Re: [Qemu-devel] QEMU+Linux ARMv7A current state

[Peter Crosthwaite]

On Sun, Oct 4, 2015 at 6:08 PM, Guenter Roeck <address@hidden> wrote:
> On 10/04/2015 02:38 PM, Beniamino Galvani wrote:
>>
>> On Sun, Oct 04, 2015 at 02:11:35PM -0700, Guenter Roeck wrote:
>>>
>>> What is your qemu command line ?
>>
>>
>> qemu-system-arm \
>>              -M cubieboard \
>>              -kernel ../linux/zImage-dtb \
>>              -serial stdio \
>>              -append "console=ttyS0 rw root=/dev/nfs
>> nfsroot=10.0.0.1:/nfs,v3 ip=10.0.0.22" \
>>              -m 1024 \
>>              -net nic,vlan=0,model=allwinner-emac \
>>              -net tap,vlan=0,ifname=tap0,script=net-up.sh \
>>              -s \
>>              -d guest_errors
>>
>> Beniamino
>>
>
> With the mainline kernel and sun4i-a10-cubieboard.dtb, this gives me lots of
>
> [    2.480983] Division by zero in kernel.
> [    2.481074] CPU: 0 PID: 1 Comm: swapper/0 Not tainted
> 4.3.0-rc3-00055-gdd36d7393d63 #1
> [    2.481250] Hardware name: Allwinner A1X (Device Tree)
> [    2.481376] [<c02186a8>] (unwind_backtrace) from [<c0213d84>]
> (show_stack+0x10/0x14)
> [    2.481544] [<c0213d84>] (show_stack) from [<c047cff0>]
> (dump_stack+0x78/0x94)
> [    2.481700] [<c047cff0>] (dump_stack) from [<c047bb38>] (Ldiv0+0x8/0x10)
> [    2.481848] [<c047bb38>] (Ldiv0) from [<c0886ab0>]
> (sun4i_a10_get_mod0_factors+0x74/0xb8)
> [    2.482024] [<c0886ab0>] (sun4i_a10_get_mod0_factors) from [<c08867e4>]
> (clk_factors_determine_rate+0x68/0xfc)
> [    2.482231] [<c08867e4>] (clk_factors_determine_rate) from [<c0871070>]
> (clk_composite_determine_rate+0x94/0x1d0)
> [    2.482443] [<c0871070>] (clk_composite_determine_rate) from [<c086c960>]
> (clk_core_round_rate_nolock+0x84/0xa8)
> [    2.482654] [<c086c960>] (clk_core_round_rate_nolock) from [<c086dcbc>]
> (clk_round_rate+0x38/0x54)
> [    2.482845] [<c086dcbc>] (clk_round_rate) from [<c084246c>]
> (sunxi_mmc_set_ios+0x9c/0x314)
> [    2.483023] [<c084246c>] (sunxi_mmc_set_ios) from [<c0814564>]
> (mmc_power_up+0xf8/0x104)
> [    2.483197] [<c0814564>] (mmc_power_up) from [<c08151d8>]
> (mmc_start_host+0x44/0x6c)
> [    2.483363] [<c08151d8>] (mmc_start_host) from [<c0816244>]
> (mmc_add_host+0x58/0x7c)
> [    2.483528] [<c0816244>] (mmc_add_host) from [<c0842b6c>]
> (sunxi_mmc_probe+0x488/0x590)
> [    2.483701] [<c0842b6c>] (sunxi_mmc_probe) from [<c06287d0>]
> (platform_drv_probe+0x48/0xa4)
>

I think that's the expected warnings we have been ignoring. I have a
hack to make them go away.

> Do you have a special devicetree file ?
>
> It also doesn't seem to accept the qemu "initrd" argument, which is
> unexpected.
>

Yes I noticed the same and went to the SATA solution.

Regards,
Peter

> Any idea what might be wrong ? Here is the command line I tried.
>
> qemu-system-arm \
>         -M cubieboard -kernel arch/arm/boot/zImage -no-reboot \
>         -initrd core-image-minimal-qemuarm.cpio \
>         -append "rdinit=/sbin/init console=ttyS0" \
>         -nographic -monitor none -serial stdio \
>         -dtb arch/arm/boot/dts/sun4i-a10-cubieboard.dtb
>
> Thanks,
> Guenter
>