Date: Wed, 24 Oct 2001 17:32:22 +0300 From: Maxim Sobolev <sobomax@FreeBSD.org> To: Mitsuru IWASAKI <iwasaki@jp.freebsd.org> Cc: acpi-jp@jp.freebsd.org, msmith@FreeBSD.org, ache@nagual.pp.ru, current@FreeBSD.org Subject: Re: [acpi-jp 1363] Re: ACPI: problem with fdc resource allocation Message-ID: <3BD6D0F6.6E642FF4@FreeBSD.org> References: <no.id> <200110240837.f9O8bAV99173@vega.vega.com> <20011024.221200.104029670.iwasaki@jp.FreeBSD.org>
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Mitsuru IWASAKI wrote:
>
> Hi, Maxim. Thanks for reporting and reminding us.
>
> I think this is very difficult to fix, because;
> 1. Basically, this is a bug in BIOS, should be reported to vendor.
I understood that, but it is a discontinued model, so it is
unlikely that they will bother to provide updated BIOS just
to satisfy those strange that want to run FreeBSD on it. :((
> 2. ACPI CA is developed by Intel. We'd like to have less local
> workaround changes as possible.
Ok, I see.
> 3. I'm not sure whether suggested patches (buffer size dynamicaly expanding)
> in [acpi-jp 1315] is correct fix, maybe not. Probably another approach
> can be considered (e.g. just ignore AE_AML_BUFFER_LIMIT and continue
> interpreter execution).
>
> I'll describe again the problem. 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).
> And strangely, this method just return the buffer w/o any changes
> after CreateByteField operations. I guess that BIOS writer forgotten to
> delete CreateByteField statements, or change the buffer size.
>
> Now that we have DSDT override patches;
> http://home.jp.freebsd.org/cgi-bin/showmail/acpi-jp/1347
> or
> http://home.jp.freebsd.org/cgi-bin/showmail/acpi-jp/1349
>
> and AML disassembler (acpidump), and ASL compiler (iasl) in
> ports/devel/acpicatools/.
>
> Maxim, could you apply the following patches and try DSDT overriding?
Looks like a way to go. I'll test them tomorrow and let you
know then.
Big thanks!
-Maxim
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