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Chapter 7: BIOS
7-9
Cache Base 0-512K
If enabled, this feature will allow the data stored in the base memory block 0-512K
to be cached (written) into a buffer, a storage area in the Static DROM (SDROM)
or to be written into the L1/L2 cache inside the CPU to speed up CPU operations.
Select Uncached to disable this function. Select Write Through to allow data to be
cached into the buffer and written into the system memory at the same time. Select
Write Protect to prevent data from being written into the base memory area of Block
0-512K. Select Write Back to allow the CPU to write data back directly from the buffer
without writing data to the System Memory for fast CPU data processing and opera-
tion. The options are Uncached, Write Through, Write Protect and Write Back.
Cache Base 512K-640K
If enabled, this feature will allow the data stored in the memory area 512K-640K
to be cached (written) into a buffer, a storage area in the Static DROM (SDROM)
or written into the L1/L2/L3 cache inside the CPU to speed up CPU operations.
Select Uncached to disable this function. Select Write Through to allow data to
be cached into the buffer and written into the system memory at the same time.
Select Write Protect to prevent data from being written into the base memory area
of Block 512-640K. Select Write Back to allow the CPU to write data back directly
from the buffer without writing data to the System Memory for fast CPU data pro-
cessing and operation. The options are Uncached, Write Through, Write Protect
and Write Back.
Cache Extended Memory
If enabled, this feature will allow the data stored in the extended memory area to
be cached (written) into a buffer, a storage area in the Static DROM (SDROM) or
written into the L1/L2/L3 cache inside the CPU to speed up CPU operations. Select
Uncached to disable this function. Select Write Through to allow data to be cached
into the buffer and written into the system memory at the same time. Select Write
Protect to prevent data from being written into the extended memory area above
1MB. Select Write Back to allow the CPU to write data back directly from the buffer
without writing data to the System Memory for fast CPU data processing and opera-
tion. The options are Uncached, Write Through, Write Protect and Write Back.
Discrete MTRR Allocation
If enabled, MTRRs (Memory Type Range Registers) are confi gured as distinct
separate units and cannot be overlapped. If enabled, the user can achieve better
graphic effects when using a Linux graphic driver that requires the write-combining
confi guration with 4GB or more memory. The options are Enabled and Disabled.