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Android_boot_image_editor
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Android_boot_image_editor/README.expert.md

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layout of boot.img

1. header part

          item                        size in bytes
+----------------------------------------------------------+
|<MAGIC HEADER>                  |     8                   |
|--------------------------------+-------------------------|
|<kernel length>                 |     4                   |
|--------------------------------+-------------------------|
|<kernel offset>                 |     4                   |
|--------------------------------+-------------------------|
|<ramdisk length>                |     4                   |
|--------------------------------+-------------------------|
|<ramdisk offset>                |     4                   |
|--------------------------------+-------------------------|
|<second bootloader length>      |     4                   |
|--------------------------------+-------------------------|
|<second bootloader offset>      |     4                   |
|--------------------------------+-------------------------|
|<tags offset>                   |     4                   |
|--------------------------------+-------------------------|
|<page size>                     |     4                   |
|--------------------------------+-------------------------|
| RESERVED                       |     4                   |
|--------------------------------+-------------------------|
|<os version& os patch level>    |     4                   |
|--------------------------------+-------------------------|
|<board name>                    |     16                  |
|--------------------------------+-------------------------|
|<cmdline part 1>                |     512                 |
|--------------------------------+-------------------------|
|<hash digest>                   |     32                  |
|--------------------------------+-------------------------|
|<cmdline part 2>                |     1024                |
|--------------------------------+-------------------------|
|<padding>                       | min(n * page_zie - 1632)|
+----------------------------------------------------------+

2. data part

+----------------------------------------------------------+
|<kernel>                        |   kernel length         |
|--------------------------------+-------------------------|
|<padding>                       |                         |
+----------------------------------------------------------+

+--------------------------------+-------------------------+
|<ramdisk>                       |   ramdisk length        |
|--------------------------------+-------------------------|
|<padding>                       |                         |
+----------------------------------------------------------+

+--------------------------------+-------------------------+
|<second bootloader>             | second bootloader length|
|--------------------------------+-------------------------|
|<padding>                       |                         |
+----------------------------------------------------------+