From: Eugeniu Rosca erosca@de.adit-jv.com
Fastboot is evolving and beginning with commit [1], the upstream implementation expects bootloaders to offer support for: - reboot-recovery - reboot-fastboot
The most natural way to achieve the above is through a set of pre-defined "reboot reason" strings, written into / read from the BCB "command" field, e.g.: - bootonce-bootloader [2] - boot-fastboot [3] - boot-recovery [4]
Expose the first 'bcb' API meant to be called by e.g. fastboot stack, to allow updating the BCB reboot reason via the BCB 'command' field.
[1] https://android.googlesource.com/platform/system/core/+/dea91b4b5354af2 ("Add fastbootd.") [2] https://android.googlesource.com/platform/bootable/recovery/+/cba7fa88d8b9 ("Add 'reboot bootloader' to bootloader_message.") [3] https://android.googlesource.com/platform/bootable/recovery/+/eee4e260f9f6 ("recovery: Add "boot-fastboot" command to BCB.") [4] https://android.googlesource.com/platform/system/core/+/5e98b633a748695f ("init: Write the reason in BCB on "reboot recovery"")
Signed-off-by: Eugeniu Rosca erosca@de.adit-jv.com Signed-off-by: Roman Kovalivskyi roman.kovalivskyi@globallogic.com --- cmd/bcb.c | 20 ++++++++++++++++++++ include/bcb.h | 20 ++++++++++++++++++++ 2 files changed, 40 insertions(+) create mode 100644 include/bcb.h
diff --git a/cmd/bcb.c b/cmd/bcb.c index b9cd20ea3d56..5da3526142ad 100644 --- a/cmd/bcb.c +++ b/cmd/bcb.c @@ -6,6 +6,7 @@ */
#include <android_bootloader_message.h> +#include <bcb.h> #include <command.h> #include <common.h> #include <log.h> @@ -307,6 +308,25 @@ static int do_bcb_store(struct cmd_tbl *cmdtp, int flag, int argc, return __bcb_store(); }
+int bcb_write_reboot_reason(int devnum, char *partp, char *reasonp) +{ + int ret; + + ret = __bcb_load(devnum, partp); + if (ret != CMD_RET_SUCCESS) + return ret; + + ret = __bcb_set("command", reasonp); + if (ret != CMD_RET_SUCCESS) + return ret; + + ret = __bcb_store(); + if (ret != CMD_RET_SUCCESS) + return ret; + + return 0; +} + static struct cmd_tbl cmd_bcb_sub[] = { U_BOOT_CMD_MKENT(load, CONFIG_SYS_MAXARGS, 1, do_bcb_load, "", ""), U_BOOT_CMD_MKENT(set, CONFIG_SYS_MAXARGS, 1, do_bcb_set, "", ""), diff --git a/include/bcb.h b/include/bcb.h new file mode 100644 index 000000000000..9b662d1203a6 --- /dev/null +++ b/include/bcb.h @@ -0,0 +1,20 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Copyright (C) 2020 Eugeniu Rosca rosca.eugeniu@gmail.com + * + * Android Bootloader Control Block Header + */ + +#ifndef __BCB_H__ +#define __BCB_H__ + +#if CONFIG_IS_ENABLED(CMD_BCB) +int bcb_write_reboot_reason(int devnum, char *partp, char *reasonp); +#else +static inline int bcb_write_reboot_reason(int devnum, char *partp, char *reasonp) +{ + return -EOPNOTSUPP; +} +#endif + +#endif /* __BCB_H__ */