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

[Guenter Roeck <linux@roeck-us.net>]

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)

Do you have a special devicetree file ?

It also doesn't seem to accept the qemu "initrd" argument, which is unexpected.

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