Intel SE7501WV2 User Manual

Returns 

ES:DI = Pointer to data buffer 
CF 

= 0 Success 

 

= 1 Failure 

Error codes: 
AH 

= 1 Flash area not supported 

 

= 2 Flash write failed 

 

= 5 Invalid OEM index 

 

= 86h Function not supported 

 

= 88h Security failure 

The system BIOS provides real-mode calls to Read, Write, and Master Read/Write the IPMB. 
The Read and Write functions are used for all master/slave I

2

C devices on all buses.  

IPMB Services have the following characteristics: 

• 

They are 16-bit real-mode (EMM386 cannot be running). 

• 

They can be used for all IPMB commands. 

• 

They can be used to communicate with any I

2

C controller. 

• 

If the carry flag is set, the interface has broken or timed-out. 

• 

The caller is responsible for providing proper inputs. No sanity check is provided. 

• 

The caller is responsible for checking completion code. 

Call With 

AH  =  Dah 
AL = 20h 
BH = IMB Command 
BL   = 99h (Read) or 9Ah (Write) 
CH  = Bus Indicator 
CL   = Number of bytes to write 
DH  = I2C Controller Slave Address 
DL[7:2]  = Network Function number 
DL[1:0]  = LUN 
ES:DI  = Input/Output Buffer 

Returns 

ES:DI  = Pointer to output data (if READ) 
CF = 0  Success 
 

=  1  Function not supported (if AH = 86h) 

The SE7501WV2 BIOS supports one or two Intel

®

 Xeon™ processors with 512 cache.  

The SE7501WV2 BIOS complies with all requirements of the Intel Multi-Processor Specification 
(MPS), Revision 1.4, for symmetric multiprocessor support. The version number can be 
configured using BIOS Setup. The base MP configuration table contains the following entries: