[U-Boot] [PATCH 0/5] Use Android DT image format for TI boards

[Andrew F. Davis]

On 04/16/2018 03:32 PM, Sam Protsenko wrote:
> Android documentation recommends using new image format for storing dtb
> and dtbo files: [1]. Using that format, we can pack several dtb files to
> dtb.img, and also pack several dtbo files to dtbo.img. Then those images
> should be flashed to eMMC partitions, called "dtb" and "dtbo"
> respectively.
> 


I'm not convinced adding yet another one-off Android specific partition
format is what we need right now. With FIT images this is a solved
problem, why does Android need to go down a different path here?


> This patch series introduces support for mentioned Android DT image
> format, adds "dtimg" command to deal with that image format from U-Boot
> shell, and provides new Android boot scheme to TI boards (AM57x and DRA7
> boards). So with this patch series we will have next procedure for
> Android boot:
>  1. Read next images from eMMC partitions to RAM:
>     - boot.img
>     - dtb.img
>     - dtbo.img
>  2. Take addresses of desired dtb/dtbo files from that images (for
>     current board)
>  3. Apply dtbo overlays to main dtb, if needed
>  4. Boot the kernel from Android boot image, using resulting dtb
> 


All the above logic ends up adding more to our environment scripting at
a time when we are working to reduce that..

Andrew


> It was tested on X15 and AM57x EVM boards.
> 
> [1] https://source.android.com/devices/architecture/dto/partitions
> 
> Sam Protsenko (5):
>   common: Add support for Android DT image
>   cmd: Add dtimg command
>   arm: ti: boot: Extract PARTS_DEFAULT to boot.h
>   arm: ti: boot: Add dtbo partition for Android boot
>   arm: ti: boot: Implement Android boot using DT image format
> 
>  board/ti/common/Kconfig           |   1 +
>  cmd/Kconfig                       |   8 ++
>  cmd/Makefile                      |   1 +
>  cmd/dtimg.c                       | 142 ++++++++++++++++++++++++++++++
>  common/Makefile                   |   4 +
>  common/image-android-dt.c         | 134 ++++++++++++++++++++++++++++
>  configs/am57xx_evm_defconfig      |   1 +
>  configs/am57xx_hs_evm_defconfig   |   1 +
>  configs/dra7xx_evm_defconfig      |   1 +
>  configs/dra7xx_hs_evm_defconfig   |   1 +
>  include/configs/am57xx_evm.h      |  25 ------
>  include/configs/cl-som-am57x.h    |   2 +
>  include/configs/cm_t54.h          |   2 +
>  include/configs/dra7xx_evm.h      |  25 ------
>  include/configs/ti_armv7_common.h |   1 +
>  include/dt_table.h                |  46 ++++++++++
>  include/environment/ti/boot.h     |  68 ++++++++++++--
>  include/image-android-dt.h        |  18 ++++
>  18 files changed, 422 insertions(+), 59 deletions(-)
>  create mode 100644 cmd/dtimg.c
>  create mode 100644 common/image-android-dt.c
>  create mode 100644 include/dt_table.h
>  create mode 100644 include/image-android-dt.h
>