Issue #598 has been reported by Dawid Wrobel.

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Bug #598: Lenovo m920x RAM compatibility issue
https://ticket.coreboot.org/issues/598

* Author: Dawid Wrobel
* Status: New
* Priority: Normal
* Target version: none
* Start date: 2025-06-04
* Affected versions: main
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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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