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17030c7c4c
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>
53 lines
1.7 KiB
C
53 lines
1.7 KiB
C
// SPDX-License-Identifier: BSD-2-Clause
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/*
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* Copyright (C) 2017 The Android Open Source Project
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*/
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#include <android_ab.h>
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#include <command.h>
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static int do_ab_select(cmd_tbl_t *cmdtp, int flag, int argc,
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char * const argv[])
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{
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int ret;
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struct blk_desc *dev_desc;
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disk_partition_t part_info;
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char slot[2];
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if (argc != 4)
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return CMD_RET_USAGE;
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/* Lookup the "misc" partition from argv[2] and argv[3] */
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if (part_get_info_by_dev_and_name_or_num(argv[2], argv[3],
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&dev_desc, &part_info) < 0) {
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return CMD_RET_FAILURE;
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}
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ret = ab_select_slot(dev_desc, &part_info);
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if (ret < 0) {
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printf("Android boot failed, error %d.\n", ret);
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return CMD_RET_FAILURE;
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}
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/* Android standard slot names are 'a', 'b', ... */
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slot[0] = BOOT_SLOT_NAME(ret);
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slot[1] = '\0';
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env_set(argv[1], slot);
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printf("ANDROID: Booting slot: %s\n", slot);
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return CMD_RET_SUCCESS;
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}
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U_BOOT_CMD(ab_select, 4, 0, do_ab_select,
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"Select the slot used to boot from and register the boot attempt.",
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"<slot_var_name> <interface> <dev[:part|#part_name]>\n"
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" - Load the slot metadata from the partition 'part' on\n"
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" device type 'interface' instance 'dev' and store the active\n"
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" slot in the 'slot_var_name' variable. This also updates the\n"
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" Android slot metadata with a boot attempt, which can cause\n"
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" successive calls to this function to return a different result\n"
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" if the returned slot runs out of boot attempts.\n"
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" - If 'part_name' is passed, preceded with a # instead of :, the\n"
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" partition name whose label is 'part_name' will be looked up in\n"
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" the partition table. This is commonly the \"misc\" partition.\n"
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);
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