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From b398fb43bb4ebc4d8d8c77e07e14b747971c39b4 Mon Sep 17 00:00:00 2001
From: Timothy Pearson <tpearson@raptorengineeringinc.com>
Date: Thu, 20 Aug 2015 15:53:25 -0500
Subject: [PATCH 123/143] northbridge/amd/amdfam10: Work around sporadic
lockups when CC6 enabled
Change-Id: If31140651f25f9c524a824b2da552ce3690eae18
Signed-off-by: Timothy Pearson <tpearson@raptorengineeringinc.com>
---
src/northbridge/amd/amdfam10/northbridge.c | 14 ++++++++++++++
1 file changed, 14 insertions(+)
diff --git a/src/northbridge/amd/amdfam10/northbridge.c b/src/northbridge/amd/amdfam10/northbridge.c
index 740fd79..433a21c 100644
--- a/src/northbridge/amd/amdfam10/northbridge.c
+++ b/src/northbridge/amd/amdfam10/northbridge.c
@@ -814,6 +814,20 @@ static void amdfam10_domain_read_resources(device_t dev)
else
qword = 0x1000000;
+ /* FIXME
+ * The BKDG appears to be incorrect as to the location of the CC6 save region
+ * lower boundary on non-interleaved systems, causing lockups on attempted write
+ * to the CC6 save region.
+ *
+ * For now, work around by allocating the maximum possible CC6 save region size.
+ *
+ * Determine if this is a BKDG error or a setup problem and remove this warning!
+ */
+ qword = (0x1 << 27);
+ max_range_limit = (((uint64_t)(pci_read_config32(get_node_pci(max_node, 1), 0x124) & 0x1fffff)) << 27) - 1;
+
+ printk(BIOS_INFO, "Reserving CC6 save segment base: %08llx size: %08llx\n", (max_range_limit + 1), qword);
+
/* Reserve the CC6 save segment */
reserved_ram_resource(dev, 8, (max_range_limit + 1) >> 10, qword >> 10);
}
--
1.7.9.5
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