[Regression] acpi_rsdp doesn't work in 3.12.{5-6}

[Regression] acpi_rsdp doesn't work in 3.12.{5-6}

[Vadim A. Misbakh-Soloviov]

Hello there!
Unfortunately I've server, that requires to manually point kernel to RSDP-
table. Otherwise ACPI doesn't work properly and kernel limits processors to 1.

All the time until upgrade to 3.12.5/3.12.6 I did it by specifying 
acpi_rsdp=0x7F1F7000 to the kernel cmdline (where 0x7F1F7000 is real address 
of RSDP table) and all worked fine. But now, after the upgrade, kernel can't 
find RSDP table anyway, even with redefinition in cmdline, and so it prints
> [    0.000000] ACPI BIOS Error (bug): A valid RSDP was not found 
(20130725/tbxfroot-212)
And boots just like I don't specified real RSDT table address for it (with 1 
processor and with broken acpi functionality).

As far, as I investigated, probleam appeared after 
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=40031da445fb4d269af9c7c445b2adf674f171e7

Unfortunately, I can't fully bisect it and get exact place.

Can you advice me, if it is possible to redefine RSDP table now, in 3.12, and 
how? And if it should use same syntax — why it stop working?

-- 
Best regsrds,
mva
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Re: [Regression] acpi_rsdp doesn't work in 3.12.{5-6}

[Rafael J. Wysocki]

On Sunday, December 29, 2013 05:34:46 PM Vadim A. Misbakh-Soloviov wrote:
> Hello there!
> Unfortunately I've server, that requires to manually point kernel to RSDP-
> table. Otherwise ACPI doesn't work properly and kernel limits processors to 1.
> 
> All the time until upgrade to 3.12.5/3.12.6 I did it by specifying 
> acpi_rsdp=0x7F1F7000 to the kernel cmdline (where 0x7F1F7000 is real address 
> of RSDP table) and all worked fine. But now, after the upgrade, kernel can't 
> find RSDP table anyway, even with redefinition in cmdline, and so it prints
> > [    0.000000] ACPI BIOS Error (bug): A valid RSDP was not found 
> (20130725/tbxfroot-212)
> And boots just like I don't specified real RSDT table address for it (with 1 
> processor and with broken acpi functionality).
> 
> As far, as I investigated, probleam appeared after 
> http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=40031da445fb4d269af9c7c445b2adf674f171e7

This is a merge, so it covers a whole bunch of commits.

> Unfortunately, I can't fully bisect it and get exact place.
> 
> Can you advice me, if it is possible to redefine RSDP table now, in 3.12, and 
> how? And if it should use same syntax — why it stop working?

Can you please check if commit afdca01c9821 (Merge branch 'acpica') works for you?

Rafael

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