mismatch between FACP and chipset spec

[Rui Paulo]

On Thu, Feb 28, 2008 at 12:29 PM, Andriy Gapon <avg at icyb.net.ua> wrote:
> on 28/02/2008 11:52 Rui Paulo said the following:
>
>
> > On Thu, Feb 28, 2008 at 8:25 AM, Andriy Gapon <avg at icyb.net.ua> wrote:
>  >>  As some of you probably already know I have a motherboard based on
>  >>  440BX/PIIX4E chipset:
>  >>  http://www.geocities.com/SiliconValley/3686/delta_mp2.html
>  >>
>  >>  Here's some info from ACPI tables:
>  >>         PM1a_EVT_BLK=0x4000-0x4003
>  >>         PM1a_CNT_BLK=0x4040-0x4041
>  >>         PM_TMR_BLK=0x4008-0x400b
>  >>
>  >>  I know that in my case 0x4000 is a base address of "Power Management IO
>  >>  Space" (as defined by PIIX4 specification).
>  >>  I see that descriptions of the registers and their bits match between
>  >>  ACPI specification and PIIX4 specification for registers in PM1a_EVT_BLK
>  >>  (PMSTS and PMEN registers in PIIX4 parlance) and PM_TMR_BLK (PMTMP
>  >>  register in PIIX4 parlance).
>  >>  But addresses given for PM1a_CNT_BLK are not documented at all! On the
>  >>  other hand ACPI description of that register perfectly matches
>  >>  description of PIIX4 PMCNTRL register that is located at 0x4004 with a
>  >>  given base address. So, this is 0x4040 vs. 0x4004, looks like a possible
>  >>  typo/mistake by an author of ACPI tables for this motherboard.
>  >>
>  >>  Question: is there any way I can way override the address of
>  >>  PM1a_CNT_BLK? My guess is that there is zero chance that there would be
>  >>  any BIOS updates for this old and exotic motherboard (MP2-BX-X).
>  >
>  > Try dumping your ACPI tables, change the address and load the new
>  > tables on boot,
>  > http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/acpi-debug.html
>
>  I have some experience with that (and I've been planning to share it for
>  several years now).
>  My impression that only DSDT can be changed this way, not the fixed
>  tables. I could be wrong.

Yes, I failed to see that this was not the DSDT.

Sorry.
-- 
Rui Paulo