[PATCH v2 0/8] Raspberry Pi 2 support.
eric at anholt.net
Tue Dec 22 11:01:31 PST 2015
Alexander Aring <alex.aring at gmail.com> writes:
> On Mon, Dec 21, 2015 at 03:07:44PM -0800, Eric Anholt wrote:
>> > But still getting this panic, your patches does not contain some
>> > defconfig, so I still try to figure out what I need to enable to get it
>> > working. Maybe it is some missing config entry which should be enabled.
>> > But, for me it looks like some devicetree issue, because of_iomem returns
>> > NULL, at . Don't know what I am doing wrong.
>> My best guess is that since you're not using U-Boot, the firmware's
>> mangling the DT in some way that breaks us. Notably, in my current
>> firmware checkout, set /soc/ranges to just the first entry that we're
>> using, which would break the mapping. However,
>> rpi/rpi-4.4.y:arch/arm/boot/dts/bcm2709.dtsi uses the same /soc/ranges
>> setup that we do, so I'm not sure what's going on. Perhaps
>> bcm2709_io_desc's initialization covers for it?
> I boot here with two different bootloaders, both ends in the same panic.
> Finally I figured out if I do a user/kernel split (2G/2G) then the
> issue is gone.
Huh. Not sure what's going on there.
> Later I need to enable "CONFIG_HAVE_ARM_ARCH_TIMER" so the kernel
> doesn't hang forever.
I'll add a dependency for that -- we definitely want the arch timer. I
would have thought that the 2835 timer would still be able to make
things work, though.
> After finally booting the RPi2 I get several messages of:
> unexpected IRQ trap at vector 00
> while typing _one_ character over uart.
We were doing some debugging of that recently. It seems that every once
in a while we get woken up but nothing shows up in the top-level status
register. We need to just make the irqchip ignore instead of trying to
look up a handler in that case, but I haven't prioritized it because it
makes me worry that I'm just papering over a problem in our IRQ masking
I haven't seen any problems other than the printk, though.
> Can you provide somehow your RPi2 kernelconfig?
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