/**
* get_cpu_board_revision - get the CPU board revision on 85xx boards
*
* Read the EEPROM to determine the board revision.
*
* This function is called before relocation, so we need to read a private
* copy of the EEPROM into a local variable on the stack.
*
* Also, we assume that CONFIG_SYS_EEPROM_BUS_NUM == CONFIG_SYS_SPD_BUS_NUM. The global
* variable i2c_bus_num must be compile-time initialized to CONFIG_SYS_SPD_BUS_NUM,
* so that the SPD code will work. This means that all pre-relocation I2C
* operations can only occur on the CONFIG_SYS_SPD_BUS_NUM bus. So if
* CONFIG_SYS_EEPROM_BUS_NUM != CONFIG_SYS_SPD_BUS_NUM, then we can't read the EEPROM when
* this function is called. Oh well.
*/
unsigned int get_cpu_board_revision(void)
{
struct board_eeprom {
u32 id; /* 0x00 - 0x03 EEPROM Tag 'CCID' */
u8 major; /* 0x04 Board revision, major */
u8 minor; /* 0x05 Board revision, minor */
} be;
i2c_read(CONFIG_SYS_I2C_EEPROM_ADDR, 0, CONFIG_SYS_I2C_EEPROM_ADDR_LEN,
(void *)&be, sizeof(be));
if (be.id != (('C' << 24) | ('C' << 16) | ('I' << 8) | 'D'))
return MPC85XX_CPU_BOARD_REV(0, 0);
if ((be.major == 0xff) && (be.minor == 0xff))
return MPC85XX_CPU_BOARD_REV(0, 0);
return MPC85XX_CPU_BOARD_REV(be.major, be.minor);
}
unsigned int
get_cpu_board_revision(void)
{
uint major = 0;
uint minor = 0;
id_eeprom_t id_eeprom;
i2c_read(CFG_I2C_EEPROM_ADDR, 0, 2,
(uchar *) &id_eeprom, sizeof(id_eeprom));
major = id_eeprom.idee_major;
minor = id_eeprom.idee_minor;
if (major == 0xff && minor == 0xff) {
major = minor = 0;
}
return MPC85XX_CPU_BOARD_REV(major,minor);
}