using the bootstrap loader

dma channel
dma base address
- -
dma _separation
scsi info
info
CONFIGURING THE FIRST STAGE
A BYTE that indicates which channel on the DMA
controller will be used. Specify the number of the DMA
channel as listed in the appropriate Intel data sheet.
A WORD that indicates the base I/O port address of
the DMA controller's registers.
A BYTE that indicates the number of bytes separating
consecutive ports on the DMA controller.
This parameter is iSBC-board-specific; it does not
depend on the SCSI driver's requirements. This
parameter is a BYTE which has the following meaning:
Value
o
1
2-255
Meaning
Indicates that no additional
information is needed to
configure the Bootstrap Loader
for the iSBC board you are using.
Indicates this configuration of the
Bootstrap Loader is used on the
iSBC 286/1 OOA board.
Reserved for future use.
Varies depending on the value of scsi_info.
If scsi_info is 0, then no other information is needed and
info is left blank.
If scsi info is 1, then info is a single WORD that
specifies the port address of the iSBC 286/100A port
used for multiplexing DMA sources into the on-board
82258 DMA component.
The SCSI driver can be used to bootstrap load from any random-access device on the SCSI
bus. The SCSI driver can also be used to bootstrap load from specific random-access
devices on the SASI bus. When using the SASI bus, you must select a specific device,
because the SASI devices require unique initialization information. Do this by specifying
unique unit information for each device on the SASI bus (the %SASI_ UNIT_INFO macro
is used for this purpose).
The %BSCSI macro can be invoked only once in the BSCSI.A86 configuration file. The
%SASI _ UNIT _INFO macro (described in the next section) can be invoked multiple times
to allow specification of the units on the SASI bus. Refer to the description of the
%SASI _ UNIT _INFO macro to see how to specify unique unit information for devices on
the SASI bus.
Bootstrap Loader 3-41