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-# bios-settings-mgr
+# Remote BIOS Configuration
 
-Remote BIOS Configuration via BMC Overview Provides ability for the user to view
-and modify the BIOS setup configuration parameters remotely via BMC at any Host
-state. Modifications to the parameters take place upon the next system reboot or
-immediate based on the host firmware. Please refer
-<https://github.com/openbmc/docs/blob/master/designs/remote-bios-configuration.md>
+[![License](https://img.shields.io/badge/license-Apache%202.0-blue.svg)](LICENSE)
 
-Remote BIOS Configuration (RBC) service exposes D-Bus methods for BIOS settings
-management operations.
+## Overview
 
-RBC Manager Interface xyz.openbmc_project.BIOSConfig.Manager provides following
-methods, properties.
+The **biosconfig_manager** service enables users to view and modify the BIOS
+setup configuration parameters remotely through the Baseboard Management
+Controller (BMC) at any host state. Changes to these parameters will take effect
+upon the next system reboot or immediately, depending on the host firmware.
 
-Object Path : /xyz/openbmc_project/BIOSConfig/Manager
+For more details, please refer to [design document][rbmc-design-document].
 
-xyz.openbmc_project.BIOSConfig.Manager
+## Features
 
-methods: SetAttribute -To set the particular BIOS attribute with new value.
-GetAttribute -To get the bios attribute current values and pending values if
-again.
+- **Remote management** of BIOS settings.
+- **Immediate updates** or scheduled changes upon reboot.
+- **Reset BIOS Settings** support through the dbus.
+- **ChangePassword** support to change the BIOS setup password.
 
-Properties: ResetBIOSSettings - Contain reset BIOS setting type: Interface have
-to set NoAction this property, when Reset BIOS settings are informed to the
-BIOS. BaseBIOSTable - Save the whole BIOS table.
-map{attributeName,struct{attributeType,readonlyStatus,displayname,
-description,menuPath,current,default, array{struct{optionstring,optionvalue}}}}
-Example 1: {"DdrFreqLimit",
-{xyz.openbmc_project.BIOSConfig.Manager.AttributeType.String, false, "Memory
-Operating Speed Selection", "Force specific Memory Operating Speed or use Auto
-setting.", "Advanced/Memory Configuration/Memory Operating Speed Selection",
-"0x00", "0x0B", { {"OneOf", "auto"}, {"OneOf", "2133"}, {"OneOf", "2400"},
-{"OneOf", "2664"}, {"OneOf", "2933"} } } } Example 2: {"BIOSSerialDebugLevel",
-{xyz.openbmc_project.BIOSConfig.Manager.AttributeType.Integer, false, "BIOS
-Serial Debug level", "BIOS Serial Debug level during system boot.",
-"Advanced/Debug Feature Selection", 0x00, 0x01, { {"MinBound", 0}, {"MaxBound",
-4}, {"ScalarIncrement",1} } } }
+## RBC Manager Interface
 
-Signals: AttributeChanged - Signal sent out when attribute is changed
+The Manager interface exposes methods and properties to Get & Set BIOS
+attributes via dbus and its documented [here][pdi-manager-bios]
 
-PasswordInterface:
+### Object Path
 
-xyz.openbmc_project.BIOSConfig.Password provides following Methods and
-Properties.
+```txt
+/xyz/openbmc_project/BIOSConfig/Manager
+```
 
-xyz.openbmc_project.BIOSConfig.Password Interface
+### Methods
 
-Methods: ChangePassword - Change the BIOS setup password.
+- **SetAttribute** Sets a specific BIOS attribute to a new value.
+- **GetAttribute** Retrieves the current and pending values of a BIOS attribute.
 
-Properties: PasswordInitialized - To indicate BIOS password related details are
-received or not.
+### Properties
+
+- **ResetBIOSSettings** To reset the BIOS settings based on the Reset Flag.
+- **BaseBIOSTable** Captures the entire BIOS table (collective information of
+  all the BIOS attributes and their properties)
+
+## Signature of `BaseBIOSTable`
+
+The `BaseBIOSTable` property in the RBC Manager Interface is a complex
+dictionary that defines the structure of BIOS attributes. Its type signature is
+as follows:
+
+```plaintext
+dict[string, struct[
+    enum[self.AttributeType],
+    boolean,
+    string,
+    string,
+    string,
+    variant[int64, string],
+    variant[int64, string],
+    array[struct[enum[self.BoundType], variant[int64, string], string]]
+]]
+```
+
+This structure consists of:
+
+- **Attribute Name (string)**: The name of the BIOS attribute.
+- **Attribute Type (enum)**: The type of the BIOS attribute (e.g., String,
+  Integer).
+- **Read-only Status (boolean)**: Whether the attribute is read-only.
+- **Display Name (string)**: The human-readable name of the attribute.
+- **Description (string)**: A description of what the attribute does.
+- **Menu Path (string)**: The BIOS menu path where this attribute can be found.
+- **Current Value (variant[int64, string])**: The current value of the attribute.
+- **Default Value (variant[int64, string])**: The default value of the attribute.
+- **Options (array of structs)**: The available options or bounds for this
+  attribute.
+
+### Examples
+
+Here is an example json structure of a `String` attribute with `attributeName`
+`DrdFreqLimit` & its various properties in BaseBIOSTable signature.
+
+```json
+{
+  "DdrFreqLimit": {
+    "attributeType": "xyz.openbmc_project.BIOSConfig.Manager.AttributeType.String",
+    "readonlyStatus": false,
+    "displayname": "Memory Operating Speed Selection",
+    "description": "Force specific Memory Operating Speed or use Auto setting.",
+    "menuPath": "Advanced/Memory Configuration/Memory Operating Speed Selection",
+    "current": "0x00",
+    "default": "0x0B",
+    "options": [
+      { "optionstring": "auto", "optionvalue": "enum0" },
+      { "optionstring": "2133", "optionvalue": "enum1" },
+      { "optionstring": "2400", "optionvalue": "enum2" },
+      { "optionstring": "2664", "optionvalue": "enum3" },
+      { "optionstring": "2933", "optionvalue": "enum4" }
+    ]
+  }
+}
+```
+
+Here is another example json structure of a `Integer` attribute with attribute
+with name `BIOSSerialDebugLevel` & its various properties in BaseBIOSTable
+signature.
+
+```json
+{
+  "BIOSSerialDebugLevel": {
+    "attributeType": "xyz.openbmc_project.BIOSConfig.Manager.AttributeType.Integer",
+    "readonlyStatus": false,
+    "displayname": "BIOS Serial Debug level",
+    "description": "BIOS Serial Debug level during system boot.",
+    "menuPath": "Advanced/Debug Feature Selection",
+    "current": 0x00,
+    "default": 0x01,
+    "options": [
+      { "optionstring": "MinBound", "optionvalue": 0 },
+      { "optionstring": "MaxBound", "optionvalue": 4 },
+      { "optionstring": "ScalarIncrement", "optionvalue": 1 }
+    ]
+  }
+}
+```
+
+## Initialization of `BaseBIOSTable`
+
+When the `bios-settings-mgr` daemon starts, it initializes with an empty
+`BaseBIOSTable`. It is the responsibility of provider daemons, such as **PLDM**
+or **IPMI**, to populate this table by fetching or defining the BIOS settings.
+These provider daemons are expected to gather the necessary BIOS attributes and
+values from their respective sources (ex: bmc, system firmware) and then
+initialize the `BaseBIOSTable` property with those settings.
+
+### BIOS with PLDM as Communication Protocol
+
+For systems that use the **PLDM (Platform Level Data Model)** protocol between
+BMC & Host, OEM vendors can define their own BIOS attributes in the form of
+[JSON files][pldm-bios-json]. The PLDM daemon parses these files and initializes
+the `BaseBIOSTable` property accordingly. This allows for flexible and custom
+BIOS configuration options based on the vendor's specifications.
+
+For more details , refer to the [BIOS Support in PLDM][pldm-bios].
+
+### BIOS with IPMI as Communication Protocol
+
+For systems that use the **Intelligent Platform Management Interface** protocol
+between BMC & Host, BIOS attributes are gathered from BIOS as an `xml file` &
+`BaseBIOSTable` would then be initialized with the attributes data from the
+parsed xml file.
+
+For more details, refer to the code [BIOS Support in IPMI][ipmi-intel-bios].
+
+## RBC Password Interface
+
+### Object Path
+
+```txt
+xyz.openbmc_project.BIOSConfig.Password
+```
+
+### Methods
+
+- **ChangePassword**  
+  Used to change the BIOS setup password.
+
+### Properties
+
+- **PasswordInitialized** Used to indicate whether the BIOS password-related
+  details have been received.
+
+[rbmc-design-document]:
+  https://github.com/openbmc/docs/blob/master/designs/remote-bios-configuration.md
+[pldm-bios-json]:
+  https://github.com/openbmc/pldm/blob/master/oem/ibm/configurations/bios/com.ibm.Hardware.Chassis.Model.Rainier2U/bios_attrs.json
+[pldm-bios]: https://github.com/openbmc/pldm?tab=readme-ov-file#bios-support
+[ipmi-intel-bios]:
+  https://github.com/openbmc/intel-ipmi-oem/blob/master/src/biosconfigcommands.cpp
+[pdi-manager-bios]:
+  https://github.com/openbmc/phosphor-dbus-interfaces/blob/master/yaml/xyz/openbmc_project/BIOSConfig/Manager.interface.yaml