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Chapter 7: BIOS
Type
This option sets the type of device that the AMIBIOS attempts to boot
from after AMIBIOS POST is completed. The settings include Not in-
stalled, Auto, CDROM and ARMD. The "Auto" setting allows BIOS to
automatically detect the presence of the IDE controller.
LBA/Large Mode
LBA (Logical Block Addressing) is a method of addressing data on a
disk drive. In LBA mode, the maximum drive capacity is 137 GB. The
settings are Disabled and Auto. Select "Disabled" to disable LBA
mode. Select "Auto" to enable LBA mode if your device supports it
and is not already formatted with the LBA mode.
Block (Multi-Sector Transfer) Mode
This option sets the block mode multi sector transfers option. The
settings include Disabled and Auto. Disabled: This option prevents
the BIOS from using Multi-Sector Transfer on the specified channel.
The data to and from the device will occur one sector at a time. Auto:
This option allows the BIOS to auto detect device support for Multi-
Sector Transfers on the specified channel. If supported, this option
allows the BIOS to auto detect the number of sectors per block for
transfer from the hard disk drive to memory. The data transfer to and
from the device will occur multiple sectors at a time (if the device
supports it).
PIO Mode
IDE PIO (Programmable I/O) mode programs timing cycles between the
IDE drive and the programmable IDE controller. As the PIO mode in-
creases, the cycle time decreases. The settings are: Auto, 0, 1, 2, 3
and 4.
DMA Mode
This item allows the users to select the DMA mode. The settings are:
Auto, SWDMA0, SWDMA1, SWDMA2, MWDMA0, MWDMA1, MWDM2,
UWDMA0, UWDMA1, UWDMA2, UWDMA3 and UWDMA4. Select Auto
to auto detect the DMA Mode. Select SWDMA0 through SWDMA2 to
set single word DMA0 through DMA2. Select MWDMA0 through
MWDMA2 to set Multi-word DMA0 through DMA2. Select UDMA0
through UDMA4 to set Ultra DMA0 through Ultra DMA4.
7-7
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