Post Codes - DIGITAL-LOGIC MICROSPACE MSM800SEV Technical User's Manual

DIGITAL-LOGIC AG
13.2

POST CODES

BIOS POST CODES
Checkpoint Function Name
FOh Reset Vector
80h UserPrelnit
00h PreSiolnit
01h Clocklnit
02h GxmReglnit
03h UnReal
04h gxmMemReg1nit
05h gxmTest
06h MemSetup
memTest-
PinCheck
07h memSetUpStack
08h memTest
09h shadowRom
Intermediate Function Description
Codes
FOh XpressROM code execution start
--- User added code to be run first
60h First SIO access, Core SIO initialize, LPT can be
mapped to 1/0 80h for
embedded devices to provide POST code output.
--- Chipset level clock initialize
--- 1/0 based Geode initialize
--- Create a 32-bit real mode descriptor
--- Memory mapped 1/0 based Geode initialize
--- Geode CPU tests
20h Test entry
28h- 2Fh Test stepping ID (2Fh = Test Failed)
2Ah Test feature
2Eh Test passed exit
--- Auto size memory controller DIMM I and DIMMO
70h Set the clock drive strength and shift value, mask the
clocks
72h Set the data, address, and control drive, clear refer-
ence timer and VGA
wrap
73h Set the register to indicate no DIMMs installed
74h Default CAS latency to 3
75h or 7Fh Memory sizing (7Fh = No memory located)
76h Do refresh
7E MemSetup exit
--- See if MTEST pins to be enabled
--- Setup a stack
90h or 9Fh Create stack (9Fh = Stack creation failure)
9Eh Stack setup exit
--- Test memory address lines
BOh Test memory
BEh Memory test exit
BFh Memory test failed (i.e., BOh)
--- Copy ROM from FOOO:0000 to RAM at FOOO:0000
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MSM800 SEV Manual V1.0A