Date: Wed, 16 Jul 1997 19:08:00 +0800 From: Peter Wemm <peter@spinner.dialix.com.au> To: Steve Passe <smp@csn.net> Cc: smp@FreeBSD.ORG Subject: Re: HEADS UP: EISA cards. Message-ID: <199707161108.TAA15825@spinner.dialix.com.au> In-Reply-To: Your message of "Tue, 15 Jul 1997 23:51:00 CST." <199707160551.XAA06975@Ilsa.StevesCafe.com>
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Steve Passe wrote:
> ...
> I believe that we don't want to abandon the 8254, but instead should
> abandon the DMA chaining INTs (who uses these anyways???) Then we
> can program in a similar way, but instead pass the 8254 INT thru as
> a regular INT.
> ...
> we need to make a policy decision as to whether we can say
> bye-bye to the DMA chaining INTs. If I don't get thoughtful feedback on this
> I will just nmake an arbitrary decision (which I suspect to be axing the DMA
> INTs). I think the only situation needing them is non-busmaster EISA hardwar
e
> that does DMA via the motherboard chipset DMA registers. Please correct me
> if I am wrong on this point.
I believe, that we don't support the DMA chaining interrupt in any way,
shape or form at present. I would not think it would be a big loss. I
think you are correct, it's only used for motherboard driven DMA.
Busmastering DMA (any EISA card worth using would do this anyway) is
unrelated to that. I vote for declaring it stillborn, especially as EISA
is apparently not on the "cool hardware of the day" list.
Cheers,
-Peter
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