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From: =?UTF-8?Q?Noralf_Tr=c3=b8nnes?= <noralf@tronnes.org>
Subject: Re: [PATCH v2 0/8] Raspberry Pi 2 support.
Date: Sat, 26 Dec 2015 22:38:05 +0100
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To: Eric Anholt <eric@anholt.net>, Alexander Aring <alex.aring@gmail.com>, Phil <phil@raspberrypi.org>
Cc: Mark Rutland <mark.rutland@arm.com>, devicetree@vger.kernel.org, Florian Fainelli <f.fainelli@gmail.com>, Jason Cooper <jason@lakedaemon.net>, Scott Branden <sbranden@broadcom.com>, Ian Campbell <ijc+devicetree@hellion.org.uk>, Marc Zyngier <marc.zyngier@arm.com>, Ray Jui <rjui@broadcom.com>, linux-kernel@vger.kernel.org, Rob Herring <robh+dt@kernel.org>, bcm-kernel-feedback-list@broadcom.com, linux-rpi-kernel@lists.infradead.org, Kumar Gala <galak@codeaurora.org>, Thomas Gleixner <tglx@linutronix.de>, linux-arm-kernel@lists.infradead.org
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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