On Fri, Jul 12, 2019 at 8:35 PM Sam Protsenko semen.protsenko@linaro.org wrote:

In case of Android boot, reboot reason can be written into BCB (usually it's an area in 'misc' partition). U-Boot then can obtain that reboot reason from BCB and handle it accordingly to achieve correct Android boot flow, like it was suggested in [1]:

• if it's empty: perform normal Android boot from eMMC
• if it contains "bootonce-bootloader": get into fastboot mode
• if it contains "boot-recovery": perform recovery boot

The latter is not implemented yet, as it depends on some features that are not implemented on TI platforms yet (in AOSP and in U-Boot).

[1] https://marc.info/?l=u-boot&m=152508418909737&w=2

Signed-off-by: Sam Protsenko semen.protsenko@linaro.org

Superseded by v3.

Changes in v2:

• use CONTROL_PARTITION instead of "misc" to avoid hard code
• add proper indentation

include/environment/ti/boot.h | 28 ++++++++++++++++++++++++++-- 1 file changed, 26 insertions(+), 2 deletions(-)

diff --git a/include/environment/ti/boot.h b/include/environment/ti/boot.h index 54e9b2de4d..01b2981c5b 100644 --- a/include/environment/ti/boot.h +++ b/include/environment/ti/boot.h @@ -98,6 +98,10 @@ #define AB_SELECT "" #endif

+#define FASTBOOT_CMD \

•   "echo Booting into fastboot ...; " \
  

•   "fastboot " __stringify(CONFIG_FASTBOOT_USB_DEV) "; "
  

#define DEFAULT_COMMON_BOOT_TI_ARGS \ "console=" CONSOLEDEV ",115200n8\0" \ "fdtfile=undefined\0" \ @@ -117,6 +121,27 @@ "setenv mmcroot /dev/mmcblk0p2 rw; " \ "run mmcboot;\0" \ "emmc_android_boot=" \

•           "if bcb load " __stringify(CONFIG_FASTBOOT_FLASH_MMC_DEV) " " \
  

•           CONTROL_PARTITION "; then " \
  

•                   "if bcb test command = bootonce-bootloader; then " \
  

•                           "echo BCB: Bootloader boot...; " \
  

•                           "bcb clear command; bcb store; " \
  

•                           FASTBOOT_CMD \
  

•                   "elif bcb test command = boot-recovery; then " \
  

•                           "echo BCB: Recovery boot...; " \
  

•                           "echo Warning: recovery is not implemented; " \
  

•                           "echo Performing normal boot for now...; " \
  

•                           "run emmc_android_normal_boot; " \
  

•                   "else " \
  

•                           "echo BCB: Normal boot requested...; " \
  

•                           "run emmc_android_normal_boot; " \
  

•                   "fi; " \
  

•           "else " \
  

•                   "echo Warning: BCB is corrupted or does not exist; " \
  

•                   "echo Performing normal boot...; " \
  

•                   "run emmc_android_normal_boot; " \
  

•           "fi;\0" \
  

•   "emmc_android_normal_boot=" \
            "echo Trying to boot Android from eMMC ...; " \
            "run update_to_fit; " \
            "setenv eval_bootargs setenv bootargs $bootargs; " \
  

@@ -176,8 +201,7 @@ "if test ${dofastboot} -eq 1; then " \ "echo Boot fastboot requested, resetting dofastboot ...;" \ "setenv dofastboot 0; saveenv;" \

•           "echo Booting into fastboot ...; " \
  

•           "fastboot " __stringify(CONFIG_FASTBOOT_USB_DEV) "; " \
  

•           FASTBOOT_CMD \
    "fi;" \
    "if test ${boot_fit} -eq 1; then "      \
            "run update_to_fit;"    \
  

-- 2.20.1