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-rw-r--r--src/northbridge/amd/amdk8/misc_control.c14
1 files changed, 13 insertions, 1 deletions
diff --git a/src/northbridge/amd/amdk8/misc_control.c b/src/northbridge/amd/amdk8/misc_control.c
index 045f5cef06..9d4e968267 100644
--- a/src/northbridge/amd/amdk8/misc_control.c
+++ b/src/northbridge/amd/amdk8/misc_control.c
@@ -50,7 +50,19 @@ static void misc_control_init(struct device *dev)
cmd = 0x04e20707;
pci_write_config32(dev, 0xd4, cmd );
}
-#if 1
+
+/*
+ * FIXME: This preprocessor check is a mere workaround.
+ * The right fix is to walk over all links on all nodes
+ * and set the FIFO read pointer optimization value to
+ * 0x25 for each link connected to an AMD HT device.
+ *
+ * The reason this is only enabled for machines with more
+ * than one CPU is that Athlon64 machines don't have the
+ * link at all that is optimized in the code.
+ */
+
+#if CONFIG_MAX_CPUS > 1
cmd = pci_read_config32(dev, 0xdc);
if((cmd & 0x0000ff00) != 0x02500) {
cmd &= 0xffff00ff;