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Re: [Qemu-devel] [PATCH 00/24] Alpha system emulation, v2

From: Tristan Gingold
Subject: Re: [Qemu-devel] [PATCH 00/24] Alpha system emulation, v2
Date: Wed, 20 Apr 2011 17:46:13 +0200

On Apr 20, 2011, at 4:46 PM, Richard Henderson wrote:

> On 04/20/2011 02:06 AM, Tristan Gingold wrote:
>> * sx164 is ev56 based, isn't it ?  It would be nice if cpu version specific 
>> code is clearly marked.
> Yes, but most importantly it is the most evolved of the single hose systems.
> QEMU is nowhere near ready to deal with multiple PCI host controllers, and
> multiple ISA buses.

Right, but you could create an ev67 machine with a single PCI controller (or 
put all the devices on the same
PCI controller).

> I actually planned on emulating an EV67 but using the SX164 HW.  I think the
> Linux kernel will be that forgiving...
>>  In particular (and IIRC), pal mode for ev6 is much closer to ev4 than to 
>> ev5.  Don't know about ev7.
>>  It would be nice if we could easily support both ev5 and ev6.
> Ah, see, here's where there may be some confusion...
> I'm not implementing any of the real cpu ISRs.  I'm not using any of the real
> PALcode.  I'm implementing my own QEMU-specific ISRs and and writing my own
> PALcode, starting with MILO's PALcode but I've diverged significantly since.

Ah, ok I understand.  I fear that if you implement your own ISR, you will only 
be able to boot linux...
which I suppose is your primary target.  OTOH, it will be much faster than a 
native ISR.


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