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@@ -0,0 +1,52 @@
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+// 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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+
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+#include <android_ab.h>
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+#include <command.h>
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+
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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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+
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+ if (argc != 4)
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+ return CMD_RET_USAGE;
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+
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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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+
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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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+
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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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+
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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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