d65e8da92e
This patch determines the A/B-specific bootloader message structure that is the basis for implementation of recovery and A/B update functions. A/B metadata is stored in this structure and used to decide which slot should we use to boot the device. Also some basic functions for A/B metadata manipulation are implemented (like slot selection). The patch was extracted from commits [1], [2] with some coding style fixes. [1] https://android-review.googlesource.com/c/platform/external/u-boot/+/729878/2 [2] 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: Sam Protsenko <semen.protsenko@linaro.org> Reviewed-by: Simon Glass <sjg@chromium.org>
35 lines
1.1 KiB
C
35 lines
1.1 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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#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 BOOT_SLOT_NAME(slot_num) ('a' + (slot_num))
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/* Number of slots */
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#define NUM_SLOTS 2
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/**
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* Select the slot where to boot from.
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*
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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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* @param[in] dev_desc Place to store the device description pointer
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* @param[in] part_info Place to store the partition information
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* @return The slot number (>= 0) on success, or a negative on error
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*/
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int ab_select_slot(struct blk_desc *dev_desc, disk_partition_t *part_info);
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#endif /* __ANDROID_AB_H */
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