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amd/amdfam10: Allocate the lower DRAM region up to TOM 

This fixes the resource allocator locating the PCI register
space below 0xe0000000 thereby causing corruption with more
than ~3.5GB physical RAM on AMD Family 10h systems.

Change-Id: I66d1bfa1e977a6b492c1909079087a801c7e6a3a
Signed-off-by: Timothy Pearson <tpearson@raptorengineeringinc.com>
Reviewed-on: http://review.coreboot.org/8261
Reviewed-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
Tested-by: build bot (Jenkins)
This commit is contained in:
Timothy Pearson 2015-01-23 20:20:56 -06:00 committed by Alexandru Gagniuc
parent 7f3ae39640
commit a6f669e183
1 changed files with 3 additions and 0 deletions
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3
src/northbridge/amd/amdfam10/northbridge.c
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@ -677,6 +677,9 @@ static void amdfam10_domain_read_resources(device_t dev)
res->size = CONFIG_MMCONF_BUS_NUMBER * 4096*256;
res->flags = IORESOURCE_MEM | IORESOURCE_RESERVE |
IORESOURCE_FIXED | IORESOURCE_STORED | IORESOURCE_ASSIGNED;
/* Reserve lower DRAM region to force PCI MMIO region to correct location above 0xefffffff */
ram_resource(dev, 7, 0, rdmsr(TOP_MEM).lo >> 10);
#endif
}