Annex: Post-Codes
page 78
Beckhoff New Automation Technology
CB1050
I Annex: Post-Codes
Code
Description
01h
The Xgroup-program code is written in the random access memory from address 1000:0
onwards.
03h
Initialise Variable/Routine "Superio_Early_Init".
05h
1. Cancel display
2. Cancel CMOS error flag
07h
1. Cancel 8042 (keyboard controller) Interface Register
2. Initialising and self testing of 8042 (keyboard controller)
08h
1. Test of special keyboard controllers (Winbond 977 super I/O Chip-series).
2. Enabling of the keyboard-interface register
0Ah
1. Disabling of the PS/2 mouse interface (optional).
2. Auto-detection of the connectors for Keyboard and mouse, optional: swap of PS/2 mouse ports
and PS/2 interfaces.
0Eh
Test of the F000h-memory segment (Read/Write ability). In case of an error a signal will come out
of the loud speakers.
10h
Auto-detection of the flash-rom-type and loading of the suitable Read/Write program into the run
time memory segment F000 (it is required for ESCD-data & the DMI-pool-support).
12h
Interface-test of the CMOS RAM-
logic (walking 1’s”-algorithm). Setting of the power status of the
real-time-clock (RTC), afterwards test of register overflow.
14h
Initialising of the chip-set with default values. They can be modified through a software (MODBIN)
by the OEM-customer.
16h
Initialise Variable/Routine "Early_Init_Onboard_Generator".
18h
CPU auto-detection (manufacturer, SMI type (Cyrix or Intel), CPU-class (586 or 686).
1Bh
Initialising if the interrupt pointer table. If nothing else is pretended, the hardware interrupts will
point on “SPURIOUS_INT_HDLR and the software interrupts will point on
SPURIOUS_soft_HDLR.
1Dh
Initialise Variable/Routine EARLY_PM_INIT.
1Fh
Load the keyboard table (Notebooks)
21h
Initialising of the hardware power management (HPM) (Notebooks)
23h
1. Test the validity of the RTC-
values (Example: “5Ah” is an invalid value for an RTC-minute).
2. Load the CMOS-values into the BIOS Stack. Default-values are loaded if CMOS-checksum
errors occur.
3. Preparing of the BIOS ‘resource map’ for the PCI & plug and play configuration. If ESCD is
valid, take into consideration the ESCD’s legacy information.
4. Initialise the onboard clock generator. Clock circuit at non-used PCI- and DIMM slots.
5. First initialising of PCI-devices: assign PCI-bus numbers - alot memory- & I/O resources -
search for functional VGA-controllers and VGA-BIOS and copy the latter into memory segment
C000:0 (Video ROM Shadow).
27h
Initialise cache memory for INT 09
29h
1. Program the CPU (internal MTRR at P6 and PII) for the first memory address range (0-640K).
2. Initialising of the APIC at CPUs of the Pentium-class.
3. Program the chip-set according to the settings of the CMOS-set-up (Example: Onboard
IDE-controller).
4. Measuring of the CPU clock speed.
5. Initialise the video BIOS.
2Dh
1. Initialise the “Multi-Language”-function of the BIOS
2. Soft copy, e.g. Award-Logo, CPU-
type and CPU clock speed…
33h
Keyboard-reset (except super I/O chips of the Winbond 977 series)
3Ch
Test the 8254 (timer device)
3Eh
Test the interrupt Mask bits of IRQ-channel 1 of the interrupt controller 8259.
40h
Test the interrupt Mask bits of IRQ-channel 2 of the interrupt controller 8259
43h
Testing the function of the interrupt controller (8259).
47h
Initialise EISA slot (if existent).
