diff options
Diffstat (limited to 'resources/libreboot/patch/kgpe-d16/0131-mainboard-asus-kgpe-d16-Limit-HT-speed-to-2.6GHz.patch')
| -rw-r--r-- | resources/libreboot/patch/kgpe-d16/0131-mainboard-asus-kgpe-d16-Limit-HT-speed-to-2.6GHz.patch | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/resources/libreboot/patch/kgpe-d16/0131-mainboard-asus-kgpe-d16-Limit-HT-speed-to-2.6GHz.patch b/resources/libreboot/patch/kgpe-d16/0131-mainboard-asus-kgpe-d16-Limit-HT-speed-to-2.6GHz.patch new file mode 100644 index 00000000..72d834ca --- /dev/null +++ b/resources/libreboot/patch/kgpe-d16/0131-mainboard-asus-kgpe-d16-Limit-HT-speed-to-2.6GHz.patch @@ -0,0 +1,41 @@ +From a3c83c34f3871be5624259a8a5d76bbae0386720 Mon Sep 17 00:00:00 2001 +From: Timothy Pearson <tpearson@raptorengineeringinc.com> +Date: Thu, 3 Sep 2015 17:39:51 -0500 +Subject: [PATCH 131/139] 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. + +Change-Id: I8fae90c67aa0e8b103e9b8906dea50d1e92ea5a9 +Signed-off-by: Timothy Pearson <tpearson@raptorengineeringinc.com> +--- + 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 d1b75b6..8f1ec35 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; +-- +1.9.1 + |