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=152508418909737=2
Signed-off-by: Sam Protsenko
---
Changes in v3:
- clear BCB on boot-recovery for now, as it's not implemented yet
Changes in v2:
- use CONTROL_PARTITION instead of "misc" to avoid hard code
- add proper indentation
include/environment/ti/boot.h | 29 +++--
1 file changed, 27 insertions(+), 2 deletions(-)
diff --git a/include/environment/ti/boot.h b/include/environment/ti/boot.h
index e55a4aec57..684a744f31 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 +121,28 @@
"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;"\
--
2.20.1
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