Silicon Graphics CHALLENGE L, User Manual, Page: 141 / 164

Known Bugs
125
Allowing the System to Boot in Spite of Nonterminal
Hardware Failures
By default, the PROM will stop and generate a warning message if it finds
that a component has failed. However, the failure of a single processor or
bank of memory may not be serious enough to prevent the system from
coming up. To prevent a nonfatal hardware problem from stopping the
system, set the
nonstop variable to 1:
setenv nonstop 1
To ensure that the system displays a notification message in the event of any
hardware failure, set the
nonstop variable to 0:
setenv nonstop 0
Restoring Defaults
The PROM environment variables can be reset to their factory defaults by
using the
resetenv command while in the PROM Command Monitor. Since
resetenv also resets the netaddr environment variable, note the machine’s IP
address before using this command.
Known Bugs
The following subsections describe all of the known IO4 PROM bugs. Since
the IO4 PROM is software-writable, these bugs will be fixed by PROM
updates in future releases of the operating system.
A Spurious CD-ROM Medium Is Displayed During Startup
A bug in the CD-ROM volume size code causes the SCSI driver to display an
erroneous “No Medium Found” message if the CD-ROM caddy is empty
when the system is booted. This message can be ignored.