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Re: [Qemu-ppc] [Qemu-devel] ppc vga output breakage since commit c3c1bb9


From: Paolo Bonzini
Subject: Re: [Qemu-ppc] [Qemu-devel] ppc vga output breakage since commit c3c1bb99
Date: Mon, 30 Mar 2015 12:28:58 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.5.0


On 30/03/2015 12:20, Mark Cave-Ayland wrote:
>> > 
>> > Of course, there's a QEMU regression too and I'm thinking of how to fix it.
> Hmmm that's interesting because the documentation refers to both
> registers being 16-bit: http://wiki.osdev.org/Bochs_VBE_Extensions. And
> indeed the pseudo-code uses outpw/inpw for accesses, even though the
> index and data registers are only 1 byte apart (0x1ce and 0x1cf) in I/O
> space.

Ugh, you're right.

> Maybe OpenBIOS is getting the endian conversion incorrect for the word
> access? (i.e. it's not converting to little endian).

No, that's not it.  It's basically treating the whole access as
"unassigned" because 0x1cf is not allocated (on non-x86 machines, the
DISPI data port is at 0x1d0).

Paolo



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