using the bootstrap loader

CONFIGURING THE FIRST STAGE
Table 3-2. 5.25-Inch Diskettes Supported by iSBC@208 and MSC-Specific Drivers
Sector Size Density Sectors per Track
256 Single 9
256 Double 16
NOTE: The diskettes can be formatted with either 48 tracks per inch or 96 tracks per inch, and
can be either single- or double-sided.
Table 3-3. 8-Inch Diskettes Supported by iSBC@ 208 and MSC-Specific Drivers
Sector Size Density Sectors per Track
128 Single 26
256 Double 26
NOTE: The diskettes may be either single- or double-sided.
The Intel-supplied BS1.A86 and BSIMB2.A86 configuration files include %DEVICE
macros for all the supported devices, and include mUltiple instances of some of the macros
to indicate multiple units on the same device. It doesn't hurt to include support for all of
these devices, even if your application system won't contain all of them. If you add a new
device later, you'll be able to boot from the device without generating new boot PROM
devices. However, you can reduce the size of your Bootstrap Loader by excluding support
for devices that you never intend to use. Release 3.2 of the iSDM monitor provides space
from OFE400H to OFFF7FH for use by the Bootstrap Loader. This requires you choose
only the devices you need when you reconfigure the Bootstrap Loader so it will fit into the
space allocated by the iSDM monitor. If the Bootstrap Loader does not fit into the space
allocated by the monitor, you must locate it below the monitor.
To exclude a device driver from the Bootstrap Loader,
1. Exclude all the %DEVICE macros in BS1.A86 or BSIMB2.A86 that apply to
device units on that controller. To do this, edit BS1.A86 or BSIMB2.A86 and
replace the percent sign (%) in front of the macro with a semicolon (;). The
edited version of such a macro would look similar to:
;device(baO, 0, deviceinit264, deviceread264)
The semicolon replacing the percent sign turns the %DEVICE macro for the
iSBC 264 driver (in this case) into a comment.
2. Edit the file BS 1.CSD as described later in this chapter.
Bootstrap Loader 3-27