[PATCH] drm/bochs: convert bochs driver to atomic mode-setting

[John Hunter]

Hi Gerd,
I have tried what you told me.
1. Turn off fbdev support:
    static bool enable_fbdev = *false*;
2. configure a serial console:
    - add something like "*console=ttyS0, 9600n8*" to the grub menuentry
    - add a start parameter to qemu when start the virtual machine "*-serial
pty*"
    - got a redirected device like "*char device redirected to /dev/pts/2*"
    - see the vritual machine's kernel messages in a host console by typing
"*cat /dev/pts/2*"

And stuck in dark but got the messages bellow:

saned disabled; edit /etc/default/saned
[ ok ] Starting network connection manager: NetworkManager.
[ ok ] Starting Common Unix Printing System: cupsd.

The serial console messages also stop here, no other output.

I just don't know if I did the right thing, if I did something wrong, I
would be appreaciate if
you show me.

Best Regards,
Zhao


On Wed, Jun 10, 2015 at 4:15 PM, John Hunter <zhjwpku at gmail.com> wrote:

> Thanks for the information, I will try that : )
>
> On Wed, Jun 10, 2015 at 4:04 PM, Gerd Hoffmann <kraxel at redhat.com> wrote:
>
>>   Hi,
>>
>> > As far as I know, the convertion got some problem, and after I
>> > add the bochs driver when I boot the qemu VM, it just can not
>> > start up, works fine if I delete bochs-drm.ko from it's directory.
>>
>> With fbdev enabled alot initialization happens with some important
>> console lock taken, which has the effect that you don't see any kernel
>> messages until it all succeeded.  If it doesn't succeed you are stuck in
>> the dark.  Guess this is what happened ...
>>
>> So, configure a serial console for your virtual machine.
>> Turn off fbdev support (bochs_drm has a module option for that).
>> That most likely gives you a clue where things blow up.
>>
>> Then get X11 running.
>> kmscon is a nice test too.
>> When all this works try turning fbdev back on.
>>
>> HTH,
>>   Gerd
>>
>>
>>
>
>
> --
> Best regards
> Junwang Zhao
> Microprocessor Research and Develop Center
> Department of Computer Science &Technology
> Peking University
> Beijing, 100871, PRC
>



-- 
Best regards
Junwang Zhao
Microprocessor Research and Develop Center
Department of Computer Science &Technology
Peking University
Beijing, 100871, PRC
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