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B.2
How BIOS POST Memory Testing Works
The BIOS POST memory testing is performed as follows:
1. The first megabyte of DRAM is tested by the BIOS before the BIOS code is
shadowed (that is, copied from ROM to DRAM).
2. Once executing out of DRAM, the BIOS performs a simple memory test (a
write/read of every location with the pattern 55aa55aa).
Note – This memory test is performed only if Quick Boot is not enabled from the
Boot Settings Configuration screen. Enabling Quick Boot causes the BIOS to skip the
memory test. See
information.
3. The BIOS polls the memory controllers for both correctable and non-correctable
memory errors and logs those errors into the SP.
4. The message, BMC Responding appears at the end of POST.
B.3
Redirecting Console Output
To access the SP and redirect the console output so that the BIOS POST codes can be
read remotely.
1. Attach a multi-port dongle cable to the server module UCP connector.
2. Attach a monitor to the multi-port dongle cable's video port and a keyboard to a
USB connector.
3. Power cycle or power on the server.
4. Initialize the BIOS Setup Utility by pressing the F2 key while the system is
performing the power-on self-test (POST).
The BIOS Main Menu screen appears.
5. Select Server.
The Server screen appears.
6. Select AST2000 LAN Configuration.
The LAN Configuration screen appears.
B-2
Sun Fire X4240 Server Service Manual • September 2010
Section B.4, "Changing POST Options" on page B-3
for more
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