Manual Number: 40110-005-2
Page 62
Three options are available:
•
Select Disabled to disable both L1 internal cache memory on the processor board and L2
secondary cache memory.
•
Select WriteBack to use the write-back caching algorithm.
•
Select WriteThru to use the write-through 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 L2
secondary 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 shad-
owed.
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 accessed more rapidly
than ROM and the data bus is wider to RAM. The default setting for the video BIOS segments is
Cached .
Other 16KB ROM segments may be shadowed in the memory area from C800H to E000H, depend-
ing upon preferences and system requirements. The ROM area that is not used by ISA adapter
cards is allocated to PCI adapter cards.
The Setup screen displays the system option:
XXXX,16K Shadow
Disabled
where XXXX is the base address of the segment of memory to be shadowed.
Summary of Contents for SB686P Series
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