[coreboot] TOM2 and M4A785T-M

[Marc Jones]

On Thu, Jan 5, 2012 at 9:19 AM, Denis 'GNUtoo' Carikli
<GNUtoo at no-log.org> wrote:
> Hi, is it normal that TOM2 is 0 on the M4A785T-M mainboard?
>
> Here are the logs from coreboot:
> --------------------------------------------
> Sysmem TOM = 0_80000000
> Sysmem TOM2 = 0_0
> [...]
> Setting fixed MTRRs(0-88) type: UC
> Setting fixed MTRRs(0-16) Type: WB, RdMEM, WrMEM
> Setting fixed MTRRs(24-88) Type: WB, RdMEM, WrMEM
> DONE fixed MTRRs
> Setting variable MTRR 0, base:    0MB, range: 2048MB, type WB
> ADDRESS_MASK_HIGH=0xffff
> Setting variable MTRR 1, base: 1792MB, range:  256MB, type UC
> ADDRESS_MASK_HIGH=0xffff
> DONE variable MTRRs
> Clear out the extra MTRR's
> call enable_var_mtrr()
> Leave x86_setup_var_mtrrs
>
> MTRR check
> Fixed MTRRs   : Enabled
> Variable MTRRs: Enabled
>
>
> And from the linux kernel:
> -----------------------------------
> [    0.312294] mtrr: your CPUs had inconsistent variable MTRR settings
> [    0.312295] mtrr: probably your BIOS does not setup all CPUs.
> [    0.312296] mtrr: corrected configuration.
> [...]
> [    0.317404] ACPI: Executed 2 blocks of module-level executable AML code
> [    0.383560] ACPI: Interpreter enabled
> [    0.384025] ACPI: (supports S0 S1 S2 S3 S4 S5)
> [    0.392816] ACPI: BIOS offers _BFS
> [    0.396026] ACPI: If "acpi.bfs=1" improves resume, please notify linux-
> acpi at vger.kernel.org
> [    0.400025] ACPI: Using IOAPIC for interrupt routing
> [    0.432761] ACPI: Power Resource [PFN0] (on)
> [    0.444081] ACPI: No dock devices found.
> [    0.448028] HEST: Table not found.
> [    0.451490] PCI: Ignoring host bridge windows from ACPI; if necessary, use
> "pci=use_crs" and report a bug
> [    0.452071] ACPI Error: [TOM2] Namespace lookup failure, AE_NOT_FOUND
> (20110112/psargs-359)
> [    0.460029] ACPI Error: Method parse/execution failed [\_SB_.PCI0._CRS]
> (Node f4426e70), AE_NOT_FOUND (20110112/psparse-536)
> [    0.472033] [Firmware Bug]: ACPI: no secondary bus range in _CRS
> [    0.476035] ACPI: PCI Root Bridge [PCI0] (domain 0000 [bus 00-ff])
> [    0.480086] ACPI Error: [TOM2] Namespace lookup failure, AE_NOT_FOUND
> (20110112/psargs-359)
> [    0.492031] ACPI Error: Method parse/execution failed [\_SB_.PCI0._CRS]
> (Node f4426e70), AE_NOT_FOUND (20110112/psparse-536)
>
> Denis.
>

Hi Denis,

This is probably a failure in the mainboard ssdt. The dsdt has the
variable for TOM and TOM2 that are in an ssdt. You probably want to
add some debug code to acpi_tables.c to see what is getting loaded. It
looks like the method used in this mainboard is to copy a compile time
ssdt in. A better way is to generate the ssdt. The amd/mahogany or the
amd/persimmon acpi_tables.c have examples that generate the ssdt
table. You may want to start there.

Marc

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