Den 22.12.2015 20:01, skrev Eric Anholt:
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
or something.
I haven't seen any problems other than the printk, though.
Downstream has this patch[1]:
irq-bcm2836: Prevent spurious interrupts, and trap them early
It has been used in the nightly build of OpenELEC[2] for 5 days now without
any complaints (used with the downstream ARCH_BCM2709).
[1]
https://github.com/raspberrypi/linux/commit/688a5f2ada4fbd16547b574a17e6d359ab2364d0
[2] http://forum.kodi.tv/showthread.php?tid=250817&pid=2192054#pid2192054
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