diff options
| author | Timothy Pearson <tpearson@raptorengineeringinc.com> | 2015-08-28 15:31:31 -0500 |
|---|---|---|
| committer | Patrick Georgi <pgeorgi@google.com> | 2015-11-26 10:46:04 +0100 |
| commit | 905507c3790829e8a6352d857bbad446e6c1c4e6 (patch) | |
| tree | 76ab07397a2f93af81e9a8dda301142aa31b3b02 /src | |
| parent | 4fcc9f2e54fa243a60f667b490c9f4a77261c30e (diff) | |
| download | coreboot-905507c3790829e8a6352d857bbad446e6c1c4e6.tar.xz | |
southbridge/amd/sb700: Fix drifting system clock
Change-Id: I1698c9b9b1840d254115821f3c0e76b7211e9056
Signed-off-by: Timothy Pearson <tpearson@raptorengineeringinc.com>
Reviewed-on: https://review.coreboot.org/12052
Tested-by: build bot (Jenkins)
Reviewed-by: Martin Roth <martinroth@google.com>
Diffstat (limited to 'src')
| -rw-r--r-- | src/southbridge/amd/sb700/early_setup.c | 14 |
1 files changed, 11 insertions, 3 deletions
diff --git a/src/southbridge/amd/sb700/early_setup.c b/src/southbridge/amd/sb700/early_setup.c index f109896ea3..f7e91207f5 100644 --- a/src/southbridge/amd/sb700/early_setup.c +++ b/src/southbridge/amd/sb700/early_setup.c @@ -427,10 +427,10 @@ 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, 0x0429b17e); /* Counter CLK period */ + byte |= 0x08; /* Hide HPET regs */ pci_write_config8(dev, 0x43, byte); /* Features Enable */ @@ -661,6 +661,14 @@ 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 } /* |