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Re: [Qemu-devel] [PATCH v3 5/6] vga: Use linear mapping + dirty logging

From: Jan Kiszka
Subject: Re: [Qemu-devel] [PATCH v3 5/6] vga: Use linear mapping + dirty logging in chain 4 memory access mode
Date: Wed, 14 Sep 2011 10:02:44 +0200
User-agent: Mozilla/5.0 (X11; U; Linux i686 (x86_64); de; rv: Gecko/20080226 SUSE/ Thunderbird/ Mnenhy/

On 2011-09-14 09:42, Alexander Graf wrote:
> On 14.09.2011, at 09:11, Avi Kivity wrote:
>> On 09/13/2011 10:39 PM, Blue Swirl wrote:
>>>>  Here is the problem: Both the vram and the ISA range get mapped into
>>>>  system address space, but the former eclipses the latter as it shows up
>>>>  earlier in the list and has the same priority. This picture changes with
>>>>  the chain-4 alias which has prio 2, thus maps over the vram.
>>>>  It looks to me like the ISA address space is either misplaced at
>>>>  0x80000000 or is not supposed to be mapped at all on PPC. Comments?
>>> Since there is no PCI-ISA bridge, ISA address space shouldn't exist.
>> Where does the vga device sit then?
> On the PCI bus? :)

Then make sure that the container for ISA resources is a dummy region -
or even NULL so that VGA will know that it's supposed to skip ISA


Siemens AG, Corporate Technology, CT T DE IT 1
Corporate Competence Center Embedded Linux

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