[linux-dvb] vbox cat's eye 3560 usb

Overmyer, Amy I. amy.overmyer at tellabs.com
Wed Feb 18 18:20:11 CET 2009

I'm trying to write a driver for the device, just as a learning
exercise. So far, I've got the firmware in intel hex format (from
usbsnoop on windows, then a couple perl scripts to mutate it) and am
able to use fxload to load it with -t fx2 and there are 2 separate
files, a short one (the loader) and the firmware proper; so in fxload I
have a -s and a -I. 


I'm able to take it from cold to warm that way. 


The device itself has a cypress CY7C68013A fx2 chip and a large tin can
tuner/demod stamped with Thomson that has a sticker on it identifying it
as 8601A. Helpfully, the 3560 opens up easily with the removal of two
screws on the shell.


It's cold boot usb id is 14f3:3560 and its warm boot is 14f3:a560.


I have taken that hex file and created a binary file out of the 2nd file
(-I in fxload speak). I think, correct me if I'm wrong, there is already
a fx2 loader available, thus I will not need the loader file.


One of the stranger things I saw in the usbsnoop trace in windows was
when it came to reset of the CPUCS, the driver sent down both a poke at
x0e600 and a poke at 7f92. One is the fx CPUCS register, I believe the
other is a fx2 CPUCS register. 


Currently I am mutating dibusb-mc just to see if I can get it to the
point of going from cold to warm in the driver. 


I have taken usb sniffs from windows of doing things such as scanning
for channels, watching a channel, etc. so I can try to figure out if
anything else in the v4l-dvb collection behaves similarly.


I guess what I'm looking for is any hints that might be useful to
figuring this out. 


Like I said, it's a learning exercise, I already have enough tuners, and
anyway, the cost of buying a supported tuner is far cheaper than the
time needed to develop this!


Thanks for any info! I've pretty much devoured everything available on
the wiki.



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