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Checkpoint
Beep Code
Code
90h
91h
92h
93h
95h
96h
97h
98h
1-2
99h
9Ah
Description
Initialize hard-disk controller. If the CMOS
RAM is valid and intact, and fixed disks are
defined, call the fixed disk init routine to
intialize the fixed disk system and take over
the appropriate interrupt vectors.
Configure the local bus IDE timing register
based on the drives attached to it.
Jump to UserPatch2.
Build MPTABLE for multi-processor boards.
1. Check CMOS for CD-ROM drive present
2. Activate the drive by checking for media
present
3. Check sector 11h (17) for Boot Record Vol-
ume Descriptor
4. Check the boot catalog for validity
5. Pick a boot entry
6. Create a Specification Packet
Reset segment-register addressibility from
4GB to normal 64K by generating a Shut-
down 8.
Create pointer to MP table in Extended
BDA.
Search for option ROMs. ROM scan the area
from C800h for a length of
BCP_ROM_Scan_Size (or to E000h by
default) on every 2K boundry, looking for
add on cards that need initialization.
Check support status for Self-Monitoring
Analysis Reporting Technology (disk-failure
warning).
Shadow miscellaneous ROMs if specified by
Setup and CMOS is valid and the previous
boot was OK.
31
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