aspeed: Build a wic image for the eMMC User Data Area

The U-Boot SPL and U-Boot proper would be programmed to the
Boot Area Hardware Partitions of the eMMC. The kernel and user
space would go into the User Data Area. This commit creates an
image that can be programmed into that User Data Area. Layout:

 --- - ----- -------- -------- ----- ------- ------ -------- -------
|GPT| | env | boot-a | boot-b | fs-a | fs-b | rwfs | hostfw |GPT-sec|
 --- - ----- -------- -------- ------ ------ ------ -------- -------
      ^ 1MB    64MB     64MB    1GB     1GB    7GB     5GB
      |
      0x5000

Primary GPT size (Beginning of image):
512B (Protective MBR) + 512B (Primary Header) + 16KB (Primary Table)
First partition (u-boot-env) is 4K-aligned, which puts it at offset 0x5000

Secondary GPT size (End of image):
16KB (Secondary Table) + 512B (Secondary Header)

Since the secondary GPT is expected to be at the end of the device,
the initramfs can issue a "sgdisk -e /dev/mmcblk0" on first boot
to move it to the end.

The first partition holds the U-Boot environment. The following two
partitions hold a filesystem with the fitImage file. Code update
would reflash the full filesystem with the fitImage during an update.

U-Boot can then be programmed to look for the kernel in partitions
boot-a or boot-b.

The remaining is a set of ext4 filesystems for user space, read-write,
and host firmware.

The size for the host firmware partition is configurable to be able
to build an image of different size. The reason is that the tacoma
system is has a User Data area just 1GB smaller than rainier.

Design doc: https://gerrit.openbmc-project.xyz/c/openbmc/docs/+/28443

Tested: Adding "WKS_HOSTFW_SIZE = "4G"" to the tacoma.conf file
        created a 14GB wic file:
$ ls -lh *wic
-rw-r--r-- 1 anoo 532919 15G Jul 14 08:18 obmc-phosphor-image-rainier.wic
-rw-r--r-- 1 anoo 532919 14G Jul 14 08:36 obmc-phosphor-image-witherspoon-tacoma.wi

$ wic ls obmc-phosphor-image-rainier.wic
Num     Start        End          Size      Fstype
...
 7    9798963200  15167672319   5368709120  ext4

$ wic ls obmc-phosphor-image-witherspoon-tacoma.wic
Num     Start        End          Size      Fstype
...
 7    9798963200  14093930495   4294967296  ext4

Change-Id: I37759760ac7baa42ab9d202f0926d4a31d0070ac
Signed-off-by: Adriana Kobylak <anoo@us.ibm.com>
2 files changed
tree: 71fc5171cb6ab4bac765bbc98edb9643701b9c56
  1. conf/
  2. recipes-aspeed/
  3. recipes-bsp/
  4. recipes-core/
  5. recipes-kernel/
  6. wic/
  7. COPYING.apache-2.0
  8. COPYING.MIT
  9. LICENSE
  10. MAINTAINERS
  11. README.md
README.md

OpenEmbedded/Yocto BSP layer for Aspeed's platforms

This layer provides support for Aspeed's platforms for use with OpenEmbedded and/or Yocto.

This layer depends on:

URI: git://git.openembedded.org/openembedded-core
layers: meta
branch: master
revision: HEAD

Contributing

meta-aspeed patches are reviewed using the Gerrit instance at https://gerrit.openbmc-project.xyz.

Please submit patches to Gerrit. More information on using Gerrit can be found here. https://github.com/openbmc/meta-aspeed is a hosting mirror only and GitHub pull requests are not monitored and will not be accepted.

Patch checklist. Please ensure patches adhere to the following guidelines:

For questions or help please come join us on the mailing list or in IRC.