Re: [Gumstix-users] U-boot loading FPGA - Now with problems!

[Steve M. <mo...@sm...>]

sounds like IRQ problem.  eth0 using the same one maybe? 

On Apr 3, 2011, at 3:08 PM, Devin Hughes wrote:

> Hi everyone,
> 
> I ported the armadeus fpgaloader driver recommended by Linus to program 
> an altera fpga on a custom baseboard and it works, but I seem to be 
> having a lot of trouble with the lan9221. The fpgaloader will load the 
> fpga no problem as long as the ethernet(eth0 in my case) is not 
> associated. I've even tried loading the processor down with data 
> transfers(/dev/zero ->/dev/null), simple programs, etc., while running 
> the fpgaloader and it works every time. However, as soon as the eth0 
> interface associates with an ip address, the fpga driver will deadlock 
> while writing - no kernel oops, no error, just hard reset the board. 
> Also, linux seems to be ignoring the MAC address that's programmed into 
> the EEPROM connected to the lan9221(the contents are valid, I can check 
> them with ethtool). So, all this makes me wonder if the lan9221 drivers 
> are buggy, or if I'm doing something incredibly wrong here. Is anyone 
> else having trouble with something like this? The same problems are 
> reproducible on kernel versions 2.6.35,36 with and without Xenomai; I've 
> even tried it on the precompiled factory image. I wrote a little script 
> that brings eth0 down, programs the fpga, then brings eth0 back up, but 
> this feels like a real hack. Any ideas what could cause such a hard 
> crash? I can attach the modified driver files if anyone is interested.
> 
> Thanks,
> Devin
> 
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