mtk-preloader/platform/common/inc/bootimg.h

/* Copyright Statement:
 *
 * This software/firmware and related documentation ("MediaTek Software") are
 * protected under relevant copyright laws. The information contained herein
 * is confidential and proprietary to MediaTek Inc. and/or its licensors.
 * Without the prior written permission of MediaTek inc. and/or its licensors,
 * any reproduction, modification, use or disclosure of MediaTek Software,
 * and information contained herein, in whole or in part, shall be strictly prohibited.
 */

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#ifndef __BOOTIMG_H__
#define __BOOTIMG_H__

#include <pal_typedefs.h>

#define BOOTIMG_MAGIC    "ANDROID!"
#define BOOTIMG_MAGIC_SZ (8)
#define BOOTIMG_NAME_SZ  (16)
#define BOOTIMG_ARGS_SZ  (512)

#define BOOTIMG_HDR_SZ   (0x800)

/*
 ** +-----------------+
 ** | boot header     | 1 page
 ** +-----------------+
 ** | kernel          | n pages
 ** +-----------------+
 ** | ramdisk         | m pages
 ** +-----------------+
 ** | second stage    | o pages
 ** +-----------------+
 **
 ** n = (kernel_size + page_size - 1) / page_size
 ** m = (ramdisk_size + page_size - 1) / page_size
 ** o = (second_size + page_size - 1) / page_size
 **
 ** 0. all entities are page_size aligned in flash
 ** 1. kernel and ramdisk are required (size != 0)
 ** 2. second is optional (second_size == 0 -> no second)
 ** 3. load each element (kernel, ramdisk, second) at
 **    the specified physical address (kernel_addr, etc)
 ** 4. prepare tags at tag_addr.  kernel_args[] is
 **    appended to the kernel commandline in the tags.
 ** 5. r0 = 0, r1 = MACHINE_TYPE, r2 = tags_addr
 ** 6. if second_size != 0: jump to second_addr
 **    else: jump to kernel_addr
 */

struct bootimg_hdr
{
	uint8_t  magic[BOOTIMG_MAGIC_SZ];
	uint32_t kernel_sz;  /* size in bytes */
	uint32_t kernel_addr;  /* physical load addr */
	uint32_t ramdisk_sz; /* size in bytes */
	uint32_t ramdisk_addr; /* physical load addr */
	uint32_t second_sz;  /* size in bytes */
	uint32_t second_addr;  /* physical load addr */
	uint32_t tags_addr;    /* physical addr for kernel tags */
	uint32_t page_sz;    /* flash page size we assume */
	uint32_t unused;       /* future expansion: should be 0 */
	uint32_t os_version;
	char name[BOOTIMG_NAME_SZ]; /* asciiz product name */
	char cmdline[BOOTIMG_ARGS_SZ];
	uint32_t id[8]; /* timestamp / checksum / sha1 / etc */
};

#endif /* __BOOTIMG_H__ */