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59 lines
3.2 KiB
Markdown
59 lines
3.2 KiB
Markdown
# layout of boot.img
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### 1. header part
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item size in bytes
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+----------------------------------------------------------+
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|<MAGIC HEADER> | 8 |
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|--------------------------------+-------------------------|
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|<kernel length> | 4 |
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|--------------------------------+-------------------------|
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|<kernel offset> | 4 |
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|--------------------------------+-------------------------|
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|<ramdisk length> | 4 |
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|--------------------------------+-------------------------|
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|<ramdisk offset> | 4 |
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|--------------------------------+-------------------------|
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|<second bootloader length> | 4 |
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|--------------------------------+-------------------------|
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|<second bootloader offset> | 4 |
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|--------------------------------+-------------------------|
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|<tags offset> | 4 |
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|--------------------------------+-------------------------|
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|<page size> | 4 |
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|--------------------------------+-------------------------|
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| RESERVED | 4 |
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|--------------------------------+-------------------------|
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|<os version& os patch level> | 4 |
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|--------------------------------+-------------------------|
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|<board name> | 16 |
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|--------------------------------+-------------------------|
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|<cmdline part 1> | 512 |
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|--------------------------------+-------------------------|
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|<hash digest> | 32 |
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|--------------------------------+-------------------------|
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|<cmdline part 2> | 1024 |
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|--------------------------------+-------------------------|
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|<padding> | min(n * page_zie - 1632)|
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+----------------------------------------------------------+
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### 2. data part
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+----------------------------------------------------------+
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|<kernel> | kernel length |
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|--------------------------------+-------------------------|
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|<padding> | |
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+----------------------------------------------------------+
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+--------------------------------+-------------------------+
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|<ramdisk> | ramdisk length |
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|--------------------------------+-------------------------|
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|<padding> | |
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+----------------------------------------------------------+
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+--------------------------------+-------------------------+
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|<second bootloader> | second bootloader length|
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|--------------------------------+-------------------------|
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|<padding> | |
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+----------------------------------------------------------+
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