Acer Aspire 4743Z, Service Manual

Page: 200 / 354

4-26 Troubleshooting
POST Codes
0
The following table details the core POST codes and functions used in SecureCore.
Table 4-4. POST Codes
POST Code Function Phase Component
0xE3 First Legacy BIOS Task table for legacy reset LBT Core
0x20 Verify that DRAM refresh is operating by polling the refresh
bit in PORTB. LBT Core
0xDA Dummy PCIE Init entry, now handled by driver LBT Core
0x29 PMM (Post Memory Manager) Init LBT Core
0xE5 WHEA Init LBT Core
0x33 PDM (Post Dispatcher Manager) Init LBT Core
0x01 IPMI Init LBT Core
0xD8 ASF Init LBT Core
0x09 Set in-POST flag in CMOS that indicates we are in POST.
If this bit is cleared by postClearBootFlagJ (AEh), the
TrustedCore on next boot determines that the current
configuration caused POST to fail and uses default values
for configuration.
LBT Core
0x2B Enhanced CMOS LBT Core
0XE0 EFI Variable Init LBT Core
0xC1 PEM (Post Error Manager) Init LBT Core
0x3B Debug Service Init (ROM Polit) LBT Core
0xDC POST Update Error LBT Core
0x3A Autosize external cache and program cache size for
enabling later in POST. LBT Core
0x0B Enable CPU cache. Set bits in CMOS related to cache. LBT Core
0x0F Enable the local bus IDE as primary or secondary LBT Core
0x10 Initialize Power Management LBT Core
0x14 Verify that the 8742 keyboard controller is responding.
Send a self-test command to the 8742 and wait for results.
Also read the switch inputs from the 8742 and write the
keyboard controller command byte. LBT Core