Issue #598 has been updated by Dawid Wrobel.
I flashed the stock BIOS and the system boots just fine. dmidecode shows:
```
Handle 0x003C, DMI type 17, 40 bytes
Memory Device
Array Handle: 0x003B
Error Information Handle: Not Provided
Total Width: 64 bits
Data Width: 64 bits
Size: 32 GB
Form Factor: SODIMM
Set: None
Locator: ChannelA-DIMM0
Bank Locator: BANK 0
Type: DDR4
Type Detail: Synchronous
Speed: 3200 MT/s
Manufacturer: Micron
Serial Number: EB37855C
Asset Tag: 9876543210
Part Number: CT32G4SFD832A.M16FF
Rank: 2
Configured Memory Speed: 2400 MT/s
Minimum Voltage: 1.2 V
Maximum Voltage: 1.2 V
Configured Voltage: 1.2 V
Handle 0x003D, DMI type 17, 40 bytes
Memory Device
Array Handle: 0x003B
Error Information Handle: Not Provided
Total Width: 64 bits
Data Width: 64 bits
Size: 32 GB
Form Factor: SODIMM
Set: None
Locator: ChannelB-DIMM0
Bank Locator: BANK 2
Type: DDR4
Type Detail: Synchronous
Speed: 3200 MT/s
Manufacturer: Micron
Serial Number: EB3779C4
Asset Tag: 9876543210
Part Number: CT32G4SFD832A.M16FF
Rank: 2
Configured Memory Speed: 2400 MT/s
Minimum Voltage: 1.2 V
Maximum Voltage: 1.2 V
Configured Voltage: 1.2 V
```
----------------------------------------
Bug #598: Lenovo m920x RAM compatibility issue
https://ticket.coreboot.org/issues/598#change-2106
* Author: Dawid Wrobel
* Status: New
* Priority: Normal
* Target version: none
* Start date: 2025-06-04
* Affected versions: main
----------------------------------------
Hi there,
I recently flashed my m902x with coreboot (25.03-643-g69a067a9d62c-dirty).
Everything seemed to work fine until I tried upgrading the memory from a single
8GB stick to 2 x 32GB (Crucial CT2K32G4SFD832A,
https://eu.crucial.com/memory/ddr4/CT2K32G4SFD832A). The system won't boot in
any configuration (a single stick in either slot or both).
I get no display out, the system stays on and stuck, apparently, with high CPU
usage causing fans to kick in.
I have no serial port in this system at the moment (backordered an extension
module), but am wondering if it will be of any help and if there's any other
way to debug it?
Do note that the system *is* capable of running 64GB memory, as it was reported
already, so I wonder if this is a matter of some SPD misconfiguration?
Crucial lists the 2x16GB modules as compatible with this system
(https://eu.crucial.com/compatible-upgrade-for/lenovo/thinkcentre-m920x-tiny#memory)
and they have seemingly identical specs as the 2x32GB ones.
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