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nb/intel/haswell/finalize.c: Lock down MC ARB register 

The Haswell System Agent BIOS Spec revision 0.6.0 indicates this
register needs to be locked, and Broadwell already locks it.

Tested on Asrock B85M Pro4, still boots and register is locked.

Change-Id: Icdeb39e2fdde1403b6ab83faed214addca863f4b
Signed-off-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/46680
Reviewed-by: Nico Huber <nico.h@gmx.de>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
This commit is contained in:
Angel Pons 2020-10-23 11:00:14 +02:00
parent 97f0d81503
commit 8cc39a5fae
2 changed files with 2 additions and 0 deletions
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1
src/northbridge/intel/haswell/finalize.c
View File

@ -24,6 +24,7 @@ void intel_northbridge_haswell_finalize_smm(void)
MCHBAR32_OR(REQLIM, 1UL << 31); MCHBAR32_OR(REQLIM, 1UL << 31);
MCHBAR32_OR(DMIVCLIM, 1UL << 31); MCHBAR32_OR(DMIVCLIM, 1UL << 31);
MCHBAR32_OR(CRDTLCK, 1 << 0); MCHBAR32_OR(CRDTLCK, 1 << 0);
MCHBAR32_OR(MCARBLCK, 1 << 0);
/* Memory Controller Lockdown */ /* Memory Controller Lockdown */
MCHBAR8(MC_LOCK) = 0x8f; MCHBAR8(MC_LOCK) = 0x8f;

1
src/northbridge/intel/haswell/registers/mchbar.h
View File

@ -47,5 +47,6 @@
#define REQLIM 0x6800 #define REQLIM 0x6800
#define DMIVCLIM 0x7000 #define DMIVCLIM 0x7000
#define CRDTLCK 0x77fc #define CRDTLCK 0x77fc
#define MCARBLCK 0x7ffc
#endif /* __HASWELL_REGISTERS_MCHBAR_H__ */ #endif /* __HASWELL_REGISTERS_MCHBAR_H__ */