Instruction manual

Table 46 (Cont.) 300 Model SROM Power-On Sequence
LED Activity Meaning
F1 Completed load of IOROM
into memory. Reading state
of jumper to see if SROM code
should trap to the miniconsole
instead of transferring execution
to console code.
Not coded to stop here.
F0 SROM code execution completed
normally. Execution transferred
to console or miniconsole.
Cannot execute console code, or the mini-
console jumper is set. (The mini-console is for
Digital use only.)
20 Machine check Trap to miniconsole.
Table 47 400/500/600/700/800/900 Model SROM Power-On Sequence
LED Activity Meaning
FF Completed setting all MCRs to
128M. Executing memory sizing
algorithm.
MCR did not read back as expected. Fatal
error.
FE Failure mapping an MCR.
(Displayed only on error.)
MCR did not read back as expected. Fatal
error.
FD Memory sizing completed.
Configuring memory.
Memory size = 0, no memory detected, so all
MCRs were mapped out. Fatal error.
FC Failure mapping an MCR.
Error dump sent to SROM
port. (Displayed only on error.)
MCR did not read back as expected. Fatal
error.
FB Memory configuration
successfully completed.
Initializing test range of memory
to zeroes. Executing first of
the four memory tests. Bcache
references off. Dcache off.
Should never stop here.
FA Completed first of four memory
tests. Executing second of four
tests. Bcache references on.
Dcache off.
Should never stop here.
F9 Completed second of four
memory tests. Executing third
of four memory tests. Bcache
references off. Dcache on.
Should never stop here.
F8 Completed third of four memory
tests. Executing fourth of four
memory tests. Bcache references
on. Dcache on.
Should never stop here.
F7 Completed 4th of 4 memory
tests. Executing TC register test
and init.
Memory tests could not find enough memory to
load the console. Fatal error.
F6 Completed TC register test and
init. Executing COREIO register
test and init.
Should never stop here.
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14–4 Powerup Initialization and Firmware Entry