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env: ti: boot: Handle reboot reason from BCB

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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>
This commit is contained in:
Sam Protsenko 2019-07-25 16:20:41 +03:00 committed by Tom Rini
parent a239147fa2
commit 3db0989e68
1 changed files with 27 additions and 2 deletions
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29
include/environment/ti/boot.h
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@ -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 +121,28 @@
"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...; " \
"bcb clear command; bcb store; " \
"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 +202,7 @@
"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;" \