10-22-2018 02:22 AM
The Ryzen Pros in the A485 are qualified for ECC support. Can Lenovo enable this support in a BIOS update? 16GB ECC SODIMMs (Lenovo # 4X70Q27989) are recognised by the system but there's no option in the BIOS to enable ECC.
05-18-2019 08:18 AM
AFAIK, this requires 8 extra pins to be connected, that usually aren't connected and tracerouted (since escape routing and fanout from a massive BGA is probably hard enough).
Are we certain the 8 ECC pins are wired up?
05-21-2019 12:20 PM - edited 05-21-2019 12:24 PM
Yes, I believe you're right. The same thought occurred to me. I couldn't tell when I had the pcb out. I think we'd need a comment from somebody at lenovo on this.
All I know is my desktop ryzen has ecc in it and working from day one. I'd kind of expect this feature from a "pro" business oriented laptop. A few extra traces and a few extra bios entries aren't that much extra effort. If I had to guess i'd think the traces being there is likely, a "just in case" design choice.
In linux it just says ecc disabled by bios when I attempt to load the module. The memory is detected as being and supporting ecc however. I knew it didn't have ecc when I purchased it, but I wanted ryzen (which supports ecc) and was hopefull they'd add an updated bios for this feature like others have done.
Any lenovo employees care to respond ?