Rudolf Marek (r.marek@assembler.cz) just uploaded a new patch set to gerrit, which you can find at http://review.coreboot.org/69
-gerrit
commit f65442a479a1ace2badd1dcf2a5efd3e13dd226d Author: Rudolf Marek r.marek@assembler.cz Date: Wed Jun 29 23:59:13 2011 +0200
We use LDTSTOP# to trigger the FID/VID change on K8M890, because the FID/VID SMAF is blocked by not yet configured internal VGA. Workaround the errata #181. The memory controller is enabled later, nor the workaround makes any harm to non-affected CPUs.
Change-Id: Icf5d126b8c8cd9ece6af41d3129315a777c8cef2 Signed-off-by: Rudolf Marek r.marek@assembler.cz --- src/mainboard/asus/m2v-mx_se/romstage.c | 7 ++++++- 1 files changed, 6 insertions(+), 1 deletions(-)
diff --git a/src/mainboard/asus/m2v-mx_se/romstage.c b/src/mainboard/asus/m2v-mx_se/romstage.c index 580d8fa..6498e46 100644 --- a/src/mainboard/asus/m2v-mx_se/romstage.c +++ b/src/mainboard/asus/m2v-mx_se/romstage.c @@ -74,10 +74,15 @@ static inline int spd_read_byte(unsigned device, unsigned address)
#define SB_VFSMAF 0
-/* this function might fail on some K8 CPUs with errata #181 */ static void ldtstop_sb(void) { print_debug("toggle LDTSTP#\n"); + + /* fix errata #181, disable DRAM controller it will get enabled later */ + tmp = pci_read_config8(PCI_DEV(0, 0x18, 2), 0x94); + tmp |= (( 1 << 14) | (1 << 3)); + pci_write_config8(PCI_DEV(0, 0x18, 2), 0x94, tmp); + u8 reg = inb (VT8237R_ACPI_IO_BASE + 0x5c); reg = reg ^ (1 << 0); outb(reg, VT8237R_ACPI_IO_BASE + 0x5c);