DFI AM636-B - Manual (Page 63)

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BIOS Setup
Memory Hole
In order to improve system performance, certain space in memory can be re-
served for ISA cards. This memory must be mapped into the memory space
below 16MB. When enabled, the CPU assumes the 15-16MB memory range is
allocated to the hidden ISA address range instead of the actual system DRAM.
When disabled, the CPU assumes the 15-16MB address range actually contains
DRAM memory. If more than 16MB of system memory is installed, this field must
be disabled to provide contiguous system memory.
System BIOS Cacheable
When this field is enabled, accesses to the system BIOS ROM addressed at
F0000H-FFFFFH are cached, provided that the cache controller is enabled. The
larger the range of the Cache RAM, the higher the efficiency of the system.