RTLBT_MAX_CMD_DATA_LEN
int frag_num = fw->len / RTLBT_MAX_CMD_DATA_LEN + 1;
int frag_len = RTLBT_MAX_CMD_DATA_LEN;
frag_len = fw->len % RTLBT_MAX_CMD_DATA_LEN;
data += RTLBT_MAX_CMD_DATA_LEN;
uint8_t data[RTLBT_MAX_CMD_DATA_LEN];