diff options
Diffstat (limited to 'resources/libreboot/patch/kgpe-d16/0121-southbridge-amd-sb700-Fix-drifting-system-clock.patch')
| -rw-r--r-- | resources/libreboot/patch/kgpe-d16/0121-southbridge-amd-sb700-Fix-drifting-system-clock.patch | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/resources/libreboot/patch/kgpe-d16/0121-southbridge-amd-sb700-Fix-drifting-system-clock.patch b/resources/libreboot/patch/kgpe-d16/0121-southbridge-amd-sb700-Fix-drifting-system-clock.patch new file mode 100644 index 00000000..996ac031 --- /dev/null +++ b/resources/libreboot/patch/kgpe-d16/0121-southbridge-amd-sb700-Fix-drifting-system-clock.patch @@ -0,0 +1,45 @@ +From 4042f73651a2f55642357c98c0476db2a01af830 Mon Sep 17 00:00:00 2001 +From: Timothy Pearson <kb9vqf@pearsoncomputing.net> +Date: Fri, 28 Aug 2015 15:31:31 -0500 +Subject: [PATCH 121/146] southbridge/amd/sb700: Fix drifting system clock + +--- + src/southbridge/amd/sb700/early_setup.c | 14 +++++++++++--- + 1 file changed, 11 insertions(+), 3 deletions(-) + +diff --git a/src/southbridge/amd/sb700/early_setup.c b/src/southbridge/amd/sb700/early_setup.c +index 1f92a4e..f98e5c7 100644 +--- a/src/southbridge/amd/sb700/early_setup.c ++++ b/src/southbridge/amd/sb700/early_setup.c +@@ -431,10 +431,10 @@ static void sb700_devices_por_init(void) + + /* Configure HPET Counter CLK period */ + byte = pci_read_config8(dev, 0x43); +- byte &= 0xF7; /* unhide HPET regs */ ++ byte &= 0xF7; /* Unhide HPET regs */ + pci_write_config8(dev, 0x43, byte); +- pci_write_config32(dev, 0x34, 0x0429B17E ); /* Counter CLK period */ +- byte |= 0x08; /* hide HPET regs */ ++ pci_write_config32(dev, 0x34, 0xb0); /* HPET_CNTRL = 0xb0 */ ++ byte |= 0x08; /* Hide HPET regs */ + pci_write_config8(dev, 0x43, byte); + + /* Features Enable */ +@@ -669,6 +669,14 @@ static void sb700_pmio_por_init(void) + byte = pmio_read(0xbb); + byte |= 0xc0; + pmio_write(0xbb, byte); ++ ++#if CONFIG_SOUTHBRIDGE_AMD_SUBTYPE_SP5100 ++ /* Work around system clock drift issues */ ++ byte = pmio_read(0xd4); ++ byte |= 0x1 << 6; /* Enable alternate 14MHz clock source */ ++ byte |= 0x1 << 7; /* Disable 25MHz oscillator buffer */ ++ pmio_write(0xd4, byte); ++#endif + } + + /* +-- +1.7.9.5 + |