FIRM: Difference between revisions
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A structural example of a FIRM file (created using the specs in [https://github.com/3dshax/ctr ctrtool]) can be found [http://depositfiles.com/files/lzpo8yqyo here] (Note does not contain ARM code, it's just a structural example) | A structural example of a FIRM file (created using the specs in [https://github.com/3dshax/ctr ctrtool]) can be found [http://depositfiles.com/files/lzpo8yqyo here] (Note it does not contain any ARM code, it's just a structural example) | ||
== FIRM Header == | == FIRM Header == | ||
Revision as of 12:39, 23 August 2012
Overview
This is the file format for the 3DS' Firmware, it contains four 'sections' of ARM code (ARM9 and ARM11). The firmware sections are not encrypted in the FIRM format.
A structural example of a FIRM file (created using the specs in ctrtool) can be found here (Note it does not contain any ARM code, it's just a structural example)
FIRM Header
| OFFSET | SIZE | DESCRIPTION |
|---|---|---|
| 0x000 | 4 | Magic 'FIRM' |
| 0x004 | 4 | Reserved1 |
| 0x008 | 4 | ARM11 Entrypoint |
| 0x00C | 4 | ARM9 Entrypoint |
| 0x010 | 0x030 | Reserved2 |
| 0x040 | 0x0C0 (0x030*4) | Firmware Section Headers |
| 0x100 | 0x100 | RSA-2048 signature of the FIRM header, using SHA-256. |
Firmware Section Headers
| OFFSET | SIZE | DESCRIPTION |
|---|---|---|
| 0x000 | 4 | Offset |
| 0x004 | 4 | Address |
| 0x008 | 4 | Size |
| 0x00C | 4 | Firmware Type ('0'=ARM9/'1'=ARM11) |
| 0x010 | 0x020 | SHA-256 Hash of Firmware Section |