From owner-freebsd-current  Tue Oct  2  1:15:56 2001
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From: Maxim Sobolev <sobomax@FreeBSD.ORG>
Message-Id: <200110020814.f928EHV73680@vega.vega.com>
Subject: Re: ACPI: problem with fdc resource allocation
To: iwasaki@jp.FreeBSD.org (Mitsuru IWASAKI)
Date: Tue, 2 Oct 2001 11:13:37 +0300 (EEST)
Cc: sobomax@FreeBSD.ORG, ache@nagual.pp.ru, msmith@FreeBSD.ORG,
	current@FreeBSD.ORG, acpi-jp@jp.FreeBSD.org
In-Reply-To: <no.id> from "Mitsuru IWASAKI" at Oct 02, 2001 11:10:45 AM
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> 
> Hi, I've just made a workaround for this.  Intel folks, could you review
> it as always?
> 
> > The problem is here, right?
> > > can't fetch resources for \\_SB_.PCI0.ISA_.FDC0 - AE_AML_BUFFER_LIMIT
> > 
> > I'm sure _SB_.PCI0.ISA_.FDC0._CRS (Current Resource Settings) have some
> > problems (not sure in BIOS or ACPICA yet).  I could reproduce the problem
> > which you reported.  Trace attached in this mail.
> [snip]
> > dsopcode-0677 [09] DsEvalBufferFieldOpera: Field size 208 exceeds Buffer size 192 (bits)
> > PsExecute: method failed - \_SB_.PCI0.ISA_.FDC0._CRS (0x8098fa8)
> > Execution of \_SB_.PCI0.ISA_.FDC0._CRS failed with status AE_AML_BUFFER_LIMIT
> 
> This method is like this;
>                 Method(_CRS) {
>                     Name(BUF0, Buffer(0x18) {0x47, 0x1, 0xf2, 0x3, 0xf2, 0x3,
> 			       0x0, 0x4, 0x47, 0x1, 0xf7, 0x3, 0xf7, 0x3, 0x0,
> 			       0x1, 0x22, 0x40, 0x0, 0x2a, 0x4, 0x0, 0x79, 0x0 })
>                     CreateByteField(BUF0, 0x2, IOLO)
>                     CreateByteField(BUF0, 0x3, IOHI)
>                     CreateByteField(BUF0, 0x4, IORL)
>                     CreateByteField(BUF0, 0x5, IORH)
>                     CreateByteField(BUF0, 0x19, IRQL)
>                     CreateByteField(BUF0, 0x1c, DMAV)
>                     Return(BUF0)
>                 }
> 
> The problem is that this AML is trying to create a field at exceeded
> position (0x19) of the Buffer (size is 0x18).
> I couldn't find how AML interprepter treat this in ACPI Spec. so I'm
> not sure wether AWRDACPI violates the Spec. or ACPICA can have a workaround
> for this.
> Anyway, I made a patch to reallocate a large enough buffer for the
> requested operation.

Yes, that patch fixed the problem, thank you!

-Maxim

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