From: Ruslan Trofymenko ruslan.trofymenko@linaro.org
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/...
Signed-off-by: Ruslan Trofymenko ruslan.trofymenko@linaro.org Signed-off-by: Igor Opaniuk igor.opaniuk@linaro.org Reviewed-by: Alistair Strachan astrachan@google.com Reviewed-by: Sam Protsenko semen.protsenko@linaro.org --- Changes in v3: None Changes in v2: * 'android_ab_select' command is renamed to 'ab_select' command * command is moved to the separate 'Android support commands' menu
cmd/Kconfig | 15 +++++++++++++++ cmd/Makefile | 1 + cmd/ab_select.c | 52 ++++++++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 68 insertions(+) create mode 100644 cmd/ab_select.c
diff --git a/cmd/Kconfig b/cmd/Kconfig index 3ea42e4..290a570 100644 --- a/cmd/Kconfig +++ b/cmd/Kconfig @@ -1123,6 +1123,21 @@ 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 diff --git a/cmd/Makefile b/cmd/Makefile index 15ae4d2..ea03eb0 100644 --- a/cmd/Makefile +++ b/cmd/Makefile @@ -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 diff --git a/cmd/ab_select.c b/cmd/ab_select.c new file mode 100644 index 0000000..2a9e524 --- /dev/null +++ b/cmd/ab_select.c @@ -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] = ANDROID_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" +);