linux-kernel - Re: Enable arm_global_timer for Zynq brakes boot

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Message-ID: <fe6d6c61-3460-4f41-830d-f42891f29d1e@VA3EHSMHS022.ehs.local>
Date:	Tue, 6 Aug 2013 09:13:32 -0700
From:	Sören Brinkmann <soren.brinkmann@...inx.com>
To:	Daniel Lezcano <daniel.lezcano@...aro.org>
CC:	<monstr@...str.eu>, Michal Simek <michal.simek@...inx.com>,
	Stuart Menefy <stuart.menefy@...com>,
	Stephen Boyd <sboyd@...eaurora.org>,
	John Stultz <john.stultz@...aro.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Russell King <linux@....linux.org.uk>,
	<linux-kernel@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: Enable arm_global_timer for Zynq brakes boot

On Tue, Aug 06, 2013 at 06:09:09PM +0200, Daniel Lezcano wrote:
> On 08/06/2013 03:18 PM, Michal Simek wrote:
> 
> [ ... ]
> 
> >>>>> Soren: Are you able to replicate this issue on QEMU?
> >>>>> If yes, it should be the best if you can provide Qemu, kernel .config/
> >>>>> rootfs and simple manual to Daniel how to reach that fault.
> >>>>
> >>>> I tried to download qemu for zynq but it fails:
> >>>>
> >>>> git clone git://git.xilinx.com/qemu-xarm.git
> >>>> Cloning into 'qemu-xarm'...
> >>>> fatal: The remote end hung up unexpectedly
> >>>
> >>> Not sure which site have you found but
> >>> it should be just qemu.git
> >>> https://github.com/Xilinx/qemu
> >>>
> >>> or github clone.
> >>
> >> Ok, cool I was able to clone it.
> >>
> >>>> I am also looking for the option specified for the kernel:
> >>>>
> >>>> "The kernel needs to be built with this feature turned on (in
> >>>> menuconfig, System Type->Xilinx Specific Features -> Device Tree At
> >>>> Fixed Address)."
> >>
> >> Ok.
> >>
> >>> This also sound like a very ancient tree.
> >>> This is the latest kernel tree - master-next is the latest devel branch.
> >>> https://github.com/Xilinx/linux-xlnx
> >>
> >> Ok, cool. I have the right one.
> 
> Following the documentation, I was able to boot a kernel with qemu for
> the linux-xlnx and qemu-xilinx.
> 
> But this kernel is outdated regarding the upstream one, so I tried to
> boot a 3.11-rc4 kernel without success, I did the following:
> 
> I used the default config file from linux-xlnx for the upstream kernel.
> 
> I compiled the kernel with:
> 
> make -j 5 ARCH=arm CROSS_COMPILE=arm-linux-gnueabi-
> UIMAGE_LOADADDR=0x8000 uImage
> 
> I generated the dtb with:
> 
> make -j 5 ARCH=arm CROSS_COMPILE=arm-linux-gnueabi- dtbs
> 
> For qemu, I started qemu with:
> 
> ./arm-softmmu/qemu-system-arm -M arm-generic-fdt -nographic -smp 2
> -machine linux=on -serial mon:stdio -dtb zynq-zed.dtb -kernel
> kernel/zImage -initrd filesystem/ramdisk.img
> 
> I tried with the dtb available for the upstream kernel:
> 
> zynq-zc706.dtb, zynq-zc702.dtb and zynq-zed.dtb
> 
> Did I miss something ?

Unfortunately the public github QEMU is behind our internal development.
IIRC, there were a couple of DT compatible strings QEMU didn't know.
Those are sometimes removed making boot fail/hang.

Are you on IRC? It's probably easier to resolve this in a more direct
way (I'm 'sorenb' on freenode). Otherwise I could give you a few more
instructions for debugging this per mail?

	Sören


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