Sam Protsenko authored Jul 25, 2019 and Tom Rini committed Jul 31, 2019

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>