Subject: Re: ISA direct config of ACPI devices
To: None <>
From: Joerg Sonnenberger <>
List: tech-kern
Date: 11/23/2007 19:32:37
On Fri, Nov 23, 2007 at 07:21:21PM +0100, Matthias Drochner wrote:
> Mostly, but there are differences which can be important:
> -uses 32 address bits instead of 24
> -can busmaster DMA w/o the ISA DMA controller
> -uses a serial interrupt protocol which does more than
>  the 15 ISA interrupts, so one can't assume a 1:1 relationship
>  between LPC interrupts and 8259 inputs

You can assume the 1:1 mapping, but ignoring that, we already have at
least one such device supported. HPET at both amdpcib and ichlpcib. I
have a patch for that to make it use as full timer and that is
effectively a global interrupt in the ACPI sense.