d35ce3563b
We can't simply increase the value of BOOT_ARGS_SIZE since that would break past binary compatibility; the offset of 'id' would change. This can cause serious problems with incremental OTA updates. Instead, define a supplemental field which stores command line information beyond the first 512 bytes. A value of 1024 was chosen to keep the total size of struct boot_img_hdr under the smallest page size of 2048 bytes. Even if the extra_cmdline field is used, the original cmdline field is still always NULL-terminated to avoid issues with older bootloaders that haven't been updated. Change-Id: I887e6f1db351a5b71a61e3a03363cf8856123d74 Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>
102 lines
3 KiB
C
102 lines
3 KiB
C
/* tools/mkbootimg/bootimg.h
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**
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** Copyright 2007, The Android Open Source Project
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**
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** Licensed under the Apache License, Version 2.0 (the "License");
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** you may not use this file except in compliance with the License.
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** You may obtain a copy of the License at
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**
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** http://www.apache.org/licenses/LICENSE-2.0
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**
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** Unless required by applicable law or agreed to in writing, software
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** distributed under the License is distributed on an "AS IS" BASIS,
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** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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** See the License for the specific language governing permissions and
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** limitations under the License.
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*/
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#ifndef _BOOT_IMAGE_H_
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#define _BOOT_IMAGE_H_
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typedef struct boot_img_hdr boot_img_hdr;
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#define BOOT_MAGIC "ANDROID!"
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#define BOOT_MAGIC_SIZE 8
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#define BOOT_NAME_SIZE 16
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#define BOOT_ARGS_SIZE 512
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#define BOOT_EXTRA_ARGS_SIZE 1024
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struct boot_img_hdr
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{
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unsigned char magic[BOOT_MAGIC_SIZE];
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unsigned kernel_size; /* size in bytes */
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unsigned kernel_addr; /* physical load addr */
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unsigned ramdisk_size; /* size in bytes */
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unsigned ramdisk_addr; /* physical load addr */
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unsigned second_size; /* size in bytes */
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unsigned second_addr; /* physical load addr */
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unsigned tags_addr; /* physical addr for kernel tags */
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unsigned page_size; /* flash page size we assume */
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unsigned unused[2]; /* future expansion: should be 0 */
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unsigned char name[BOOT_NAME_SIZE]; /* asciiz product name */
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unsigned char cmdline[BOOT_ARGS_SIZE];
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unsigned id[8]; /* timestamp / checksum / sha1 / etc */
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/* Supplemental command line data; kept here to maintain
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* binary compatibility with older versions of mkbootimg */
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unsigned char extra_cmdline[BOOT_EXTRA_ARGS_SIZE];
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};
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/*
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** +-----------------+
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** | boot header | 1 page
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** +-----------------+
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** | kernel | n pages
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** +-----------------+
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** | ramdisk | m pages
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** +-----------------+
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** | second stage | o pages
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** +-----------------+
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**
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** n = (kernel_size + page_size - 1) / page_size
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** m = (ramdisk_size + page_size - 1) / page_size
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** o = (second_size + page_size - 1) / page_size
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**
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** 0. all entities are page_size aligned in flash
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** 1. kernel and ramdisk are required (size != 0)
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** 2. second is optional (second_size == 0 -> no second)
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** 3. load each element (kernel, ramdisk, second) at
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** the specified physical address (kernel_addr, etc)
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** 4. prepare tags at tag_addr. kernel_args[] is
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** appended to the kernel commandline in the tags.
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** 5. r0 = 0, r1 = MACHINE_TYPE, r2 = tags_addr
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** 6. if second_size != 0: jump to second_addr
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** else: jump to kernel_addr
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*/
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#if 0
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typedef struct ptentry ptentry;
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struct ptentry {
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char name[16]; /* asciiz partition name */
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unsigned start; /* starting block number */
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unsigned length; /* length in blocks */
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unsigned flags; /* set to zero */
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};
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/* MSM Partition Table ATAG
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**
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** length: 2 + 7 * n
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** atag: 0x4d534d70
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** <ptentry> x n
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*/
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#endif
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#endif
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