diff options
Diffstat (limited to 'src/southbridge/nvidia/mcp55/early_setup_car.c')
| -rw-r--r-- | src/southbridge/nvidia/mcp55/early_setup_car.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/src/southbridge/nvidia/mcp55/early_setup_car.c b/src/southbridge/nvidia/mcp55/early_setup_car.c index 4970a4cf9a..d919610900 100644 --- a/src/southbridge/nvidia/mcp55/early_setup_car.c +++ b/src/southbridge/nvidia/mcp55/early_setup_car.c @@ -242,7 +242,17 @@ static void mcp55_early_setup(unsigned mcp55_num, unsigned *busn, RES_PCI_IO, PCI_ADDR(0, 6, 0, 0x74), 0xFFFFFFC0, 0x00000000, RES_PCI_IO, PCI_ADDR(0, 6, 0, 0xC0), 0x00000000, 0xCB8410DE, RES_PCI_IO, PCI_ADDR(0, 6, 0, 0xC4), 0xFFFFFFF8, 0x00000007, +#if IS_ENABLED(CONFIG_NORTHBRIDGE_AMD_AMDFAM10) + /* + * Avoid crash (complete with severe memory corruption!) during initial CAR boot + * in mcp55_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 #if CONFIG_MCP55_USE_AZA RES_PCI_IO, PCI_ADDR(0, 6, 1, 0x40), 0x00000000, 0xCB8410DE, |