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Re: [Xen-devel] console: introduce console=none option

On 26/01/12 14:41, Jan Beulich wrote:
>>>> On 26.01.12 at 13:19, Andrew Cooper <andrew.cooper3@xxxxxxxxxx> wrote:
>> XenServer by default boots without a serial console (buggy hardware
>> reasons) and dom0 displays a splash screen.  Unfortunately, having Xen
>> writing to the vga text area looks ugly whilst dom0 is trying to set up
>> non-text mode and display  the splash screen.
>> We have been using "console=" to prevent this behavior for a while, but
>> presented herewith is a patch to fix the problem correctly.
> While I don't mind the patch, I'm completely confused by the description:
> Where is it that Xen writes to VGA text area after control was passed to
> Dom0?
> Jan

I have not debugged it that much as I was looking for a clean solution
to our current hack of "console=" (and I have some rather more serious
deadlock bugs to debug), but it all Xen printk's are going into the VGA
text area, even after dom0 has started.  It is possible that Xen is
still writing into the text area after dom0 has switched VGA mode, but I
have no proof of this one way or the other.

Andrew Cooper - Dom0 Kernel Engineer, Citrix XenServer
T: +44 (0)1223 225 900, http://www.citrix.com

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