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SPECS FOR TEH FIASCO FIRMWARE FILE FORMAT ffff!
-----------------------------------------------
These notes has not been taken properly and may be wrong. It must
be revised to fit the reality. But this is mostly a general idea:
FILE HEADER
1 byte = 0xb4 -- signature
4 bytes -- firmware name length (big endian)
6 bytes -- versioning info ( byte 4 is format version )
N-6 bytes -- firmware name (zero fill)
PIECE HEADER
1 byte = 0x54 -- piece signature
1 byte -- unknown:
N800/N810:
0x02 - initfs, rootfs, kernel (2007)
0x03 - xloader, 2nd, secondary, kernel (DIABLO)
N900:
0x03 - kernel, rootfs, cmt-2nd, cmt-algo, cmt-mcusw
0x04 - xloader, 2nd, secondary
0x05 - mmc
5 bytes -- unknown (always 0x2e 0x19 0x01 0x01 0x00)
2 bytes -- checksum for the piece contents (xorpair)
12 bytes -- piece name (first byte is FF if is the last)
4 bytes -- piece size (big endian)
4 bytes -- unknown (always 0x00 0x00 0x00 0x00)
block {
1 byte -- if (value '1'-'4' or '/') { ..there's a comment.. }
'1' - version
'2' - device & hw revisions
'3' - layout
'4' - unknown
'/' - unknown
1 byte -- length of comment
N bytes -- comment
}
N bytes -- piece data
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