u-boot-2010.03在XC2440开发板上的移植—08

9、u-boot增加串口xmodem协议

   

    u-boot中已经有了串口驱动，现在要添加load命令，即使用串口xmodem协议传输文件。

（1）在smdk2440.h中增加支持loadx命令的配置，修改代码如下：

#define CONFIG_MTD_DEVICE
#define CONFIG_MTD_PARTITIONS
#define MTDIDS_DEFAULT "nand0=nandflash0"
#define MTDPARTS_DEFAULT        "mtdparts=nandflash0:1m@0(bios)," \
                                    "128k(params)," \
                                    "4m(kernel)," \
                                    "-(root)"
#define ENABLE_CMD_LOADB_X    1

（2）修改common目录下的cmd_load.c文件，加入load_serial_xmodem的函数声明，修改的代码如下：

#if defined(CONFIG_CMD_LOADB)
#if defined(ENABLE_CMD_LOADB_X)
static ulong load_serial_xmodem (ulong offset);
#endif
static ulong load_serial_ymodem (ulong offset);
#endif

（3）在do_load_serial_bin 函数中修改代码如下：

if (load_baudrate != current_baudrate) {
        printf ("## Switch baudrate to %d bps and press ENTER ...\n",
            load_baudrate);
        udelay(50000);
        gd->baudrate = load_baudrate;
        serial_setbrg ();
        udelay(50000);
        for (;;) {
            if (getc() == '\r')
                break;
        }
    }

#if defined(ENABLE_CMD_LOADB_X)
    if (strcmp(argv[0],"loadx")==0) {
        printf ("## Ready for binary (xmodem) download "
            "to 0x%08lX at %d bps...\n",
            offset,
            load_baudrate);

        addr = load_serial_xmodem (offset);

    } else if (strcmp(argv[0],"loady")==0) {
#else
    if (strcmp(argv[0],"loady")==0) {
#endif

    //if (strcmp(argv[0],"loady")==0) {    /* zjw del 20121012 */
        printf ("## Ready for binary (ymodem) download "
            "to 0x%08lX at %d bps...\n",
            offset,
            load_baudrate);

        addr = load_serial_ymodem (offset);

    } else {

        printf ("## Ready for binary (kermit) download "
            "to 0x%08lX at %d bps...\n",
            offset,
            load_baudrate);
        addr = load_serial_bin (offset);

        if (addr == ~0) {
            load_addr = 0;
            printf ("## Binary (kermit) download aborted\n");
            rcode = 1;
        } else {
            printf ("## Start Addr = 0x%08lX\n", addr);
            load_addr = addr;
        }
    }

（4）在函数load_serial_ymodem之前增加load_serial_xmodem函数的实现，代码如下：

#if defined(ENABLE_CMD_LOADB_X)
static ulong load_serial_xmodem (ulong offset)
{
    int size;
    char buf[32];
    int err;
    int res;
    connection_info_t info;
    char xmodemBuf[1024];
    ulong store_addr = ~0;
    ulong addr = 0;

    size = 0;
    info.mode = xyzModem_xmodem;
    res = xyzModem_stream_open (&info, &err);
    if (!res) {

        while ((res =
            xyzModem_stream_read (xmodemBuf, 1024, &err)) > 0) {
            store_addr = addr + offset;
            size += res;
            addr += res;
#ifndef CFG_NO_FLASH
            if (addr2info (store_addr)) {
                int rc;

                rc = flash_write ((char *) xmodemBuf,
                store_addr, res);
                if (rc != 0) {
                flash_perror (rc);
                return (~0);
                }
            } else
#endif
            {
                memcpy ((char *) (store_addr), xmodemBuf,
                    res);
            }

        }
    } else {
        printf ("%s\n", xyzModem_error (err));
    }

    xyzModem_stream_close (&err);
    xyzModem_stream_terminate (false, &getcxmodem);


    flush_cache (offset, size);

    printf ("## Total Size = 0x%08x = %d Bytes\n", size, size);
    sprintf (buf, "%X", size);
    setenv ("filesize", buf);

    return offset;
}
#endif

（5）在最后面的U_BOOT_CMD处加入loadx命令，修改的代码如下：

#if defined(CONFIG_CMD_LOADB)
U_BOOT_CMD(
    loadb, 3, 0,    do_load_serial_bin,
    "load binary file over serial line (kermit mode)",
    "[ off ] [ baud ]\n"
    " - load binary file over serial line"
    " with offset 'off' and baudrate 'baud'"
);

#if defined(ENABLE_CMD_LOADB_X)
U_BOOT_CMD(
    loadx, 3, 0, do_load_serial_bin,
    "load binary file over serial line (xmodem mode)",
    "[ off ] [ baud ]\n"
    " - load binary file over serial line"
    " with offset 'off' and baudrate 'baud'"
);
#endif

U_BOOT_CMD(
    loady, 3, 0,    do_load_serial_bin,
    "load binary file over serial line (ymodem mode)",
    "[ off ] [ baud ]\n"
    " - load binary file over serial line"
    " with offset 'off' and baudrate 'baud'"
);

#endif

   重新编译u-boot，下载到NandFlash中运行，可以看到已经支持了loadx命令，可以使用loadx命令通过串口来下载东西了，效果如下：