typedef unsigned int uint32_t;
typedef unsigned char uint8_t;
typedef void (*rom_t)(unsigned char fboot);

int main(int argc, char *argv[])
{
    (void)argv;
    uint32_t timer_start;
    uint32_t cur_pc = (uint32_t)argc;
    rom_t rom = (rom_t)0x20000;
    uint8_t *uart_fifo = (uint8_t*)0x44001000;
    uint32_t *gtmr_reg = (uint32_t *)0x40020000;
    char flag = '3';

    /* kl1 0x00fc1000, kl2 0x0ffd9000, kl3 0x10000800*/
    if (0 == cur_pc >> 24) {
        rom = (rom_t)0x30000;
        uart_fifo = (uint8_t*)0x44001000;
        gtmr_reg = (uint32_t*)0x44003000;
        flag = '1';

        /* apb enable */
        *((uint32_t*)0x44000004) |= 0x1 << 2;
        gtmr_reg[2] = 0xffffffff;
        gtmr_reg[1] |= 0x1 << 4;
        gtmr_reg[1] |= 0x1 << 1;
    } else if (0xf == cur_pc >> 24) {
        rom = (rom_t)0x30000;
        uart_fifo = (uint8_t*)0x44001000;
        gtmr_reg = (uint32_t*)0x44003000;
        flag = '2';

        gtmr_reg[2] = 0xffffffff;
        gtmr_reg[1] |= 0x1 << 4;
        gtmr_reg[1] |= 0x1 << 1;
    } else if (0x10 == cur_pc >> 24) {
        rom = (rom_t)0x20000;
        uart_fifo = (uint8_t*)0x40010000;
        gtmr_reg = (uint32_t*)0x40020000;
        flag = '3';
    } else {
        /* 无法判断时，默认kl3 */
        rom = (rom_t)0x20000;
        uart_fifo = (uint8_t*)0x40010000;
        gtmr_reg = (uint32_t*)0x40020000;
        flag = '3';
    }

    timer_start = gtmr_reg[4];
    while(1000 * 1000 > gtmr_reg[4] - timer_start);

    /* 串口发送数据 */
    uart_fifo[0] = '\r';
    uart_fifo[0] = '\n';
    uart_fifo[0] = 'K';
    uart_fifo[0] = 'L';
    uart_fifo[0] = flag;

    /* version */
    uart_fifo[0] = '-';
    uart_fifo[0] = 'V';
    uart_fifo[0] = '1';
    uart_fifo[0] = '.';
    uart_fifo[0] = '0';

    /* 等待串口发送完成 */
    timer_start = gtmr_reg[4];
    while(1000 * 1000 > gtmr_reg[4] - timer_start);

    rom(0);
}