WEB failsafe mode implements on WRTNode(MT7620N)

一、发现页面文件大于1446以后，就不能显示完全，几经周折，在uipopt.h中发现了这样几处定义：

/**

 * The TCP maximum segment size.

 *

 * This is should not be to set to more than UIP_BUFSIZE - UIP_LLH_LEN - 40.

 */

#define UIP_TCP_MSS     (UIP_BUFSIZE - UIP_LLH_LEN - 40)

/**

 * The size of the uIP packet buffer.

 *

 * The uIP packet buffer should not be smaller than 60 bytes, and does

 * not need to be larger than 1500 bytes. Lower size results in lower

 * TCP throughput, larger size results in higher TCP throughput.

 *

 * \hideinitializer

 */

#define UIP_BUFSIZE     1500

/**

 * The link level header length.

 *

 * This is the offset into the uip_buf where the IP header can be

 * found. For Ethernet, this should be set to 14. For SLIP, this

 * should be set to 0.

 *

 * \hideinitializer

 */

#define UIP_LLH_LEN     14

这样算下来，不就正是UIP_TCP_MSS的值么：）也就是ip segment的大小。实践发现，改大UIP_BUFSIZE后，没有效果：（

所以，只好修改html、css、png文件的大小，保证他们都小于1446才行。按理说，大于分片大小之后，应该会出现分片重组，重组的代码似乎还有问题…

终于,在net/uip-0.9/httpd.h中发现了问题所在:

struct httpd_state {
  unsigned char state;
  unsigned short count;
  unsigned char* dataptr;
  unsigned int upload;
  unsigned int upload_total;
};

由于批量替换修改的原因,将dataptr的指针类型修改成了unsigned*型,显然是有问题的,果断改成unsigned char*

二、利用perl脚本生成fsdata：

原始的脚本有些问题，自己进行了一些修改，如下：

#!/usr/bin/perl

open(OUTPUT, "> fsdata.c");

chdir("html");

open(FILES, "find . -type f |");

while($file = <FILES>) {

    # Do not include files in CVS directories nor backup files.

    if($file =~ /(CVS|~)/) {

        next;

    }

    chop($file);

    print "Adding file $file\n";

    open(HEADER, "> /tmp/header") || die $!;

    if($file =~ /404.html/) {

      print(HEADER "HTTP/1.0 404 File not found\r\n");

    } else {

      print(HEADER "HTTP/1.0 200 OK\r\n");

    }

    print(HEADER "Server: uIP/0.9\r\n");

    if($file =~ /\.html$/) {

    print(HEADER "Content-type: text/html; charset=UTF-8\r\n");

    } elsif($file =~ /\.css$/) {

    print(HEADER "Content-type: text/css; charset=UTF-8\r\n");

    } elsif($file =~ /\.gif$/) {

    print(HEADER "Content-type: image/gif\r\n");

    } elsif($file =~ /\.png$/) {

    print(HEADER "Content-type: image/png\r\n");

    } elsif($file =~ /\.jpg$/) {

    print(HEADER "Content-type: image/jpeg\r\n");

    } else {

    print(HEADER "Content-type: text/plain; charset=UTF-8\r\n");

    }

    print(HEADER "\r\n");

    close(HEADER);

    unless($file =~ /\.plain$/ || $file =~ /cgi/) {

    system("cat /tmp/header $file > /tmp/file");

    } else {

    system("cp $file /tmp/file");

    }

    # now the FILE contains header & body data

    open(FILE, "/tmp/file");

    #system("cat /tmp/file");

    # delete the tmp files    

    unlink("/tmp/file");

    unlink("/tmp/header");

    # manfeel , delete leading dot (eg: ./img/logo.gif) 

    $file =~ s/\.//;

    $fvar = $file;

    $fvar =~ s-/-_-g;

    # manfeel

    # print "fvar = $fvar\n";

    $fvar =~ s-\.-_-g;

    # print "fvar = $fvar\n";

    print(OUTPUT "static const char data".$fvar."[] = {\n");

    print(OUTPUT "\t/* $file */\n");

    # manfeel , we don't need the filename in this format

    #for($j = 0; $j < length($file); $j++) {

    #printf(OUTPUT "%#02x, ", unpack("C", substr($file, $j, 1)));

    #}

    #printf(OUTPUT "0,\n");

    $i = 0;        

    $flen = 0;

    while(read(FILE, $data, 1)) {

        if($i == 0) {

            print(OUTPUT "\t");

        }

        printf(OUTPUT "0x%02X, ", unpack("C", $data));

        $i++;

        $flen++;

        if($i == 128) {

            print(OUTPUT "\n");

            $i = 0;

        }

    }

    print(OUTPUT "0x00 };\n\n");

    close(FILE);

    push(@fvars, $fvar);

    push(@files, $file);

    push(@flens, $flen);

    #printf("file len = $flen\n");

}

for($i = 0; $i < @fvars; $i++) {

    $file = $files[$i];

    $fvar = $fvars[$i];

    $flen = $flens[$i];

    if($i == 0) {

        $prevfile = "NULL";

    } else {

        $prevfile = "file" . $fvars[$i - 1];

    }

    print(OUTPUT "const struct fsdata_file file".$fvar."[] = {{\n\t$prevfile, \n\t\"$file\", ");

    print(OUTPUT "\n\tdata$fvar , ");

    print(OUTPUT "\n\t(int) sizeof(data$fvar) - 1 /*$flen*/ \n}};\n\n");

    # print(OUTPUT "\n\t$flen \n}};\n\n");

}

print(OUTPUT "#define FS_ROOT file$fvars[$i - 1]\n\n");

print(OUTPUT "#define FS_NUMFILES $i");

 

三、修改唯一指示灯，刷入固件时能够闪烁显示其工作状态。

查看WRTNode的电路图，发现唯一的LED连在SPI_HOLD上，对应的是GPIO38

LED初始化代码如下：

#define LED_GPIO38 (0x4000)

// manfeel , 2014-06-08 for WRTNode

void led_init()

{

    printf("WRTNode LED init.\n");

    // WRTNode has only one LED connected in GPIO38

    ra_or(PRGIO_ADDR+0x4c, LED_GPIO38); // set LED as output

    LEDON();

}

void led_control(int led_bit, int state)

{

    if(1 == state)    // off

    {

            ra_or(PRGIO_ADDR+0x48, LED_GPIO38);//set 1 

    }

    else    // on

    {

             ra_and(PRGIO_ADDR+0x48, ~(LED_GPIO38));//set 0

    }

}

void LEDON(void)

{

    led_control(READY_LED_BIT, 0);

}

void LEDOFF(void)

{

    led_control(READY_LED_BIT, 1);    

}

四、加入boot、httpd命令，并优先从USB启动，如果启动USB失败，则再从SPI启动，如果还是失败，则最终进入UBoot刷机模式。

if(BootType == '3') { 

    char *argv[2]; 

    sprintf(addr_str, "0x%X", CFG_KERN_ADDR); 

    argv[1] = &addr_str[0]; 

    printf("   \n3: System Boot system code via Flash.\n"); 

    LEDON(); 

    // manfeel , first we try to boot from USB 

    do_bootd(cmdtp, 0, 1, NULL); 

    // if fail, then boot from spi flash 

    do_bootm(cmdtp, 0, 2, argv); 

    // manfeel , if boot failed,then do_bootm will return here 

    // so we can start web failsafe mode here! 

    //eth_initialize(gd->bd); 

    // manfeel , by anyway now, recved flag should be 1 

    set_recv_flag(1); 

    NetLoopHttpd(); 

    return 0;

}