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

From: Avi Kivity
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 10:11:31 +0300
User-agent: Mozilla/5.0 (X11; Linux i686 on x86_64; rv:6.0.2) Gecko/20110906 Thunderbird/6.0.2

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?

I have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain.

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