Re: [Qemu-devel] qemu: hardware error: pl011_read: Bad offset 16000018

[Prasad Joshi <prasadjoshi124@gmail.com>]

On Mon, Nov 29, 2010 at 3:13 PM, Peter Maydell <peter.maydell@linaro.org> wrote:
> On 29 November 2010 14:37, Prasad Joshi <prasadjoshi124@gmail.com> wrote:
>> I am running QEMU Arm emulation on x86_64 machine. I downloaded the
>> arm-test kernel and the initrd image available on QEMU download site.
>>
>> When I run the qemu-system-arm with the memory less than or equal to
>> 256M everything works fine.
>> prasad@prasad-desktop:~/Downloads/arm-test$ qemu-system-arm -kernel
>> zImage.integrator -initrd arm_root.img -m 256
>>
>> But, when I assign memory more than 256M it fails to run
>
> This is because the Integrator development board only supports
> a maximum of 256M of RAM (the hole in its physical address
> layout for RAM is that large, and after that come some memory
> mapped devices).
>

Thanks a lot Peter for your reply.

I tried to emulate few other boards as well. IMHO, versatilepb
supports more than 256M RAM, I guess it supports upto 512MB. But it
too fails

prasad@prasad-desktop:~/Downloads/arm_prasad$ qemu-system-arm -M
versatilepb -kernel vmlinuz-2.6.26-2-versatile -initrd
initrd.img-2.6.26-2-versatile -hda debian_lenny_arm_small.qcow2
-append "root=/dev/sda1" -m 512
qemu: hardware error: pl011_read: Bad offset 101f1018

CPU #0:
R00=000133ed R01=101f1000 R02=00000055 R03=ffffffff
R04=00008000 R05=00199430 R06=41069265 R07=00000183
R08=00000100 R09=00000000 R10=0017ff8c R11=00189418
R12=0018941c R13=0018940c R14=00013060 R15=00010afc
PSR=200001d3 --C- A svc32
Aborted


>> prasad@prasad-desktop:~/Downloads/arm-test$ qemu-system-arm -kernel
>> zImage.integrator -initrd arm_root.img -m 512
>> qemu: hardware error: pl011_read: Bad offset 16000018
>
> It's a bug that we don't do something sensible when the user
> requests more memory than the board supports (like bailing
> out with an error), rather than blindly mapping both RAM and
> devices into the same place and then booting the kernel.
>
> (Slight tangent but related:) the interface to the board init
> routine for "how much RAM should we model?" is a bit
> limiting because there's no way to tell the difference between
> "ram size specified by user on command line" and "ram size
> which is a random default from vl.c". (It would be useful for
> most boards models to default to whatever the maximum
> standard amount of memory for them is, for instance.)
>
> Incidentally the Integrator is a truly ancient devboard and I'm
> not sure it deserves to be the default any more ;-)
>
> -- PMM
>