rpi/dwc2 kernel panics

[Nick Hudson]

On 02/13/14 18:47, Andre Heider wrote:
> On Wed, Feb 12, 2014 at 08:00:18PM -0700, Stephen Warren wrote:
>> On 02/12/2014 11:52 AM, Andre Heider wrote:
>>> Hi guys,
>>>
>>> I just tried today's Linus' master (45f7fdc2ff) with usb-linus (3635c7e2d5)
>>> merged on top to give the latest dwc2 fixes another try.
>>> Unfortunately I'm getting various crashes on system startup. Kernel boots
>>> fine, dwc2 and the integrated smsc95xx are detected, but somewhere in the
>>> init sequence the system panics.
>> I haven't ever seen crashes like that, when running linux-next. I also
>> merged those two exact commits together and didn't see any issue in 10
>> boot cycles.
> Same thing here with linux-next (Linux rpi 3.14.0-rc2-next-20140213-rpi).
> The last traces has systemd in there, but good old sysvinit crashed
> spectacular too.
>
>> FWIW, I am running:
>> * A rev2 Model B
>> * Firmware commit 9c3d7b6 "Add latest linaro gcc toolchain:
>> gcc-linaro-arm-linux-gnueabihf-raspbian-2012.08-20120724_linux"
>> * Upstream U-Boot (very recent) and kernel
>> * Using Ubuntu 13.10's packaged ARM cross-compiler
> Huh, switching compilers made a difference...
>
> I was using debian's cross compiler [0], 4.8.2, which has a couple of
> patches [1].
>
> With my old self compiled and unpatched toolchains I didn't yet get
> any crashes, I tried:
> binutils 2.20	+ gcc 4.4.4
> binutils 2.21.1	+ gcc 4.4.7
> binutils 2.23.1	+ gcc 4.7.1
> binutils 2.24	+ gcc 4.7.2
>
> but with these versions (also unpatched) I do get the crashes:
> binutils 2.23.2	+ gcc 4.8.1
> binutils 2.24	+ gcc 4.8.2

I saw problems with 4.8 on NetBSD/evbarm and my RaspberryPI. They were 
fixed by changes to the gcc-4_8-branch some time after 4.8.2.

Nick