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cmd: bcb: Expose 'bcb_write_reboot_reason' to external callers

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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>
[lukma - added missing #include <linux/errno.h> to avoid build breaks]
This commit is contained in:
Eugeniu Rosca 2020-10-23 11:52:22 +03:00 committed by Marek Vasut
parent e2ffb3be49
commit e74670adfe
2 changed files with 41 additions and 0 deletions
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20
cmd/bcb.c
View file

@ -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, "", ""),

21
include/bcb.h Normal file
View file

@ -0,0 +1,21 @@
// 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
#include <linux/errno.h>
static inline int bcb_write_reboot_reason(int devnum, char *partp, char *reasonp)
{
return -EOPNOTSUPP;
}
#endif
#endif /* __BCB_H__ */