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Troubleshooting 89
12h Restore processor control word during warm boot
13h Initialize PCI bus mastering devices
14h Initialize keyboard controller
16h 1-2-2-3 BIOS ROM checksum
17h Initialize cache before memory auto-size
18h 8254 timer initialization
1Ah 8237 DMA controller initialization
1Ch Reset programmable interrupt controller
20h 1-3-1-1 Test DRAM refresh
22h 1-3-1-3 Test 8742 keyboard controller
24h Set ES segment register to 4 GB
28h Auto-size DRAM
29h Initialize POST Memory Manager
2Ah Clear 512 kb base RAM
2Ch 1-3-4-1 RAM failure on address line xxxx*
2Eh 1-3-4-3 RAM failure on data bits xxxx* of low byte of memory bus
2Fh Enable cache before system BIOS shadow
32h Test processor bus-clock frequency
33h Initialize Phoenix Dispatch Manager
36h Warm start shut down
38h Shadow system BIOS ROM
3Ah Auto-size cache
3Ch Advanced configuration of chipset registers
3Dh Load alternate registers with CMOS values
42h Initialize interrupt vectors
45h POST device initialization
46h 2-1-2-3 Check ROM copyright notice
48h Check video configuration against CMOS
49h Initialize PCI bus and devices
4Ah Initialize all video adapters in system
4Bh QuietBoot start (optional)
4Ch Shadow video BIOS ROM
Test
Point
Beep
Code
POST Routine Description
* If the BIOS detects error 2C or 2E, it displays an additional word-bitmap (xxxx) indicating
the address line or bits that failed. For example, “2C 0002” means address line 1 (bit one
set) has failed. “2E 1020” means data bits 12 and 5 (bits 12 and 5 set) have failed in the
lower 16 bits.
8507328.book Page 89 Thursday, February 15, 2001 11:28 AM