Changing Dma Memory Settings - Matrox 4Sight User Manual

90 Chapter 7: Additions to the Matrox 4Sight integrated unit

Changing DMA memory settings

At the factory, Matrox 4Sight's memory settings were
configured as follows:
Total Physical Memory reserved for Video Memory = 3584
Kbytes (3.5 Mb)
Total Physical Memory reserved for MIL DMA Buffers = 3584
Kbytes (3.5 Mb)
Total Physical Memory available for Windows NT Embedded
= 58368 Kbytes (57 Mb)
To change the DMA memory size according to your application's
requirements, use the Mildrv utility (MILDrv.exe), as follows:
MILDRV MTXDMA [DMASIZE] –PCMEMORYSIZE=[SYSSIZE] –UPDATE
Replace [DMASIZE] with the amount of DMA memory, in
Kbytes, to reserve for DMA buffers (grab buffers). Replace
[SYSSIZE] with the amount of physical memory (RAM)
installed on Matrox 4Sight minus the amount used as video
memory (Matrox 4Sight uses part of physical memory as video
memory (graphics display memory)). The default amount used
as video memory is 3.5 Mbytes and is always located at the top
of physical memory. This means that [SYSSIZE] must be set to
61952 for a 64 Mbytes unit or 127488 for a 128 Mbytes unit.
For example, to reserve 3.5 Mbytes for DMA buffers on a 64
Mbytes computer, use the following command (leaving 57
Mbytes for Windows NT Embedded to run):
MILDRV MTXDMA 3584 -PCMEMORYSIZE = 61952 -UPDATE
For a 128 Mbyte computer, use the following command:
MILDRV MTXDMA 3584 -PCMEMORYSIZE = 127488 -UPDATE
You can use NTConfig with the /MEM option to obtain
information on Matrox 4Sight's memory settings.
There is one option in the BIOS Setup program that allows you
to reserve specific amounts of video memory from the available
external memory. Once you reserve video memory, it is no
longer counted as available external memory. As mentioned,