[Buildroot] /dev/ttyS0 in filesystem created by Buildroot can't be opened in Qemu

[Baruch Siach <baruch@tkos.co.il>]

Hi Mihajlo,

On Mon, Jul 09, 2012 at 04:40:52PM +0200, Mihajlo Jovanovi? wrote:
> Hi Baruch,
> 
> Thanks for this hint. I have rebuilt everything with
> qemu_arm_vexpress_defconfig configuration file.
> 
> I have noticed that it created ext2 filesystem, instead of cpio, as I was
> planning to do, to be as close to tutorial as possible.
> 
> Nevertheless, I have launched Qemu like this:
> 
> qemu-system-arm -M vexpress-a9 -kernel zImage -initrd rootfs.ext2 -serial
> stdio -append "console=ttyAMA0"
> 
> Where zImage and rootfs.ext2 are kernel image and filesystem created by
> Buildroot, respectively.
> 
> Now there are no complaints about missing /dev/ttyS0 any more, but kernel
> prints the message that it can not mount filesystem:

[...]

Quoting board/qemu/arm-vexpress/readme.txt:

Run the emulation with:

  qemu-system-arm -M vexpress-a9 -kernel output/images/zImage -drive file=output/images/rootfs.ext2,if=sd -append "console=ttyAMA0,115200 root=/dev/mmcblk0" -serial stdio -net nic,model=lan9118 -net user

The login prompt will appear in the terminal that started Qemu. The
graphical window is the framebuffer.

baruch

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