Wincor Nixdorf BEETLE F2-ULV-CPU, User Manual

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F2 ULV-CPU
50
POST Code
(Hex)
Name Description
22h 8742_TEST Read 8742 self-test results.
IF <self-test failed> THEN
Halt.
ELSE
Read system info from 8742
Set 8742 command byte.
ENDIF
24h SET_HUGE_ES Go into protected mode.
Set ES, DS, SS, FS, and GS to 4Gb.
28h SIZE_RAM Determine the size of each DRAM bank. Set DRAM con-
troller configuration registers to enable DRAM.
29h MEM_MGR_INIT Initialize the POST Memory manager.
2Ah ZERO_BASE_RAM Clear the 512k of DRAM.
2Ch ADDR_TEST Test for stuck address line in lower 1M of address space,
IF <test failed> THEN
Halt.
ENDIF
2Eh BASERAML Test for stuck DRAM data line by walking a 1 through all
bit locations of address 0 and then walking a 0 through.
IF <test failed> THEN
Halt.
ENDIF
2Fh PRE_SYS_SHADOW Clears the cache before shadowing the system.
32h COMPUTE_SPEED Determine the CPU core speed by timing the execution
of a loop.
33h PDM_INIT Initialize the Phoenix Dispatch Manager.
34h CMOS_TEST Clear CMOS diagnostic byte.
IF <CMOS battery is dead> THEN
Set “bad battery” flag in CMOS
IF <CMOS checksum is bad> THEN
Set “bad CMOS check” flag in CMOS
Checksum CMOS
ENDIF
ENDIF
36h CHK_SHUTDOWN Vector to proper shutdown routine (reset).
38h SYS_SHADOW Copy system BIOS ROM to shadow RAM.
3Ah CACHE_AUTO Detect the amount of SRAM for the L2 cache. Set L2
cache controller configuration registers to enable SRAM.