Aaeon SBC-670S Manual page 47

These options control the location of the contents of the 16KB of
ROM beginning at the specified memory location. If no adapter
ROM is using the named ROM area, this area is made available to
the local bus. The settings are:
Setting
Enabled
Cached
Disabled
Description
The contents of C 0000h - C3FFFh are written to the
same address in system memory (RAM
execution.
The contents of the named ROM area are written to
the same address in system memory (RAM) for
faster execution, if an adapter ROM will be using the
named ROM area. Also, the contents of the RAM
area can be read from and written to cache memory.
The video ROM is not copied to RAM. The contents
of the video ROM cannot be read from or written to
cache memory.
) for faster