XFX nForce 750a User Manual

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XFX nForce 750a Motherboard User's Guide
Checkpoint Description
EF Read error occurred on media. Jump back to checkpoint EB.
E9 or EA Determine information about root directory of recovery media.
F0 Search for pre-dened recovery le name in root directory.
F1 Recovery le not found.
F2 Start reading FAT table and analyze FAT to nd the clusters occupied by the recovery le.
F3 Start reading the recovery le cluster by cluster.
F5 Disable L1 catche
FA Check the validity of the recovery le conguration to the current conguration of the ash part.
FB
Make ash write enabled through chipset and OEM specic method. Detect proper ash part.
Verify that the found ash part size equals the recovery le size.
F4 The recovery le size does not equal the found ash part size.
FC Erase the ash part.
FD Program the ash part.
FF
The flash has been updated successfully. Make flash write disabled. Disable ATAPI hardware.
Restore CPUID value back into register. Give control to F000 ROM at F000:FFF0h.
3.POST Code Checkpoints
The POST code checkpoints are the largest set of checkpoints during the BIOS pre-
boot process. The following table describes the type of checkpoints that may occur
during the POST portion of the BIOS:
Checkpoint Description
03
Disable NMI, Parity, video for EGA, and DMA controllers. Initialize BIOS, POST, Runtime data area.
Also initialize BIOS modules on POST entry and GPNV area. Initialized CMOS as mentioned in the
Kernel Variable "wCMOSFlags."
04
Check CMOS diagnostic byte to determine if battery power is OK and CMOS checksum is OK.
Verify CMOS checksum manually by reading storage area. If the CMOS checksum is bad, update
CMOS with power-on default values and clear passwords. Initialize status register A. Initializes
data variables that are based on CMOS setup questions. Initializes both the 8259 compatible PICs
in the system
05 Initializes the interrupt controlling hardware (generally PIC) and interrupt vector table.
06
Do R/W test to CH-2 count reg. Initialize CH-0 as system timer. Install the POSTINT1Ch handler.
Enable IRQ-0 in PIC for system timer interrupt. Traps INT1Ch vector to "POSTINT1ChHandlerBlock
."
08
Initializes the CPU. The BAT test is being done on KBC. Program the keyboard controller command
byte is being done after Auto detection of KB/MS using AMI KB-5.
C0 Early CPU Init Start -- Disable Cache - Init Local APIC
C1 Set up boot strap proccessor Information
C2 Set up boot strap proccessor for POST
C5 Enumerate and set up application proccessors.
C6 Re-enable cache for boot strap proccessor
C7 Early CPU Init Exit
0A Initializes the 8042 compatible Key Board Controller.
0B Detects the presence of PS/2 mouse.
0C Detects the presence of Keyboard in KBC port.
0E
Testing and initialization of different Input Devices. Also, update the Kernel Variables. Traps the
INT09h vector, so that the POST INT09h handler gets control for IRQ1. Uncompress all available
language, BIOS logo, and Silent logo modules.
13 Early POST initialization of chipset registers.

XFX nForce 750a Specifications

General

Brand	XFX
Model	nForce 750a
Category	Motherboard
Language	English