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| author | Jonathan A. Kollasch <jakllsch@kollasch.net> | 2015-07-20 09:51:34 -0500 |
|---|---|---|
| committer | Jonathan A. Kollasch <jakllsch@kollasch.net> | 2015-07-23 18:30:19 +0200 |
| commit | acba73aefcbd7dacb547b61570a1836b745be2e5 (patch) | |
| tree | 098ebd932670930651541536405d1f9b4548161d /src/southbridge/nvidia/ck804/early_setup_car.c | |
| parent | ff40196c6c5a83b7cf2ceeb2dd027d4f2587b94a (diff) | |
| download | coreboot-acba73aefcbd7dacb547b61570a1836b745be2e5.tar.gz coreboot-acba73aefcbd7dacb547b61570a1836b745be2e5.tar.bz2 coreboot-acba73aefcbd7dacb547b61570a1836b745be2e5.zip | |
nvidia southbridges: don't touch 0x78 in LPC bridge with Fam10h
Based on the observations that AMD Fam10h with both Nvidia CK804 (Asus
KFSN4-DRE) and MCP55 (Sun Ultra 40 M2) need to avoid adjusting the LPC
bridge register 0x78 (particularly the 0x7b byte) to get to ramstage:
Assume that there's something about this register that adjusting it the
way we do for K8 is something that can/should be universally avoided on
all Fam10h systems with these chipsets.
Change-Id: I1eceeb20ecaefef4c61c11e19d1f5a59f91a0a2f
Signed-off-by: Jonathan A. Kollasch <jakllsch@kollasch.net>
Reviewed-on: http://review.coreboot.org/10984
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Tested-by: build bot (Jenkins)
Reviewed-by: Timothy Pearson <tpearson@raptorengineeringinc.com>
Diffstat (limited to 'src/southbridge/nvidia/ck804/early_setup_car.c')
| -rw-r--r-- | src/southbridge/nvidia/ck804/early_setup_car.c | 14 |
1 files changed, 13 insertions, 1 deletions
diff --git a/src/southbridge/nvidia/ck804/early_setup_car.c b/src/southbridge/nvidia/ck804/early_setup_car.c index 8065d20fdb4b..87fdbdd4d681 100644 --- a/src/southbridge/nvidia/ck804/early_setup_car.c +++ b/src/southbridge/nvidia/ck804/early_setup_car.c @@ -142,7 +142,15 @@ static void ck804_early_setup(unsigned ck804_num, unsigned *busn, CK804_MB_SETUP #endif -#ifndef CK804_SKIP_PCI_REG_78_INIT +#if IS_ENABLED(CONFIG_NORTHBRIDGE_AMD_AMDFAM10) + /* + * Avoid crash (complete with severe memory corruption!) during initial CAR boot + * in ck804_early_setup_x() on Fam10h systems by not touching 0x78. + * Interestingly once the system is fully booted into Linux this can be set, but + * not before! Apparently something isn't initialized but the amount of effort + * required to fix this is non-negligible and of unknown real-world benefit + */ +#else RES_PCI_IO, PCI_ADDR(0, 1, 0, 0x78), 0xc0ffffff, 0x19000000, #endif RES_PCI_IO, PCI_ADDR(0, 1, 0, 0xe0), 0xfffffeff, 0x00000100, @@ -239,6 +247,10 @@ static void ck804_early_setup(unsigned ck804_num, unsigned *busn, RES_PCI_IO, PCI_ADDR(0, 9, 0, 0x4c), 0xfe00ffff, 0x00440000, RES_PCI_IO, PCI_ADDR(0, 9, 0, 0x74), 0xffffffc0, 0x00000000, + /* + * Avoid touching 0x78 for CONFIG_NORTHBRIDGE_AMD_AMDFAM10 for + * non-primary chains too??? + */ RES_PCI_IO, PCI_ADDR(0, 1, 0, 0x78), 0xc0ffffff, 0x20000000, RES_PCI_IO, PCI_ADDR(0, 1, 0, 0xe0), 0xfffffeff, 0x00000000, RES_PCI_IO, PCI_ADDR(0, 1, 0, 0xe8), 0xffffff00, 0x000000ff, |