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[Xen-devel] no output on console when using 2.6.39 as dom0-kernel

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Subject: [Xen-devel] no output on console when using 2.6.39 as dom0-kernel
From: Ronny Hegewald <ronny.hegewald@xxxxxxxxx>
Date: Mon, 30 May 2011 19:18:27 +0000
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This topic was brought up before for the 2.6.38 kernel one month ago 


In this thread it wasn't mentioned that upstream has some missing 
functionality for vga-console support (as far i have seen), so i assume that 
it should work.

First my config: xen 4.1, 2.6.39 upstream linux-kernel, both 32-bit

As soon the dom0-kernel is booting all output is cleared and the screen stays 
black, but the kernel is booting fine and i can login and start programs etc.

When i start X in the dom0 the output on the screen appears normally. As soon 
i finish X, the screen turns black again.

I added the following patch to the 2.6.39-er kernel, and the output on the 
console works fine for me on 32 and 64 bit dom0 kernel (the following patches 
are from Jeremys xen repository). 

        commit 09e5e7caf4eac83c010ec3d209cc3dfbe1444ae0 
        Date:   Mon Feb 9 12:05:54 2009 -0800          
        xen: allow enable use of VGA console on dom0

There was another patch to make the vga-console work with 32-bit-kernel. But 
for me it worked without it.

        commit adec49def29110b1748a861c8a2cee785a0d1052
        Date:   Mon Apr 27 13:03:13 2009 -0700                      
        xen/i386: make sure initial VGA/ISA mappings are not overridden

Or ss the console suppossed to work without this patches?

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