linux-kernel - Re: [PATCH v2 0/8] Raspberry Pi 2 support.

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Date:	Tue, 22 Dec 2015 15:26:49 +0100
From:	Alexander Aring <alex.aring@...il.com>
To:	Eric Anholt <eric@...olt.net>
Cc:	linux-rpi-kernel@...ts.infradead.org,
	Mark Rutland <mark.rutland@....com>,
	devicetree@...r.kernel.org,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Florian Fainelli <f.fainelli@...il.com>,
	Jason Cooper <jason@...edaemon.net>,
	Scott Branden <sbranden@...adcom.com>,
	Marc Zyngier <marc.zyngier@....com>,
	Ray Jui <rjui@...adcom.com>, linux-kernel@...r.kernel.org,
	Rob Herring <robh+dt@...nel.org>,
	bcm-kernel-feedback-list@...adcom.com,
	Kumar Gala <galak@...eaurora.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v2 0/8] Raspberry Pi 2 support.

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 [0]. 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.

Later I need to enable "CONFIG_HAVE_ARM_ARCH_TIMER" so the kernel
doesn't hang forever.

After finally booting the RPi2 I get several messages of:

unexpected IRQ trap at vector 00

while typing _one_ character over uart.

Can you provide somehow your RPi2 kernelconfig?

- Alex
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