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 > _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de https://lists.denx.de/listinfo/u-boot
