Re: [Trisquel-users] Free Driver for Ralink RT2790?

[legimet . calc]

I'm not sure about the legality of disassembling that blob, because although  
it should be GPL (and the website says it's GPL) there's no source code which  
is a requirement of the GPL. And if you open the zip file with the firmware,  
there's a nonfree license.

Anyway, I compiled the rt2x00 drivers with debugging support and installed on  
my system. So far all I've figured out is a few details about the format of  
the firmware blob. The last 2 bytes contain a CRC16 checksum of the rest of  
the file, and the second-last 2 bytes contain the version. The blob seems to  
be in 2 parts. The first half contains some code, and after that is filled  
with 0xFF's. The second half contains some code, and after that is filled  
with 0x00's (except for those last 4 bytes). After removing the whole second  
half of the blob, it still connects fine, but outputs some warnings.