11 Appendix A: JIDA Standard

11 Appendix A: JIDA Standard

Every board with an on-board BIOS extension supports the following function calls, which supply information about the board. Jumptec Intelligent Device Architecture (JIDA) functions are called via Interrupt 15h. Functions include:

AH=Eah AL=function number DX=4648h (security word) CL=board number (starting with 1)

The interrupt returns a CL￿0 if a board with the number specified in CL does not exist. CL will equal 0 if the board number exists. In this case, the content of DX determines if the operation was successful. DX=6B6Fh indicates success; other values indicate an error.

11.1JIDA Information

To obtain information about boards that follow the JIDA standard, use the following procedure.

Call Get BIOS ID with CL=1.

The name of the first device installed will be returned.

If you see the result Board exists (CL=0), increment CL, and call Get BIOS ID again. Repeat until you see Board not present (CL￿0).

You now know the names of all boards within your system that follow the JIDA standard.

You can find out more information about a specific board by calling the appropriate inquiry function with the board’s number in CL.

Note:

Association between board and board number may change because of configuration changes. Do not rely on

 

any association between board and board number. Always use the procedure described above to determine

 

the association between board and board number.

 

 

Refer to the JIDA manual in the jidai1xx.zip folder, which is available from the Kontron Embedded Modules GmbH Web site, for further information on implementing and using JIDA calls with C sample code.

Kontron User's Guide ETX CD

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Intel ETX CD manual Appendix a Jida Standard, Jida Information