Dave Frodin ([email protected]) just uploaded a new patch set to gerrit, 
which you can find at http://review.coreboot.org/1161

-gerrit

commit d2dcdb021028d090187d55132cf9f6da9ff9e21d
Author: Dave Frodin <[email protected]>
Date:   Mon Jul 2 14:31:53 2012 -0600

    AMD/Mahogany_Fam10: Allow 64 bit version of Windows to boot.
    
    This removes the HPET from the ACPI tables and fixes the
    legacy VGA entry.
    
    Change-Id: I632356945ff7886078c87eb179730cc6d569ff0f
    Signed-off-by: Dave Frodin <[email protected]>
---
 src/mainboard/amd/mahogany_fam10/acpi_tables.c |    5 ++++-
 src/mainboard/amd/mahogany_fam10/dsdt.asl      |    6 +++---
 2 files changed, 7 insertions(+), 4 deletions(-)

diff --git a/src/mainboard/amd/mahogany_fam10/acpi_tables.c 
b/src/mainboard/amd/mahogany_fam10/acpi_tables.c
index 5e48bbe..503493c 100644
--- a/src/mainboard/amd/mahogany_fam10/acpi_tables.c
+++ b/src/mainboard/amd/mahogany_fam10/acpi_tables.c
@@ -114,7 +114,7 @@ unsigned long write_acpi_tables(unsigned long start)
        unsigned long current;
        acpi_rsdp_t *rsdp;
        acpi_rsdt_t *rsdt;
-       acpi_hpet_t *hpet;
+/*     acpi_hpet_t *hpet; */
        acpi_madt_t *madt;
        acpi_srat_t *srat;
        acpi_slit_t *slit;
@@ -168,6 +168,8 @@ unsigned long write_acpi_tables(unsigned long start)
        acpi_create_fadt(fadt, facs, dsdt);
        acpi_add_table(rsdp, fadt);
 
+#if 0
+       having the HPET table present will cause a BSOD in 64 bit version of 
windows
        /*
         * We explicitly add these tables later on:
         */
@@ -177,6 +179,7 @@ unsigned long write_acpi_tables(unsigned long start)
        current += sizeof(acpi_hpet_t);
        acpi_create_hpet(hpet);
        acpi_add_table(rsdp, hpet);
+#endif
 
        /* If we want to use HPET Timers Linux wants an MADT */
        current = ALIGN(current, 8);
diff --git a/src/mainboard/amd/mahogany_fam10/dsdt.asl 
b/src/mainboard/amd/mahogany_fam10/dsdt.asl
index b7e2a4a..bc67ea3 100644
--- a/src/mainboard/amd/mahogany_fam10/dsdt.asl
+++ b/src/mainboard/amd/mahogany_fam10/dsdt.asl
@@ -37,7 +37,7 @@ DefinitionBlock (
        Name(PBLN, 0x0) /* Length of BIOS area */
 
        Name(PCBA, CONFIG_MMCONF_BASE_ADDRESS)  /* Base address of PCIe config 
space */
-       Name(HPBA, 0xFED00000)  /* Base address of HPET table */
+       /* Name(HPBA, 0xFED00000) causes a BSOD in 64 bit version of windows */ 
/* Base address of HPET table */
 
        Name(SSFG, 0x0D)                /* S1 support: bit 0, S2 Support: bit 
1, etc. S0 & S5 assumed */
 
@@ -933,7 +933,7 @@ DefinitionBlock (
                /* DBGO(" to S0\n") */
 
                /* Re-enable HPET */
-               Store(1,HPDE)
+               /*      Store(1,HPDE)  this will cause a BSOD in 64 bit version 
of Windows */
 
                /* Restore PCIRST# so it resets USB */
                if (LEqual(Arg0,3)){
@@ -1545,9 +1545,9 @@ DefinitionBlock (
                                        0xF300                  /* length */
                                )
 
-                               Memory32Fixed(READWRITE, 0, 0xA0000, BSMM)
                                Memory32Fixed(READONLY, 0x000A0000, 0x00020000, 
VGAM)   /* VGA memory space */
 #if 0
+                               Memory32Fixed(READWRITE, 0, 0xA0000, BSMM)
                                Memory32Fixed(READONLY, 0x000C0000, 0x00020000, 
EMM1)   /* Assume C0000-E0000 empty */
                                Memory32Fixed(READONLY, 0x000E0000, 0x00020000, 
RDBS)   /* BIOS ROM area */
 

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