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specifically tailored for the disk drive controller it is sent to. Refer
to documentation on the particular controller module for the
format of its packets, and for using the
Default 162Bug Controller and Device Parameters
162Bug initializes the parameter tables for a default configuration
of controllers and devices (refer to Appendix B). If the system needs
to be configured differently than this default configuration (for
example, to use a 70MB Winchester drive where the default is a
40MB Winchester drive), then these tables must be changed.
There are two ways to change the parameter tables:
Disk I/O Error Codes
162Bug returns an error code if an attempted disk operation is
unsuccessful.
Network I/O Support
The Network Boot Firmware provides the capability to boot the
CPU through the Flash/PROM debugger using a network (local
Ethernet interface) as the boot device.
Using
or
. When you invoke one of these commands,
BO
BH
the configuration area of the disk is read and the parameters
corresponding to that device are rewritten according to the
parameter information contained in the configuration area.
This is a temporary change. If a cold-start reset occurs, then
the default parameter information is written back into the
tables.
Using the
. You can use this command to reconfigure the
IOT
parameter table manually for any controller and/or device
that is different from the default. This is also a temporary
change and is overwritten if a cold-start reset occurs.
Network I/O Support
command.
IOC
3
3-19
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