Compaq AlphaServer ES45 Service Manual page 83

SROM Power-Up Sequence
The primary CPU initiates all memory tests. The memory is tested for
address and data errors for the first 32 MB of memory in each array. It
also initializes all the "sized" memory in the system.
If a memory failure occurs, an error is reported. An untested memory
array is assigned to address 0 and the failed memory array is de-assigned.
The memory tests are rerun on the first 32 MB of memory in the
remaining arrays. If all memory fails, the "No Memory Available" message
is reported and the system halts.
If all memory passes, the primary CPU loads the console and transfers
control to it.
Power-Up Diagnostics and Display 3-9