[Patch-gnuradio] Re: [Discuss-gnuradio] USRP2 SD Card rewrite

[Dan Halperin]

On Nov 2, 2008, at 4:01 PM, Robert McGwier wrote:
> The correct instructions seem to be
>
> cd usrp2/firmware
> Run "sudo ./u2_flash_tool --dev=/dev/XXXX -t s/w ./apps/txrx.bin -w"
>
> with the rest which I emphasize again.  If you get the wrong XXXX for
> the device,  you can wipe out your hard drive.  Most people will have
> their hard drive as /dev/sda and on my computer it seems the device
> is, like Matt's computer, to be /dev/sdb.

An obvious thing to do here is to read the size of the device and  
abort if it's > 2 or 4 GB. It's simple to get the device size (this  
works on /dev/sda1 in ubuntu 8.10 using python 2.6 at least):

    dev = open(devname, "r")
    dev.seek(0, os.SEEK_END)
    size_in_gigs = dev.tell() / (2.0**30)

Thanks,

Dan