1 /* 2 * This is from the Android Project, 3 * Repository: https://android.googlesource.com/platform/bootable/bootloader/legacy 4 * File: include/boot/bootimg.h 5 * Commit: 4205b865141ff2e255fe1d3bd16de18e217ef06a 6 * 7 * Copyright (C) 2008 The Android Open Source Project 8 * 9 * SPDX-License-Identifier: BSD-2-Clause 10 */ 11 12 #ifndef _ANDROID_IMAGE_H_ 13 #define _ANDROID_IMAGE_H_ 14 15 #define ANDR_BOOT_MAGIC "ANDROID!" 16 #define ANDR_BOOT_MAGIC_SIZE 8 17 #define ANDR_BOOT_NAME_SIZE 16 18 #define ANDR_BOOT_ARGS_SIZE 512 19 20 struct andr_img_hdr { 21 char magic[ANDR_BOOT_MAGIC_SIZE]; 22 23 u32 kernel_size; /* size in bytes */ 24 u32 kernel_addr; /* physical load addr */ 25 26 u32 ramdisk_size; /* size in bytes */ 27 u32 ramdisk_addr; /* physical load addr */ 28 29 u32 second_size; /* size in bytes */ 30 u32 second_addr; /* physical load addr */ 31 32 u32 tags_addr; /* physical addr for kernel tags */ 33 u32 page_size; /* flash page size we assume */ 34 u32 unused[2]; /* future expansion: should be 0 */ 35 36 char name[ANDR_BOOT_NAME_SIZE]; /* asciiz product name */ 37 38 char cmdline[ANDR_BOOT_ARGS_SIZE]; 39 40 u32 id[8]; /* timestamp / checksum / sha1 / etc */ 41 }; 42 43 /* 44 * +-----------------+ 45 * | boot header | 1 page 46 * +-----------------+ 47 * | kernel | n pages 48 * +-----------------+ 49 * | ramdisk | m pages 50 * +-----------------+ 51 * | second stage | o pages 52 * +-----------------+ 53 * 54 * n = (kernel_size + page_size - 1) / page_size 55 * m = (ramdisk_size + page_size - 1) / page_size 56 * o = (second_size + page_size - 1) / page_size 57 * 58 * 0. all entities are page_size aligned in flash 59 * 1. kernel and ramdisk are required (size != 0) 60 * 2. second is optional (second_size == 0 -> no second) 61 * 3. load each element (kernel, ramdisk, second) at 62 * the specified physical address (kernel_addr, etc) 63 * 4. prepare tags at tag_addr. kernel_args[] is 64 * appended to the kernel commandline in the tags. 65 * 5. r0 = 0, r1 = MACHINE_TYPE, r2 = tags_addr 66 * 6. if second_size != 0: jump to second_addr 67 * else: jump to kernel_addr 68 */ 69 #endif 70