5efbed3b27
The Android Image contains 3 components and params - kernel - initrd - second stage (optional) - tags addr - bootargs In fast boot the initrd is mandatory, in barebox we are less restrictive use the initrd only if present add to env params: aimage_noverwrite_bootargs Disable overwrite of the bootargs with the one present in aimage aimage_noverwrite_tags Disable overwrite of the tags addr with the one present in aimage Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com> Cc: Magnus Damm <magnus.damm@gmail.com> Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
75 lines
1.7 KiB
C
75 lines
1.7 KiB
C
/*
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* (C) Copyright 2011 Jean-Christhophe PLAGNIOL-VILLARD <plagniol@jcrosoft.com>
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*
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* Android boot image
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*
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* Under GPLv2 only
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*/
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#ifndef __AIMAGE_H__
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#define __AIMAGE_H__
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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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struct android_header_comp
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{
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unsigned size;
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unsigned load_addr;
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};
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struct android_header
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{
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u8 magic[BOOT_MAGIC_SIZE];
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struct android_header_comp kernel;
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struct android_header_comp ramdisk;
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struct android_header_comp second_stage;
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/* physical addr for kernel tags */
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unsigned tags_addr;
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/* flash page size we assume */
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unsigned page_size;
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/* future expansion: should be 0 */
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unsigned unused[2];
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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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};
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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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#endif /* __AIMAGE_H__ */
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