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cmd: Add 'ab_select' command

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For A/B system update support the Android boot process requires to send
'androidboot.slot_suffix' parameter as a command line argument. This
patch implementes 'ab_select' command which allows us to obtain current
slot by processing the A/B metadata.

The patch was extracted from commit [1] with one modification: the
separator for specifying the name of metadata partition was changed
from ';' to '#', because ';' is used for commands separation.

[1] https://android-review.googlesource.com/c/platform/external/u-boot/+/729880/2

Signed-off-by: Ruslan Trofymenko <ruslan.trofymenko@linaro.org>
Signed-off-by: Igor Opaniuk <igor.opaniuk@gmail.com>
Reviewed-by: Alistair Strachan <astrachan@google.com>
Reviewed-by: Sam Protsenko <semen.protsenko@linaro.org>
Reviewed-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Ruslan Trofymenko 2019-07-05 15:37:33 +03:00 committed by Tom Rini
parent d65e8da92e
commit 17030c7c4c
3 changed files with 68 additions and 0 deletions
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15
cmd/Kconfig
View File

@ -1198,6 +1198,21 @@ config CMD_SETEXPR
endmenu
menu "Android support commands"
config CMD_AB_SELECT
bool "ab_select"
default n
depends on ANDROID_AB
help
On Android devices with more than one boot slot (multiple copies of
the kernel and system images) this provides a command to select which
slot should be used to boot from and register the boot attempt. This
is used by the new A/B update model where one slot is updated in the
background while running from the other slot.
endmenu
if NET
menuconfig CMD_NET

1
cmd/Makefile
View File

@ -12,6 +12,7 @@ obj-y += version.o
# command
obj-$(CONFIG_CMD_AES) += aes.o
obj-$(CONFIG_CMD_AB_SELECT) += ab_select.o
obj-$(CONFIG_CMD_ADC) += adc.o
obj-$(CONFIG_CMD_ARMFLASH) += armflash.o
obj-y += blk_common.o

52
cmd/ab_select.c Normal file
View File

@ -0,0 +1,52 @@
// SPDX-License-Identifier: BSD-2-Clause
/*
* Copyright (C) 2017 The Android Open Source Project
*/
#include <android_ab.h>
#include <command.h>
static int do_ab_select(cmd_tbl_t *cmdtp, int flag, int argc,
char * const argv[])
{
int ret;
struct blk_desc *dev_desc;
disk_partition_t part_info;
char slot[2];
if (argc != 4)
return CMD_RET_USAGE;
/* Lookup the "misc" partition from argv[2] and argv[3] */
if (part_get_info_by_dev_and_name_or_num(argv[2], argv[3],
&dev_desc, &part_info) < 0) {
return CMD_RET_FAILURE;
}
ret = ab_select_slot(dev_desc, &part_info);
if (ret < 0) {
printf("Android boot failed, error %d.\n", ret);
return CMD_RET_FAILURE;
}
/* Android standard slot names are 'a', 'b', ... */
slot[0] = BOOT_SLOT_NAME(ret);
slot[1] = '\0';
env_set(argv[1], slot);
printf("ANDROID: Booting slot: %s\n", slot);
return CMD_RET_SUCCESS;
}
U_BOOT_CMD(ab_select, 4, 0, do_ab_select,
"Select the slot used to boot from and register the boot attempt.",
"<slot_var_name> <interface> <dev[:part|#part_name]>\n"
" - Load the slot metadata from the partition 'part' on\n"
" device type 'interface' instance 'dev' and store the active\n"
" slot in the 'slot_var_name' variable. This also updates the\n"
" Android slot metadata with a boot attempt, which can cause\n"
" successive calls to this function to return a different result\n"
" if the returned slot runs out of boot attempts.\n"
" - If 'part_name' is passed, preceded with a # instead of :, the\n"
" partition name whose label is 'part_name' will be looked up in\n"
" the partition table. This is commonly the \"misc\" partition.\n"
);