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Copyright (C) 2007-2011 pancake <pancake@youterm.com>
Copyright (C) 2011-2012 Pali Rohár <pali.rohar@gmail.com>
SPECS FOR THE FIASCO FIRMWARE FILE FORMAT ffff!
-----------------------------------------------
This is final working version of FIASCO format. FIASCO image which
is generated by this spec is acceptable by Nokia flasher-3.5 and
unpack data same as FIASCO image generated by Nokia fiasco-gen. This
format is implemented in 0xFFFF and every image which I tested
(generated by 0xFFFF and fiasco-gen) was properly unpacked under
0xFFFF and flasher-3.5 with same result. Small difference is that
fiasco-gen add some unknown subsection block to image header
(type '4' or '/') which contains some messy characters... But if
these sections missing, flasher-3.5 working fine too. And old FIASCO
images (for N8x0) does not have these subsection...
FILE HEADER
1 byte = 0xb4 -- signature
4 bytes -- FW header length (big endian)
FW HEADER
4 bytes -- number of FW header blocks (big endian)
block {
1 byte -- type of block
0xE8 - Fiasco name
0x31 - FW name
1 byte -- length of block data
N bytes -- block data
}
IMAGE
1 byte = 0x54 -- signature
1 byte -- number of subsection blocks + 1
5 bytes -- unknown (always 0x2e 0x19 0x01 0x01 0x00)
2 bytes -- checksum for the image contents (xorpair) (big endian)
12 bytes -- image name type (first byte is FF if is the last image)
4 bytes -- length of image data (big endian)
4 bytes -- unknown (always 0x00 0x00 0x00 0x00)
block {
1 byte -- type of subsection block
'1' - version
'2' - device & hw revisions (size of device is 16, hw revision 8)
'3' - layout
'4' - unknown
'/' - unknown
1 byte -- length of subsection block
N bytes -- subsection block data
}
1 byte -- unknown (0x00 is accepted, maybe end of subsections?)
N bytes -- image data
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