[Qemu-devel] qemu -nographics option

[Qemu-devel] qemu -nographics option

[David Craven]

Hello qemu devs,

I previously asked this question on stack overflow but didn't get an
answer, so I thought I'd ask here:

Stdio doesn't show in qemu with the -nographic option.
This is my qemu invocation. It prints hello world when
using `-serial stdio` but only displays kernel output when
using `-nographic`. (From the docs I gather these two are
mutually exclusive options)

```
    qemu-system-arm \
        -kernel zImage \
        -append "\
            console=ttyAMA0,115200 console=tty highres=off console=ttyS0 \
            rdinit=/bin/static-hello \
            panic=1" \
        -initrd rootfs.cpio.gz \
        -dtb vexpress-v2p-ca9.dtb \
        -M vexpress-a9 \
        -m 512 \
        -nographic \
        -no-reboot
```

How do I get this to work with the `-nographic` option?

David

Re: [Qemu-devel] qemu -nographics option

[mar.krzeminski]

Hello,

Have you try to add chardev device?

-chardev stdio,mux=on,id=terminal -serial chardev:terminal

I am also not sure if you so many consoles in kernel command line,
since you do not want to use any graphic mode.

Regards,
Marcin


W dniu 11.06.2016 o 16:22, David Craven pisze:
> Hello qemu devs,
>
> I previously asked this question on stack overflow but didn't get an
> answer, so I thought I'd ask here:
>
> Stdio doesn't show in qemu with the -nographic option.
> This is my qemu invocation. It prints hello world when
> using `-serial stdio` but only displays kernel output when
> using `-nographic`. (From the docs I gather these two are
> mutually exclusive options)
>
> ```
>      qemu-system-arm \
>          -kernel zImage \
>          -append "\
>              console=ttyAMA0,115200 console=tty highres=off console=ttyS0 \
>              rdinit=/bin/static-hello \
>              panic=1" \
>          -initrd rootfs.cpio.gz \
>          -dtb vexpress-v2p-ca9.dtb \
>          -M vexpress-a9 \
>          -m 512 \
>          -nographic \
>          -no-reboot
> ```
>
> How do I get this to work with the `-nographic` option?
>
> David
>
>

Re: [Qemu-devel] qemu -nographics option

[David Craven]

Hello Marcin

Reordering the console statements worked. The reason I had so many consoles
in the kernel command line was because it was recommended in
redirect-qemu-window-output-to-terminal-running-qemu
<https://stackoverflow.com/questions/19565116/redirect-qemu-window-output-to-terminal-running-qemu>.
I wasn't aware that ordering was important.

Thank you!
David

On Sat, Jun 11, 2016 at 9:52 PM, mar.krzeminski <mar.krzeminski@gmail.com>
wrote:

> Hello,
>
> Have you try to add chardev device?
>
> -chardev stdio,mux=on,id=terminal -serial chardev:terminal
>
> I am also not sure if you so many consoles in kernel command line,
> since you do not want to use any graphic mode.
>
> Regards,
> Marcin
>
>
> W dniu 11.06.2016 o 16:22, David Craven pisze:
>
> Hello qemu devs,
>>
>> I previously asked this question on stack overflow but didn't get an
>> answer, so I thought I'd ask here:
>>
>> Stdio doesn't show in qemu with the -nographic option.
>> This is my qemu invocation. It prints hello world when
>> using `-serial stdio` but only displays kernel output when
>> using `-nographic`. (From the docs I gather these two are
>> mutually exclusive options)
>>
>> ```
>>      qemu-system-arm \
>>          -kernel zImage \
>>          -append "\
>>              console=ttyAMA0,115200 console=tty highres=off console=ttyS0
>> \
>>              rdinit=/bin/static-hello \
>>              panic=1" \
>>          -initrd rootfs.cpio.gz \
>>          -dtb vexpress-v2p-ca9.dtb \
>>          -M vexpress-a9 \
>>          -m 512 \
>>          -nographic \
>>          -no-reboot
>> ```
>>
>> How do I get this to work with the `-nographic` option?
>>
>> David
>>
>>
>>
>