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AX = B401h
Return:
CF clear if successful AX = 0000h BX = maximum size of configuration table in bytes CX = required configuration buffer size (includes scratch space used by ACFG code) EDI = linear/physical address of ESCD table (see #01244) CF set on error AX = error code (see #01243)
See Also: AX=B400h - AX=B402h - @xxxxh:xxxxh"Plug-and-Play"
Format of Intel Plug-and-Play Extended System Configuration Data table: Offset Size Description (Table 01244) 00h WORD total length of this table 02h 4 BYTEs signature "ACFG" 06h BYTE minor version number 07h BYTE major version number (currently 02h) 08h BYTE number of boards listed in the configuration data 09h 3 BYTEs reserved (00h) 0Ch var board data. WORD checksum
Notes: This table contains information about the standard devices in the system, such as serial ports, parallel ports, etc. For each device, it includes at least the I/O port address (03F8h,02F8h,0378h,etc).. The sum of all words in the table, including the checksum field (with implied zero padding if the length is odd), must equal 0000h
See Also: #01245
Format of Extended System Configuration Data Board Header: Offset Size Description (Table 01245) 00h WORD length of this header in bytes 02h BYTE slot number 00h motherboard 01h-0Fh ISA/EISA 10h-40h PCI 03h BYTE reserved (00h)
See Also: #01244 - #01246
Format of Extended System Configuration Data Freeform Board Header: Offset Size Description (Table 01246) 00h 4 BYTEs signature "ACFG" 04h BYTE minor version number 05h BYTE major version number (currently 02h) 06h BYTE board type 01h ISA 02h EISA 04h PCI 08h PCMCIA 10h PnPISA 20h MCA 07h BYTE reserved (00h) 08h WORD disabled functions (bit N set = function N disabled) 0Ah WORD configuration error functions 0Ch WORD reconfigurable functions (bit N set = function N reconfig'able) 0Eh 2 BYTEs reserved (00h)
See Also: #01249 - #01250
Format of Extended System Configuration Data Freeform PCI Device Data: Offset Size Description (Table 01247) 00h BYTE PCI bus number 01h BYTE PCI device and function number 02h WORD PCI device identifier 04h WORD PCI vendor ID (see #00732 at INT 1A/AX=B102h) 06h 2 BYTEs reserved (00h)
See Also: #01247 - #01250
Format of Extended System Configuration Data Freeform PnP ISA Board ID: Offset Size Description (Table 01248) 00h DWORD vendor ID (EISA device identifier) 04h DWORD serial number
See Also: #01248 - #01249
Format of Extended System Configuration Data PnP ISA ECD Extension Function: Offset Size Description (Table 01249) 00h WORD 001Eh (length of this structure) 02h BYTE 01h (selection size) 03h BYTE 00h (selection data) 04h BYTE C0h (function information byte) (see #01252) 05h BYTE 18h (size of following free-format data) 06h 16 BYTEs freeform board header (see #01246) 16h 8 BYTEs Plug-and-Play board ID (see #01248)
Note: ECD = Extended Configuration Data; this structure must be the last "function" for a particular ISA Plug-and-Play board
See Also: #01250
Format of Extended System Configuration Data PCI ECD Extension Function: Offset Size Description (Table 01250) 00h WORD length of this structure (at least 001Eh, up to 0056h) 02h BYTE 01h (selection size) 03h BYTE 00h (selection data) 04h BYTE C0h (function information byte) (see #01252) 05h BYTE size of following free-format data (at least 18h, max 50h) 06h 16 BYTEs freeform board header (see #01246) 16h 8N BYTEs PCI board ID (see #01247) for one to eight boards
Notes: ECD = Extended Configuration Data; this structure must be the last "function" for a particular PCI board. AMI BIOS v1.00.05.AX1 sets the length field to 001Ch for entries with a single board ID, apparently treating the field as the length of the remainder of the structure instead of the full structure's length
See Also: #01249
Bitfields for EISA ID and Slot Information: Bit(s) Description (Table 01251) 3-0 selector among duplicate configuration file names (0000 if no dups) 5-4 slot type. 00 expansion slot. 01 embedded. 10 virtual slot. 11 reserved 6 ID is readable 7 duplicate IDs present 8 board can be disabled 9 IOCHKERR supported 10 board or entries locked 13-11 reserved 14 board does not have or need configuration file 15 configuration not complete
See Also: #01252
Bitfields for EISA Function Information: Bit(s) Description (Table 01252) 0 subtype data 1 memory information (see #01253) 2 IRQ information (see #01255) 3 DMA information (see #01256) 4 port range information (see #01257) 5 port initialization data (see #01258) 6 free form data 7 function disabled
See Also: #01249 - #01250 - #01251
Format of EISA Memory Information: Offset Size Description (Table 01253) 00h WORD memory information flags (see #01254) 02h 3 BYTEs high 24 bits of memory start address (LSB first) 05h WORD memory size in K (0000h = 65536K)
See Also: #01252
Bitfields for EISA Memory Information Flags: Bit(s) Description (Table 01254) 0 writable (RAM rather than ROM) 1 cached 2 write-back cache rather than write-through 4-3 memory type. 00 system. 01 expantion. 10 virtual. 11 other 5 shared 6 reserved (0) 7 more entries follow 9-8 memory width. 00 byte. 01 word. 10 dword. 11 reserved 11-10 decoded address lines. 00 = 20. 01 = 24. 10 = 32. 11 reserved 15-12 reserved (0)
See Also: #01253
Bitfields for EISA IRQ Information: Bit(s) Description (Table 01255) 3-0 IRQ number 4 reserved (0) 5 IRQ triggering (0 = edge, 1 = level) 6 IRQ is shareable 7 more entries follow 15-8 reserved (0)
See Also: #01252
Bitfields for EISA DMA Information: Bit(s) Description (Table 01256) 2-0 DMA channel number 5-3 reserved (0) 6 shareable 7 more entries follow 9-8 reserved 11-10 DMA transfer size. 00 byte. 01 word. 10 dword. 11 word, but count in bytes 13-12 DMA timing. 00 ISA-compatible. 01 EISA type "A". 10 EISA type "B". 11 EISA type "C"/"F" (burst) 15-14 reserved (0)
See Also: #01252
Format of EISA Port Range Information: Offset Size Description (Table 01257) 00h BYTE port description
bits 4-0:
Number of sequential ports bit 5 reserved (0)bit 6:
Shareablebit 7:
More entries follow 01h WORD I/O port address
See Also: #01252 - #01258
Format of EISA Port Initialization Data: Offset Size Description (Table 01258) 00h BYTE flags
bits 1-0:
Port size 00 byte 01 word 10 dword 11 reservedbit 2:
Masked write bits 6-3 reserved (0)bit 7:
More entries follow 01h ???
See Also: #01252 - #01257
Category: Expansion Bus Bios - Int 1Ah - I
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