interrupt storm on Dreamplug for interrupts 12 and 16

[Ian Lepore]

On Tue, 2012-12-11 at 14:45 +0100, Matthieu Kraus wrote:
> Greetings,
> 
> I tried updating my kernel on my Dreamplug yesterday (been running  
> r228127 so far which worked quite well), however I'm running into  
> issues with the ethernet controllers after the update - namely I'm  
> constantly getting interrupt storms on interrupts 12 and 16 which  
> belong to mge0 and mge1 respecively rendering non-functional.
> 
> does anyone have some pointers what may cause it?
> 
> the diff I'm running with (old kernel used the same besides the USB  
> option to fix the CAM issues) is attached:
> 
> the patch for if_mge is pretty old and grabbed from this ML and helps  
> against some awful watchdog timeouts I encountered very often, the one  
> for cpuvar.h allows to build zfs (I have an external RAID controller  
> attached via esata on which my zfs pool resides)
> 
> the dts is mostly based off an ultimate-rd one with some adjustments  
> based off the settings linux uses

Here are the dts files I've been using for the NOR (1001) and NAND
(1001N) models of dreamplug; they look a bit different than yours.

Also, I've got no patches in the mge driver these days, but I do live
with the fact that I have to have cables plugged into both ports or
there are annoyingly-long timeouts trying to DHCP at boot time.

In fact, the only patches I'm using for dreamplug are the attached dts,
and personal kernel config choices, plus the one I posted about a week
ago to leave the cache allocate-on-write feature set the way the
bootloader set it.

I'm currently running -current @r243920 on dreamplug.

-- Ian

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