TYAN TEMPEST I5000XL Manual page 43

Cache System BIOS Area
This feature is only available when the system BIOS is shadowed. It enables or
disables the caching of the system BIOS ROM at F0000h-FFFFFh via the L2 cache.
This greatly speeds up accesses to the system BIOS. However, this does not
necessarily make the system perform better because the OS does not need to
access the system BIOS often.
As such, it would be a waste of L2 cache bandwidth to cache the system BIOS
instead of data that are more critical to the system's performance. In addition, if any
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.
Uncached / Write Protect
Cache Video BIOS Area
This feature is only valid when the video BIOS is shadowed. It enables or disables
the caching of the video BIOS ROM at C0000h-C7FFFh via the L2 cache. This
greatly speeds up accesses to the video BIOS. However, this does not necessarily
make the system perform better because the OS bypasses the BIOS and uses the
graphics driver to access the video card's hardware directly.
As such, it would be a waste of L2 cache bandwidth to cache the video BIOS
instead of data that are more critical to the system's performance. In addition, if any
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.
Uncached / Write Protect
Cache Base 0-512K
This feature allows you to control caching of 512K base memory.
Uncached / Write Through / Write Protect / Write Back
Cache Base 512-640K
This feature allows you to control caching of 512K 640K base memory.
Uncached / Write Through / Write Protect / Write Back
Cache Extended Memory Area
This feature allows you to control caching of system memory above one megabyte.
Uncached / Write Through / Write Protect / Write Back
Cache A000-AFFF/B000-BFFF
These features allow you to control caching of A000-AFFF/B000-BFFF memory.
Disabled / USMC Caching / Write Through / Write Protect / Write Back
Cahe C8000-CBFF/Cache CC00-CFFF
These features allow you to control caching of C8000-CBFF/CC00-CFFF memory.
Disabled / Write Through / Write Protect / Write Back
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