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Advanced Setup CBI/CGI Technical Reference
Chassis Plans5-8
Three options are available:
• Select Disabled to disable both L1 internal cache memory on the SBC and
L2 secondary cache memory.
• Select WriteThru to use the write-through caching algorithm.
• Select WriteBack to use the write-back caching algorithm.
External Cache
This option specifies the caching algorithm used for L2 cache memory. If the Internal
Cache option described above is set to Disabled, this option is not available for modifi-
cation.
The Setup screen displays the system option:
External Cache WriteBack
Three options are available:
• Select Disabled to disable L2 cache memory.
• Select WriteThru to use the write-through caching algorithm.
• Select WriteBack to use the write-back caching algorithm.
System BIOS Cacheable
The System BIOS, which is in the F000H memory segment, is automatically shadowed
to RAM for faster execution. This option indicates that this memory segment can be
read from or written to cache memory.
The Setup screen displays the system option:
System BIOS Cacheable Enabled
Available options are:
Disabled
Enabled
Video or Adapter ROM Shadow
ROM shadow is a technique in which BIOS code is copied from slower ROM to faster
RAM. The BIOS is then executed from the RAM.
Each option allows for a segment of 16KB to be shadowed from ROM to RAM. If one
of these options is enabled and there is BIOS code present in that particular segment, the
BIOS is shadowed.
Video BIOS shadowing may be done in two 16KB segments at C000H and C400H.
Enabling shadowing can speed up the operation of a machine because RAM can be