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Date: Tue, 09 Feb 2010 18:31:03 -0600
From: Anthony Liguori <anthony@codemonkey.ws>
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Subject: Re: [Qemu-devel] Seabios dislikes -M isapc
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To: malc <av1474@comtv.ru>
Cc: qemu-devel@nongnu.org, Aurelien Jarno <aurelien@aurel32.net>

On 02/09/2010 06:27 PM, malc wrote:
> APIC is almost as good as useless without ACPI and we have a switch to
> disable that.
>    

Which is another thing that I'm not sure it all that useful to have.

>> Firmware is really hard to implement if you have to deal with supporting
>> multiple chipsets.
>>
>> Also, if we don't have a workload that actually needs isapc, that suggests
>> that there's no real way to test that isapc doesn't have non-ISA things creep
>> into it.
>>
>> Given that, I'm inclined to suggest that we mark isapc as deprecated, give
>> people some time to comment on it, and then provided that we still don't think
>> it's necessary, change isapc to simply use isa devices while still using a PCI
>> chipset.
>>      
> Not to comment, to give hard evidence that something is working with isapc
> and doesn't otherwise, in which case it must stay.
>    

Yes.  If someone can produce a workload that requires isapc[1], I'm all 
for continuing to support it.

[1] Very specifically, I mean requires -M isapc to only emulate an ISA 
bus and not emulate an ISA bus via a bridge in the PIIX chipset.  We 
will always need an -M isapc that only uses ISA devices instead of PCI 
devices.  However, if we can use a PCI chipset in -M isapc, we can 
express the differences entirely via qdev.

Regards,

Anthony Liguori