[CentOS] detecting ECC errors?

How do you detect ECC memory errors when CentOS is booted?

Just had a strange hardware error where a server machine hang during
anaconda install
it passed memtest86 test but the bios dmi log showed dimm bank 1b had
failures.

Now I wonder what would happen if a machine running in production would get
such
problems, how do you detect it without having to go into bios?

Hints on what to use?
Chris
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