[SOLVED][Goldmont Plus] Kernel panic when inserting corefreqk

[N0tACyb0rg]

System Info:

• CPU: Intel Pentium Silver N5000 @ 1.10 GHz
• RAM: 8 GB
• OS: Arch Linux
• Kernel: Linux 6.1.1-arch1-1
• CoreFreq Version: 1.94.0

I compiled from the develop branch with the provided make command for Intel systems: make MSR_CORE_PERF_UC=MSR_CORE_PERF_FIXED_CTR1 MSR_CORE_PERF_URC=MSR_CORE_PERF_FIXED_CTR2. I then attempted to insert corefreqk.ko using sudo insmod corefreqk.ko and got a kernel panic. I tried testing it by inserting it using the suggestion in #227, sudo insmod corefreqk.ko ArchID=11 and got a segmentation fault instead of a kernel panic. Here's the log for that from dmesg: pastebin.

[cyring]

I don't see other DID to query than 0x31f0. Shadow register does not help either; I wonder if other software are able to list the memory controller ? Are you getting something from memtestx86 or CPUZ, OCCT, HWINFO ?

[N0tACyb0rg]

Here is an output from dmidecode

# dmidecode 3.4
Getting SMBIOS data from sysfs.
SMBIOS 3.1.1 present.

Handle 0x0025, DMI type 16, 23 bytes
Physical Memory Array
        Location: System Board Or Motherboard
        Use: System Memory
        Error Correction Type: None
        Maximum Capacity: 8 GB
        Error Information Handle: Not Provided
        Number Of Devices: 2

Handle 0x0027, DMI type 17, 40 bytes
Memory Device
        Array Handle: 0x0025
        Error Information Handle: Not Provided
        Total Width: 16 bits
        Data Width: 16 bits
        Size: 8 GB
        Form Factor: DIMM
        Set: None
        Locator: A1_DIMM0
        Bank Locator: A1_BANK0
        Type: DDR4
        Type Detail: Synchronous
        Speed: 2400 MT/s
        Manufacturer: Hynix
        Serial Number: 0000
        Asset Tag: 9876543210
        Part Number: 0000000000-00000
        Rank: Unknown
        Configured Memory Speed: 2400 MT/s
        Minimum Voltage: 44.975 V
        Maximum Voltage: 44.975 V
        Configured Voltage: 1.5 V

Handle 0x0029, DMI type 17, 40 bytes
Memory Device
        Array Handle: 0x0025
        Error Information Handle: Not Provided
        Total Width: Unknown
        Data Width: 64 bits
        Size: No Module Installed
        Form Factor: DIMM
        Set: None
        Locator: A1_DIMM1
        Bank Locator: A1_BANK1
        Type: DDR2
        Type Detail: Synchronous

[N0tACyb0rg]

Here is another output from the command lshw -short -C memory:

H/W path       Device  Class          Description
=================================================
/0/0                   memory         64KiB BIOS
/0/25                  memory         8GiB System Memory
/0/25/0                memory         8GiB DIMM DDR4 Synchronous 2400 MHz (0.4 ns)
/0/25/1                memory         DIMM DDR2 Synchronous [empty]
/0/3f                  memory         224KiB L1 cache
/0/40                  memory         4MiB L2 cache

[cyring]

Thanks but dmidecode, lshw are instrumentations based: SMBIOS, DMI, SPD for their lowest access level.

CoreFreq is Registers based; directly to the Memory Controller registers.

Memtest86+ is also one of the few Linux software which decodes IMC

https://github.com/memtest86plus/memtest86plus

If you are successfully reading the primary timings from Memtest86+ then MCHBAR or another IMC protocol is feasible for CoreFreq Memtest86+ is bootable, please take a photo if possible.

[cyring]

Hello,

In addition to Memtest86+, could you check if there is no BIOS option which locks the PCI MCH from being accessed ?

[cyring]

MCHBAR moved to #395