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

To: "Maciej W. Rozycki" <>
Subject: Re: [PATCH] Import updates from i386's i8259.c
From: Sergei Shtylyov <>
Date: Wed, 06 Dec 2006 18:48:54 +0300
Cc: Ingo Molnar <>,, Ralf Baechle <>,
In-reply-to: <>
Organization: MontaVista Software Inc.
Original-recipient: rfc822;
References: <> <> <> <> <> <> <> <> <> <>
User-agent: Mozilla/5.0 (X11; U; Linux i686; rv:1.7.2) Gecko/20040803

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.


WBR, Sergei

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