Philipp Deppenwiese submitted this change.
soc/intel/xeon_sp/cpx: skip DRHD generation for non-PCIe stack
Without skipping of DRHD generation for non-PCIe stack, the OS
kernel detects incorrect DMAR table with following messages:
[ 0.561817] Your BIOS is broken; DMAR reported at address 0
Signed-off-by: Jonathan Zhang <jonzhang@fb.com>
Change-Id: I098605daf12a264f390613581427ec722afcddaf
Reviewed-on: https://review.coreboot.org/c/coreboot/+/45887
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
---
M src/soc/intel/xeon_sp/cpx/soc_acpi.c
1 file changed, 4 insertions(+), 0 deletions(-)
diff --git a/src/soc/intel/xeon_sp/cpx/soc_acpi.c b/src/soc/intel/xeon_sp/cpx/soc_acpi.c
index b0352d8..a9af4aa 100644
--- a/src/soc/intel/xeon_sp/cpx/soc_acpi.c
+++ b/src/soc/intel/xeon_sp/cpx/soc_acpi.c
@@ -457,6 +457,10 @@
printk(BIOS_SPEW, "%s socket: %d, stack: %d, bus: 0x%x, pcie_seg: 0x%x, reg_base: 0x%x\n",
__func__, socket, stack, bus, pcie_seg, reg_base);
+ /* Do not generate DRHD for non-PCIe stack */
+ if (!reg_base)
+ return current;
+
// Add DRHD Hardware Unit
if (socket == 0 && stack == CSTACK) {
printk(BIOS_DEBUG, "[Hardware Unit Definition] Flags: 0x%x, PCI Segment Number: 0x%x, "
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