Trenton T4G, Техническое описание

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BIOS Messages T4G Technical Reference
TRENTON Technology Inc. A-9
P
OST
C
ODE
C
HECKPOINTS
(
CONTINUED
)
Check-
point
Description
38
39
3A
3B
3C
40
50
52
60
75
78
7A
7C
84
85
87
8C
8E
90
A0
A1
A2
A4
Initialize different devices through DIM. See DIM Code Checkpoints section of this
appendix for more information.
Initialize DMAC-1 and DMAC-2.
Initialize RTC date/time.
Test for total memory installed in the system. Also, check for DEL or ESC keys to limit
memory test. Display total memory in the system.
Mid POST initialization of chipset registers.
Detect different devices (parallel ports, serial ports and coprocessor in CPU, etc.)
successfully installed in the system and update the BDA, EBDA, etc.
Program the memory hole or any kind of implementation that needs an adjustment in
system RAM size if needed.
Updates CMOS memory size from memory found in memory test. Allocates memory
for Extended BIOS Data Area from base memory.
Initialize NUM-LOCK status and program the keyboard Typematic rate.
Initialize INT13 and prepare for IPL detection.
Initialize IPL devices controlled by BIOS and option ROMs.
Initialize remaining option ROMs.
Generate and write contents of ESCD in NVRAM.
Log errors encountered during POST.
Display errors to the user and get the user response for error.
Execute BIOS setup if needed/requested.
Late POST initialization of chipset registers.
Program the peripheral parameters. Enable/disable NMI as selected.
Late POST initialization of system management interrupt.
Check boot password if installed.
Clean-up work needed before booting to OS.
Take care of runtime image preparation for different BIOS modules. Fill the free area
in F000h segment with 0FFh.
Initialize the Microsoft IRQ Routing Table. Prepare the runtime language module.
Disable the system configuration display if needed.
Initialize runtime language module.