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Re: [PATCH] Import updates from i386's i8259.c

To: "Maciej W. Rozycki" <macro@linux-mips.org>
Subject: Re: [PATCH] Import updates from i386's i8259.c
From: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Date: Wed, 06 Dec 2006 18:48:54 +0300
Cc: Ingo Molnar <mingo@redhat.com>, anemo@mba.sphere.ne.jp, Ralf Baechle <ralf@linux-mips.org>, linux-mips@linux-mips.org
In-reply-to: <Pine.LNX.4.64N.0612061525580.29000@blysk.ds.pg.gda.pl>
Organization: MontaVista Software Inc.
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References: <20061206.103923.71086192.nemoto@toshiba-tops.co.jp> <20061206015818.GB27985@linux-mips.org> <20061206.115602.63741871.nemoto@toshiba-tops.co.jp> <20061206.133836.89067271.nemoto@toshiba-tops.co.jp> <4576C2E9.4060900@ru.mvista.com> <Pine.LNX.4.64N.0612061337220.29000@blysk.ds.pg.gda.pl> <4576CB64.2060705@ru.mvista.com> <Pine.LNX.4.64N.0612061438440.29000@blysk.ds.pg.gda.pl> <4576DDEC.1050105@ru.mvista.com> <Pine.LNX.4.64N.0612061525580.29000@blysk.ds.pg.gda.pl>
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Hello.

Maciej W. Rozycki wrote:

  As for the I/O APIC, I think i82903AA was "the reference design" for it...

Nope, it was the i82489DX -- the original "discrete" coupled Local & I/O APIC using a five-wire inter-APIC bus and a protocol different from later implementations.

Hm, that's news to me. I always thought that chip was external *local* APIC only... Well, there's no docs on it anyway.

Then there were ones included in the i82379AB (SIO.A) and i82374EB/SB (ESC) chipset components. They used a three-wire bus and a new protocol. And only then came the i82093AA.

   Aha, you're probably correct here. I forgot about those early chipssets.

  Maciej

WBR, Sergei

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