coreboot

Hello all,

it seem, that disabling
Processor type and features
-> [ ] SMT (Hyperthreading) scheduler support
solves my problem.
I have four CPUs running and I don't have any freezes.

Yes, it's the same problem with #121.

I'm now trying to test if it has something to do with the H8 config. I extracted the H8 related devicetree items with autoport on an iGPU T520, and patch as the following:

diff --git a/src/mainboard/lenovo/t520/variants/t520/devicetree.cb b/src/mainboard/lenovo/t520/variants/t520/devicetree.cb
index 97350f3c27..1c40e32a90 100644
--- a/src/mainboard/lenovo/t520/variants/t520/devicetree.cb
+++ b/src/mainboard/lenovo/t520/variants/t520/devicetree.cb
@@ -108,24 +108,21 @@ chip northbridge/intel/sandybridge
                                                io 0x66 = 0x1604
                                        end

-                                       register "config0" = "0xa7"
-                                       register "config1" = "0x09"
+                                       register "config0" = "0xa6"
+                                       register "config1" = "0x01"
                                        register "config2" = "0xa0"
-                                       register "config3" = "0xc2"
+                                       register "config3" = "0xc4"

-                                       register "beepmask0" = "0x00"
-                                       register "beepmask1" = "0x86"
+                                       register "beepmask0" = "0xfe"
+                                       register "beepmask1" = "0x96"
                                        register "has_power_management_beeps" = "0"
                                        register "event2_enable" = "0xff"
                                        register "event3_enable" = "0xff"
                                        register "event4_enable" = "0xd0"
-                                       register "event5_enable" = "0xfc"
-                                       register "event6_enable" = "0x00"
-                                       register "event7_enable" = "0x01"
+                                       register "event5_enable" = "0x3c"
+                                       register "event7_enable" = "0x81"
                                        register "event8_enable" = "0x7b"
                                        register "event9_enable" = "0xff"
-                                       register "eventa_enable" = "0x01"
-                                       register "eventb_enable" = "0x00"
                                        register "eventc_enable" = "0xff"
                                        register "eventd_enable" = "0xff"
                                        register "evente_enable" = "0x0d"

It looks like that it can solve the problem, but still needs testing.

I have applied the above patch on:
src/mainboard/lenovo/t520/variants/t520/devicetree.cb

In the last week I had only two freezes. This is definitive better than without the patch.
Interestingly the freezes okkur only when the laptop is under almost no load or IDLE.

It doesn't completely solved the freezes for me either after I applied that patch for days.
Recently, I found that if I use the bottom of the left two USB ports, the system will likely freeze.

Interestingly the freezes okkur only when the laptop is under almost no load or IDLE.

Right, I found this when I first used T520 with coreboot years ago. But it can also freeze when the load is high.

Hello,

it seems in my case a RAM-Upgrade solved the problem.

Please see Ticket 120 [[[https://ticket.coreboot.org/issues/121]]] for details.

Cheers
Martin