Rabbit 2000 - 6 The System ID Block; Definition

Designer’s Handbook 23
6. The System ID Block
The BIOS supports a system identification block to be placed at the top of flash memory.
Identification information for each device can be placed in it for access by the BIOS, flash
driver, and users. This block will contain specific part numbers for the flash and RAM de-
vices installed, the product’s serial number, Media Access Control (MAC) address if an
Ethernet device, and so on. In addition, the ID block is designed with future expansion in
mind by including a table version number and storing the block’s size in bytes within the
block itself.
6.1 Definition
The following global struct is defined in IDBLOCK.LIB and loaded from the flash device
during BIOS startup. Users can access this struct in RAM if they need information from
it. The particular definition below is for a 128-byte ID block; the actual size can vary ac-
cording to the value in idBlockSize. The reserved[] field will expand and/or shrink
to compensate for the change in size.
typedef struct {
int tableVersion; // ver. num for this table layout
int productID; // Z-World part #
int vendorID; //1=Z-World
char timestamp[7]; // YY/M/D H:M:S
long flashID; // Z-World part #
int flashType; // Write method
int flashSize; // in 1000h pages
int sectorSize; // size of flash sector in bytes
int numSectors; // number of sectors
int flashSpeed; // in nanoseconds
long flash2ID; // Z-World part #, 2nd flash
int flash2Type; // Write method, 2nd flash
int flash2Size; // in 1000h pages, 2nd flash
int sector2Size; // byte size of 2nd flash's sectors
int num2Sectors; // number of sectors
int flash2Speed; // in nanoseconds, 2nd flash
long ramID; // Z-World part #
int ramSize; // in 1000h pages
int ramSpeed; // in nanoseconds
int cpuID; // CPU type identification
long crystalFreq; // in MHz
char serialNumber[24]; // device serial number
char productName[30]; // null-terminated string
char reserved[1]; // reserved 4 later use - size can
// grow
long idBlockSize; // size of the SysIDBlock struct
int userBlockSize; // size of user block (directly
// below ID block)
int userBlockLoc; // offset of start of user block
// from this block