AOpen AP53 User Manual page 51

AMI BIOS Utility
Peer Concurrency
Enable the parameter to allow the CPU to run secondary DRAM PCI master
cycles to target PCI peer devices. Select Disabled to hold the CPU bus.
The default setting is Disabled .
Memory Error Check Mode
BIOS automatically detects the memory error check mode supported by the
secondary cache installed in your system. Therefore, this parameter is
nonconfigurable and is for display only.
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