributes         | ||
+ | |                         |             |  |                       |       |                           | ||
+ | |3.Change BIOS Password   |<---Req-/Res--> | Call RBC D-bus Method |-dbus->| ChangePassword()          | ||
+ | |                         |             |  |                       |       |                           | ||
+ | |4.Reset To default       |<---Req-/Res--> | Call RBC D-bus Method |-dbus->| ResetBiosSettings()       | ||
+ | |            settings     |             |  |                       |       |     -ResetFlag            | ||
+ | |5.Update new BIOS setting|<---Req-/Res--->| Call RBC D-bus Method |-dbus->| SetAttribute()            | ||
+ | |  (For single attribute) |             |  |                       |       |                           | ||
+ | |                         |             |  |                       |       |                           | ||
+ | |6.Get Pending attributes |<---Req-/Res--->| Call RBC D-bus Method |<-dbus-| GetPendingAttributes()    | ||
+ | |           list          |             |  |                       |       |                           | ||
+ | |7.Update new BIOS setting|<---Req-/Res--->| Call RBC D-bus Method |<-dbus-| SetPendingAttributes()    | ||
+ | |           list          |             |  |                       |       |                           | ||
+ | |  For multiple attributes|             |  |                       |       |                           | ||
+ | +-------------------------+             |  +-----------------------+       +---------------------------+ ||
+ |                                         +---------------------------------------------------------------+||
+ +-----------------------------------------+-----------------------------------------------------------------+
+```
+1. Get Current Attributes name and value list:
+   Get the current BIOS settings attribute name and value pair list.
+   GET Method - "https://<BMC IP address>/redfish/v1/Systems/system/Bios"
+
+2. Get Attribute Registry:
+   Get the detailed information about Bios Attribute like current value,
+   supported value, description, Menupath, Default value.
+   GET Method - "https://<BMC IP address>/redfish/v1/Registries/Bios"
+
+3. Change BIOS password:
+   ACTION - "https://<BMC IP address>/redfish/v1/Systems/system/Bios/Actions/Bios.ChangePassword"
+
+4. Reset To default settings:
+   ACTION - "https://<BMC IP address>/redfish/v1/Systems/system/Bios/Actions/Bios.ResetBios"
+
+5. Update new BIOS settings (single attribute):
+   Use to send the new value for particular attribute or list of attributes.
+   PATCH Method - "https://<BMC IP address>/redfish/v1/Systems/system/Bios/Settings"
+  Ex:
+    Attribute name and new value : { "DdrFreqLimit" : 2400}
+
+6. Get the new pending value list:
+   Use to get the new pending attributes list.
+   GET Method - "https://<BMC IP address>/redfish/v1/Systems/system/Bios/Settings"
+   -Valid only in deferred model. For immediate update model, It will be empty.
+   Ex:
+    Attribute name and new value : { "DdrFreqLimit" : 2400,"QuietBoot",0x1 }
+
+7. Update new BIOS settings (multiple attributes):
+   Use to send the new value for particular attribute or list of attributes.
+   PATCH Method - "https://<BMC IP address>/redfish/v1/Systems/system/Bios/Settings"
+  Ex:
+    Attribute name and new value list : { "DdrFreqLimit" : 2400},"QuietBoot",0x1 }
+
+## Alternatives Considered
+Redfish Host specification definition is not completed and ready BIOS support
+also not available.
+There are 1000+ BIOS variables and storing in phosphor-settingsd is not optimal.
+
+## Impacts
+BIOS must support and follow RBC BIOS configuration flow.
+
+## Testing
+Able to change the BIOS configuration via BMC through LAN
+Able to change the BIOS setup password via BMC
+Compliance with Redfish will be tested using the Redfish Service Validator