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The android_bootloader_control struct defined in bootloader_message.h stored the A/B metadata used to decide which slot should we use to boot the device. This patch implements the bootloader side of the slot selection in a new "android_ab_select" command which decides the current slot and updates the metadata as needed. Bug: 32707546 Test: Booted a rpi3, updated to the other slot. Change-Id: I9344ff5b76194160d2b466a50e84f4f423b1a98a
31 lines
1.1 KiB
C
31 lines
1.1 KiB
C
/*
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* Copyright (C) 2017 The Android Open Source Project
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#ifndef __ANDROID_AB_H
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#define __ANDROID_AB_H
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#include <common.h>
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/* Android standard boot slot names are 'a', 'b', 'c', ... */
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#define ANDROID_BOOT_SLOT_NAME(slot_num) ('a' + (slot_num))
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/** android_ab_select - Select the slot where to boot from.
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* On Android devices with more than one boot slot (multiple copies of the
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* kernel and system images) selects which slot should be used to boot from and
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* registers the boot attempt. This is used in by the new A/B update model where
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* one slot is updated in the background while running from the other slot. If
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* the selected slot did not successfully boot in the past, a boot attempt is
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* registered before returning from this function so it isn't selected
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* indefinitely.
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*
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* @dev_desc: Place to store the device description pointer.
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* @part_info: Place to store the partition information.
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* @return the slot number (0-based) on success, or -1 on error.
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*/
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int android_ab_select(struct blk_desc *dev_desc, disk_partition_t *part_info);
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#endif
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