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Chapter 4 65
2Dh 1 Initialize double-byte language font (Optional)
2 Put information on screen display, including Award title, CPU type, CPU speed,
full screen logo.
2Eh Reserved
2Fh Reserved
30h Reserved
31h Reserved
32h Reserved
33h Reset keyboard if Early_Reset_KB is defined e.g. Winbond 977 series Super I/O
chips. See also POST 63h.
34h Reserved
35h Test DMA Channel 0
36h Reserved
37h Test DMA Channel 1
38h Reserved
39h Test DMA page registers
3Ah Reserved
3Bh Reserved
3Ch Test 8254
3Dh Reserved
3Eh Test 8259 interrupt mask bits for channel 1
3Fh Reserved
40h Test 8259 interrupt mask bits for channel 2
41h Reserved
42h Reserved
43h Test 8259 functionality
44h Reserved
45h Reserved
46h Reserved
47h Initialize EISA slot
48h Reserved
49h 1 Calculate total memory by testing the last double word of each 64K page.
2 Program write allocation for AMD K5 CPU.
4Ah Reserved
4Bh Reserved
4Ch Reserved
4Dh Reserved
4Eh 1 Program MTRR of M1 CPU
2 Initialize L2 cache for P6 class CPU & program CPU with proper cacheable
range
3 Initialize the APIC for P6 class CPU
4 On MP platform, adjust the cacheable range to smaller one in case the
cacheable ranges between each CPU are not identical
4Fh Reserved
50h Initialize the USB Keyboard & Mouse
POST Code (Hex) POST Routine Description