1 files changed, 38 insertions, 0 deletions
diff --git a/resources/libreboot/patch/kgpe-d16/0133-mainboard-asus-kgpe-d16-Limit-HT-speed-to-2.6GHz.patch b/resources/libreboot/patch/kgpe-d16/0133-mainboard-asus-kgpe-d16-Limit-HT-speed-to-2.6GHz.patch
new file mode 100644
index 0000000..f314aad
--- /dev/null
+++ b/resources/libreboot/patch/kgpe-d16/0133-mainboard-asus-kgpe-d16-Limit-HT-speed-to-2.6GHz.patch
@@ -0,0 +1,38 @@
+From 66fffccceee09c2bffb7ad2de7159cb7e9bbae72 Mon Sep 17 00:00:00 2001
+From: Timothy Pearson <kb9vqf@pearsoncomputing.net>
+Date: Thu, 3 Sep 2015 17:39:51 -0500
+Subject: [PATCH 133/146] mainboard/asus/kgpe-d16: Limit HT speed to 2.6GHz
+
+The CPU <--> CPU HT wiring on this board has only been validated
+to 2.6GHz.  While higher frequencies appear to function initially,
+and in fact function when only one CPU package is installed, dual
+CPU package systems will lock up after around 6 - 12 hours of uptime
+due to presumed HT link errors at the higher (>= 2.8GHz) HT clocks.
+
+If applications are not being used that stress the coherent fabric,
+then the uptime before hang may be much longer.  Users attempting
+to overclock the HT links are advised to "burn in test" the HT links
+by running memtester locked to a node with no local memory installed.
+---
+ src/mainboard/asus/kgpe-d16/romstage.c |    5 +++++
+ 1 file changed, 5 insertions(+)
+
+diff --git a/src/mainboard/asus/kgpe-d16/romstage.c b/src/mainboard/asus/kgpe-d16/romstage.c
+index 6b5d801..61b3f09 100644
+--- a/src/mainboard/asus/kgpe-d16/romstage.c
++++ b/src/mainboard/asus/kgpe-d16/romstage.c
+@@ -349,6 +349,11 @@ void cache_as_ram_main(unsigned long bist, unsigned long cpu_init_detectedx)
+ 
+ 	struct sys_info *sysinfo = &sysinfo_car;
+ 
++	/* Limit the maximum HT speed to 2.6GHz to prevent lockups
++	 * due to HT CPU <--> CPU wiring not being validated to 3.2GHz
++	 */
++	sysinfo->ht_link_cfg.ht_speed_limit = 2600;
++
+ 	uint32_t bsp_apicid = 0, val;
+ 	uint8_t byte;
+ 	msr_t msr;
+-- 
+1.7.9.5
+