Technical data

Troubleshooting
Boot ROM Selftests
4-6
Early Selftest
The Early Selftest performs initialization and Selftest functions which do not require
memory. It operates on the:
CPU
Cache memory
Memory interface
I/O interface
Read/Write Memory Test
The read/write memory test configures and tests the memory sub-system using both writes
and reads.
Read-Only Memory Test
The read-only memory test configures and tests the memory sub-system using reads only.
Late Selftest
The late Selftest runs tests on functions which require memory or aren’t needed to config-
ure memory. It also “cleans up” after the Selftest, setting registers to values suitable for
normal operation. The Late Selftest performs the following tests:
Cache
I/O bus interface
Extended Selftest
The purpose of the extended Selftest is to test those areas of the board computer which are
not routinely tested by the power-up Selftest. This includes VMEbus, HP-IB, the real-time
clock and timers.
The Boot Console User Interface is used to configure operation of the extended Selftest.