[Prism54-devel] Re: USB CVS snapshot

[Ian Kent]

On Tue, 23 Nov 2004, Karsten Richter wrote:

> Johannes Steingraeber wrote:
> 
> > For me (Medion XG-701A) it's built into wlanuig.sys. A hexdump looks
> > somewhat like this:
> It seems that in the meantime most prism drivers don't use the good old 
> .asm files but integrate them into the .sys drivers.
> Anyway knowing some of the contents of the firmware is very helpful to 
> find it: simply search for the string "inlbuild" in the drivers.
> 
> All firmware files I saw contain something like this:
> 
> 0000110: 0000 0000 0000 0000 0000 0000 5665 7273  ............Vers
> 0000120: 696f 6e20 322e 342e 332e 3720 6275 696c  ion 2.4.3.7 buil
> 0000130: 7420 6f6e 2057 6564 204a 616e 2037 2031  t on Wed Jan 7 1
> 0000140: 343a 3134 3a31 3920 4345 5420 3230 3034  4:14:19 CET 2004
> 0000150: 2062 7920 696e 6c62 7569 6c64 4074 6978   by inlbuild at tix
> 
> 
>  > 00000970:                               0000 a0e1              ....
>  > 00000980: e0f3 9fe5 0000 0000 0000 0000 0000 0000  ................
>  > 00000990: 0100 0080 0100 0000 4c4d 3836 0200 0080  ........LM86....
>  > 000009a0: 0600 0000 322e 342e 332e 3000 0000 0000  ....2.4.3.0.....
> 
> I just recently extracted a 2.4.3.7 firmware from a Shuttle PN 15 driver 
> (AWUSGA02.sys) which starts with a very similar byte sequence:
> 
> 0000000: 0000 a0e1 dcf3 9fe5 0000 0000 0000 0000  ................
> 0000010: 0000 0000 0100 0080 0100 0000 4c4d 3836  ............LM86
> 0000020: 0200 0080 0600 0000 322e 342e 332e 3700  ........2.4.3.7.
> 
> Does anybody know what those a0e1.. bytes mean? All 2.4.3.x releases I 
> was able to extract differ only in the same one or two bytes. Seems to 
> be a version information. Maybe there is even the firmware size or 
> checksum encoded somewhere? Does anybody know if it's possible to derive 
> the firmware size from some bytes of the firmware image?
> It would save some time when extracting newer firmware versions.

Yes. That's in the firmware extractor on the web site (I missed it before) 
at http://jbnote.free.fr/prism54usb/data/scripts/fwextract.tar.bz2.

This works a treat.

And Sebastien has posted his link in a following mail.

Ian