使用uboot-1.1.6的tftp命令时总是超时，像下面这样
lzd> tftp 0x30000000 /home/lzd/nfs/image
TFTP from server 10.107.4.145; our IP address is 10.107.4.146
Filename '/home/lzd/nfs/image'.
Load address: 0x30000000
Loading: T T T T T T T T T T
Retry count exceeded; starting again
TFTP from server 10.107.4.145; our IP address is 10.107.4.146
Filename '/home/lzd/nfs/image'.
Load address: 0x30000000
Loading: T T T T T T T T T T
Retry count exceeded; starting again
......
跟踪下数据包的接受情况
#tcpdump（tcpdump -n比较好）
08:43:52.677818 arp who-has lzd-laptop.local tell 10.107.4.146
08:43:52.677860 arp reply lzd-laptop.local is-at 00:0b:db:98:a0:5d (oui Unknown)
08:43:52.677966 IP 10.107.4.146.1358 > lzd-laptop.local.tftp: 38 RRQ "/home/lzd/nfs/image" octet timeout 5
08:43:52.678016 IP lzd-laptop.local > 10.107.4.146: ICMP lzd-laptop.local udp port tftp unreachable, length 74
08:43:57.675237 arp who-has 10.107.4.146 tell lzd-laptop.local
08:43:57.675342 arp reply 10.107.4.146 is-at 00:80:00:80:00:80 (oui Unknown)
08:43:57.677452 IP 10.107.4.146.1358 > lzd-laptop.local.tftp: 38 RRQ "/home/lzd/nfs/image" octet timeout 5
08:43:57.677502 IP lzd-laptop.local > 10.107.4.146: ICMP lzd-laptop.local udp port tftp unreachable, length 74
08:44:02.677134 IP 10.107.4.146.1358 > lzd-laptop.local.tftp: 38 RRQ "/home/lzd/nfs/image" octet timeout 5
08:44:02.677199 IP lzd-laptop.local > 10.107.4.146: ICMP lzd-laptop.local udp port tftp unreachable, length 74
08:44:07.676805 IP 10.107.4.146.1358 > lzd-laptop.local.tftp: 38 RRQ "/home/lzd/nfs/image" octet timeout 5
08:44:07.676871 IP lzd-laptop.local > 10.107.4.146: ICMP lzd-laptop.local udp port tftp unreachable, length 74
08:44:12.676474 IP 10.107.4.146.1358 > lzd-laptop.local.tftp: 38 RRQ "/home/lzd/nfs/image" octet timeout 5
08:44:12.676538 IP lzd-laptop.local > 10.107.4.146: ICMP lzd-laptop.local udp port tftp unreachable, length 74
08:44:17.676144 IP 10.107.4.146.1358 > lzd-laptop.local.tftp: 38 RRQ "/home/lzd/nfs/image" octet timeout 5
08:44:17.676210 IP lzd-laptop.local > 10.107.4.146: ICMP lzd-laptop.local udp port tftp unreachable, length 74
08:44:22.675815 IP 10.107.4.146.1358 > lzd-laptop.local.tftp: 38 RRQ "/home/lzd/nfs/image" octet timeout 5
08:44:22.675879 IP lzd-laptop.local > 10.107.4.146: ICMP lzd-laptop.local udp port tftp unreachable, length 74
08:44:27.675484 IP 10.107.4.146.1358 > lzd-laptop.local.tftp: 38 RRQ "/home/lzd/nfs/image" octet timeout 5
08:44:27.675550 IP lzd-laptop.local > 10.107.4.146: ICMP lzd-laptop.local udp port tftp unreachable, length 74
08:44:32.675154 IP 10.107.4.146.1358 > lzd-laptop.local.tftp: 38 RRQ "/home/lzd/nfs/image" octet timeout 5
08:44:32.675223 IP lzd-laptop.local > 10.107.4.146: ICMP lzd-laptop.local udp port tftp unreachable, length 74
08:44:37.674825 IP 10.107.4.146.1358 > lzd-laptop.local.tftp: 38 RRQ "/home/lzd/nfs/image" octet timeout 5
08:44:37.674890 IP lzd-laptop.local > 10.107.4.146: ICMP lzd-laptop.local udp port tftp unreachable, length 74
08:44:37.675176 arp who-has 10.107.4.146 tell lzd-laptop.local
08:44:37.675268 arp reply 10.107.4.146 is-at 00:80:00:80:00:80 (oui Unknown)
08:44:42.674493 IP 10.107.4.146.1358 > lzd-laptop.local.tftp: 38 RRQ "/home/lzd/nfs/image" octet timeout 5
08:44:42.674557 IP lzd-laptop.local > 10.107.4.146: ICMP lzd-laptop.local udp port tftp unreachable, length 74
可见，主机总是在告诉dm9000a，tftp端口不可达，就是说没有tftp端口可用。
lzd-laptop.local > 10.107.4.146: ICMP lzd-laptop.local udp port tftp unreachable, length 74
奇怪我不是安装vsftpd了吗？
lzd@lzd-laptop:~$ netstat -a |grep tcp (netstat -an |grep tcp)
tcp 0 0 *:nfs *:* LISTEN
tcp 0 0 *:53516 *:* LISTEN
tcp 0 0 *:sunrpc *:* LISTEN
tcp 0 0 *:45203 *:* LISTEN
tcp 0 0 *:ftp *:* LISTEN
tcp 0 0 localhost:ipp *:* LISTEN
tcp 0 0 *:51743 *:* LISTEN
lzd@lzd-laptop:~$ netstat -a |grep udp
udp 0 0 *:52993 *:*
udp 0 0 *:nfs *:*
udp 0 0 *:55968 *:*
udp 0 0 *:35879 *:*
udp 0 0 *:42054 *:*
udp 0 0 *:736 *:*
udp 0 0 *:mdns *:*
udp 0 0 *:sunrpc *:*
真的没有tftp的服务器，原来vsftpd不是tftp服务器，呵呵，真菜。google下，看看大家都用什么tftp服务器。
找到了，我只安装服务器。
sudo apt-get install tftpd ［tftp］
我没安装 netkit-inetd
sudo apt-get install netkit-inetd
但是，netkit-inetd是必须的，tftpd依赖它来管理网络连接，所以
The following extra packages will be installed:
openbsd-inetd
The following NEW packages will be installed:
openbsd-inetd tftpd
发现了/etc/inetd.conf 配置文件，内容是默认的，已经写好了，呵呵
tftp dgram udp wait nobody /usr/sbin/tcpd /usr/sbin/in.tftpd /srv/tftp
但是/srv/tftp这个目录并没有被创建
#/srv/tftp
#mkdir tftp
重新启动inetd
#/etc/init.d/openbsd-inetd restart
在检查下
root@lzd-laptop:~# netstat -an|grep udp
udp 0 0 0.0.0.0:52993 0.0.0.0:*
udp 0 0 0.0.0.0:2049 0.0.0.0:*
udp 0 0 0.0.0.0:55968 0.0.0.0:*
udp 0 0 0.0.0.0:35879 0.0.0.0:*
udp 0 0 0.0.0.0:69 0.0.0.0:* ok了
udp 0 0 0.0.0.0:42054 0.0.0.0:*
udp 0 0 0.0.0.0:736 0.0.0.0:*
udp 0 0 0.0.0.0:5353 0.0.0.0:*
udp 0 0 0.0.0.0:111 0.0.0.0:*
inetd已经开始运行了，^_^ 在试试看。
lzd> tftp 0x30000000 /home/lzd/nfs/image
dm9000 i/o: 0x20000300, id: 0x90000a46
MAC: 00:80:00:80:00:80
TFTP from server 10.107.4.145; our IP address is 10.107.4.146
Filename '/home/lzd/nfs/image'.
Load address: 0x30000000
Loading: T
TFTP error: 'Access violation' (2)
Starting again
这次的错误是暴力访问，呵呵
lzd> tftp 0x30000000 /srv/tftp/image
dm9000 i/o: 0x20000300, id: 0x90000a46
MAC: 00:80:00:80:00:80
TFTP from server 10.107.4.145; our IP address is 10.107.4.146
Filename '/srv/tftp/image'.
Load address: 0x30000000
Loading: T ###########################################T ######################
#################################################################
#################################################################
#################################################################
###########################################
done
Bytes transferred = 1546996 (179af4 hex)
lzd>
lzd> tftp 0x30000000 image
dm9000 i/o: 0x20000300, id: 0x90000a46
MAC: 00:80:00:80:00:80
TFTP from server 10.107.4.145; our IP address is 10.107.4.146
Filename 'image'.
Load address: 0x30000000
Loading: T #################################################################
#################################################################
#################################################################
#################################################################
###########################################
done
Bytes transferred = 1546996 (179af4 hex)
lzd>
两次都成功了，然后
lzd> go 0x30000000
## Starting application at 0x30000000 ...
Uncompressing Linux.............................................................
crc error
-- System halted
为什么回这样呢？以后在分析。
参考的文章http://weibing.blogbus.com/logs/12146712.html
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