TYAN S5211, Manual

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program writes into this memory area, it will result in a system crash. So, it is
recommended that you write protect this area for optimal system performance.
Options: NULL /
Write Protect
Cache Base 0-512K
Control caching of 512K base memory.
Options: Write Through / Write Back
Cache Base 512-640K
Control caching of 512K-640K base memory.
Options: Write Through / Write Back
Cache Extended Memory Area
Control caching of system memory above one megabyte.
Options: Write Through / Write Back
Cache A000-AFFF~ Cache DC00-DFFF
Control caching of the memory blocks.
Options: Disabled / Write Back/ Write Through / Write Protect