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146 Chapter 4
Each SmmDriver entry point used in 80_PORT
* If the BIOS detects error 2C, 2E, or 30 (base 512K RAM error), it displays an additional word-bitmap (xxxx)
indicating the address line or bits that failed. For example, 2C 0002 means address line 1 (bit one set) has
failed. 2E 1020 means data bits 12 and 5 (bits 12 and 5 set) have failed in the lower 16 bits. Note that error 30
cannot occur on 386SX systems because they have a 16 rather than 32-bit bus. The BIOS also sends the
bitmap to the port-80 LED display. It first displays the check point code, followed by a delay, the high-order
byte, another delay, and then the low-order byte of the error. It repeats this sequence continuously.
Code Description
0xC0 SMM_ACCESS
0xC2 SMM_CONTROL
0xC1 SMM_BASE
0xC3 SMMAP
0xC4 SMMCORE
0xC5 SMM_DISPATCH
0xC6 SMM_START
0xC7 SMM_RUNTIME
0xC8 SB_SMM_DISPATCH
0xC9 SMM_THUNK
0xCA SMM_ACPI_SW_CHILD
0xCB SMM_SB_S3_SAVE
0xCC SMM_PLATFORM
0xCD SMM_GMCH_MBI
0xCE SMM_FW_BLOCK_SERVICE
0xCF SMM_VARIABLE
0xD0 SMM_IHISI
0xD1 SMM_INT15_MICROCODE
0xD2 SMM_PNP
0xD3 SMM_USB_LEGACY
0xD4 SMM_INT13_HDD
0xD5 SMM_INIT_PPM
0xD6 SMM_OHCI1394
0xD7 SMM_ SECURITY_HDD_PASSWORD_SERVICE
0xD8 SMM_OEM_SERVICE
0xD9 SMM_PPM
0xDA SMM_DIGITAL_THERMAL_SENSOR