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Re: [Qemu-devel] [PATCH v3 14/14] i386: ACPI table generation code from

From: Gerd Hoffmann
Subject: Re: [Qemu-devel] [PATCH v3 14/14] i386: ACPI table generation code from seabios
Date: Fri, 26 Jul 2013 11:06:34 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130621 Thunderbird/17.0.7


>> You can look at the tables without doing a full linker pass first, so
>> the firmware can easily initialize the hardware according to what it
>> finds in specific acpi tables.  Check FADT for pm_base.  Check MCFG for
>> mmconf xbar location.
>> cheers,
>>   Gerd
> That's something I think that it's best for firmware to avoid.
> Much better to load tables in memory and use standard ACPI
> methods to find specific tables.

Problem is this happens relatively late in the firmware boot process.

> It's a general thing: paravirtualization is often easier
> but let's use standard interfaces where possible.

Sure.  Thats why I want read the info from the acpi tables.  Being able
to do that without a full acpi table linker pass makes this easier for
the firmware, especially for informations needed very early in the
initialization process.

What is wrong with etc/acpi/fadt ?

> Sticking everything in one file will serve to keep firmware
> honest and not let it cut corners.

Parse error.


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