i2c_reg_max_read
reg.ereg_max_read = MIN(i2c_reg_max_read(at->at_regs[0]), AT24C_MAX_IO);
reg.ereg_max_read = MIN(i2c_reg_max_read(ee->ee_mem_hdl),
reg.ereg_max_read = MIN(i2c_reg_max_read(spd->spd_regs),
extern uint32_t i2c_reg_max_read(i2c_reg_hdl_t *);