Building ACPI for PPC architecture

Building ACPI for PPC architecture

[rajeshprabhu72721]

We are trying to build ACPI for PPC e300 core . The problem is we donot have a BIOS running to supply the System Descriptor Tables to ACPI during boot. So ACPI gets disabled during boot. Are the system desc tables must for the ACPI to run? Or is there a method where we can avoid these tables and make ACPI work directly. Without BIOS how do we make ACPI up and running?















Have you checked out the new-look www.indiatimes.com yet?Have you checked out the new-look www.indiatimes.com yet?

Re: Building ACPI for PPC architecture

[Alexey Starikovskiy]

You should try to build ACPI CA interpreter in user-space for your architecture first.
Get it here: http://www.intel.com/technology/iapc/acpi/downloads.htm
There is a big chance that you will find too many endian issues.

Regards,
	Alex.

rajeshprabhu72721 wrote:
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> We are trying to build ACPI for PPC e300 core . The problem is we donot have a BIOS running to supply the System Descriptor Tables to ACPI during boot. So ACPI gets disabled during boot. Are the system desc tables must for the ACPI to run? Or is there a method where we can avoid these tables and make ACPI work directly. Without BIOS how do we make ACPI up and running?
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> Have you checked out the new-look www.indiatimes.com yet?Have you checked out the new-look www.indiatimes.com yet?
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Re: Building ACPI for PPC architecture

[Bjorn Helgaas]

On Monday 23 October 2006 04:36, Alexey Starikovskiy wrote:
> You should try to build ACPI CA interpreter in user-space for your architecture first.
> Get it here: http://www.intel.com/technology/iapc/acpi/downloads.htm
> There is a big chance that you will find too many endian issues.

That is certainly an issue.  I think HP-UX used to run the CA in
big-endian mode, so they probably sorted out some of the issues.
But I think it was an ongoing headache, so they finally gave up and
wrote wrappers to run the CA in little-endian mode while the rest
of the OS runs in big-endian mode.

Bjorn

Re: [linux-pm] Building ACPI for PPC architecture

[Paul Mackerras]

rajeshprabhu72721 writes:

> We are trying to build ACPI for PPC e300 core . The problem is we

Why?  What problem do you think that will solve?

> donot have a BIOS running to supply the System Descriptor Tables to
> ACPI during boot. So ACPI gets disabled during boot. Are the system
> desc tables must for the ACPI to run? Or is there a method where we
> can avoid these tables and make ACPI work directly. Without BIOS how
> do we make ACPI up and running?

ACPI is a bad idea (see Linus Torvalds' rants about ACPI in the
linux-kernel mailing list archives for the reasons).  Fortunately no
PowerPC platform has tried to implement it.  If nothing else, the
endianness difference would make it impracticable.

Paul.