Technical Announcement on Changing the Organization Option to 'Shared' in AMD Genoa Server BIOS May Lead to System Hang or Abnormal Reboot

I.        Product Model

H3C Uniserver R3950 G6

H3C Uniserver R4950 G6

H3C Uniserver R5350 G6

H3C Uniserver R5500 G6

H3C Uniserver R3950 G7 + Genoa CPU

H3C Uniserver R3350 G7 + Genoa CPU

H3C Uniserver R4950 G7 + Genoa CPU

H3C Uniserver R5350 G7 + Genoa CPU

BIOS (G6 Models + Genoa): M50-BIOS-6.30.44 and all earlier versions

BIOS (G7 Models + Genoa): M50-BIOS-6.30.44-Dual BIOS and all earlier versions

Changing the Advanced -> AMD CBS -> DF Common Options -> Probe Filter -> Organization option to "Shared" may cause the processor to generate an EX WDT (Watchdog Timeout) MCA error, leading to system hang or unexpected reboot.

This change has been confirmed to trigger an architectural limitation of the AMD processor, resulting in abnormal behavior.

H3C recommends setting the Advanced -> AMD CBS -> DF Common Options -> Probe Filter -> Organization option to "Dedicated" and not changing it to "Shared", as this will trigger the issue. "Dedicated" means that multiple memory/CXL channels do not share probe filter storage, while "Shared" indicates that they can.

Currently, AMD has not provided an official solution for this issue. To prevent faults due to misoperation, H3C will temporarily hide the "Shared" option in the Organization setting in the upcoming BIOS version M50-BIOS-6.30.45. If it is necessary to change the Organization option to "Shared", please contact H3C technical support.