[J-u-boot.git] / include / android_ab.h

/* SPDX-License-Identifier: BSD-2-Clause */
/*
 * Copyright (C) 2017 The Android Open Source Project
 */

#ifndef __ANDROID_AB_H
#define __ANDROID_AB_H

#include <common.h>

/* Android standard boot slot names are 'a', 'b', 'c', ... */
#define BOOT_SLOT_NAME(slot_num) ('a' + (slot_num))

/* Number of slots */
#define NUM_SLOTS 2

/**
 * Select the slot where to boot from.
 *
 * On Android devices with more than one boot slot (multiple copies of the
 * kernel and system images) selects which slot should be used to boot from and
 * registers the boot attempt. This is used in by the new A/B update model where
 * one slot is updated in the background while running from the other slot. If
 * the selected slot did not successfully boot in the past, a boot attempt is
 * registered before returning from this function so it isn't selected
 * indefinitely.
 *
 * @param[in] dev_desc Place to store the device description pointer
 * @param[in] part_info Place to store the partition information
 * @return The slot number (>= 0) on success, or a negative on error
 */
int ab_select_slot(struct blk_desc *dev_desc, disk_partition_t *part_info);

#endif /* __ANDROID_AB_H */
Commit	Line	Data
d65e8da9 RT	1	/* SPDX-License-Identifier: BSD-2-Clause */
	2	/*
	3	* Copyright (C) 2017 The Android Open Source Project
	4	*/
	5
	6	#ifndef __ANDROID_AB_H
	7	#define __ANDROID_AB_H
	8
	9	#include <common.h>
	10
	11	/* Android standard boot slot names are 'a', 'b', 'c', ... */
	12	#define BOOT_SLOT_NAME(slot_num) ('a' + (slot_num))
	13
	14	/* Number of slots */
	15	#define NUM_SLOTS 2
	16
	17	/**
	18	* Select the slot where to boot from.
	19	*
	20	* On Android devices with more than one boot slot (multiple copies of the
	21	* kernel and system images) selects which slot should be used to boot from and
	22	* registers the boot attempt. This is used in by the new A/B update model where
	23	* one slot is updated in the background while running from the other slot. If
	24	* the selected slot did not successfully boot in the past, a boot attempt is
	25	* registered before returning from this function so it isn't selected
	26	* indefinitely.
	27	*
	28	* @param[in] dev_desc Place to store the device description pointer
	29	* @param[in] part_info Place to store the partition information
	30	* @return The slot number (>= 0) on success, or a negative on error
	31	*/
	32	int ab_select_slot(struct blk_desc dev_desc, disk_partition_t part_info);
	33
	34	#endif /* __ANDROID_AB_H */