u-boot-2009.08已经对DM9000x网卡有很好的支持了，只是默认的是CS8900网卡，所以我们只需在yy2440.h中添加相应的宏定义就可以了，修改如下：[参考黄刚大侠的博客修改]
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/*
* Hardware drivers
*/
#if 0
#define CONFIG_DRIVER_CS8900 1 /* we have a CS8900 on-board */
#define CS8900_BASE 0x19000300
#define CS8900_BUS16 1 /* the Linux driver does accesses as shorts */
#endif
//添加u-boot对DM9000X网卡的支持
#define CONFIG_DRIVER_DM9000 1
#define CONFIG_NET_MULTI 1
#define CONFIG_DM9000_NO_SROM 1
#define CONFIG_DM9000_BASE 0x20000300 //网卡片选地址
#define DM9000_IO CONFIG_DM9000_BASE
#define DM9000_DATA (CONFIG_DM9000_BASE + 4) //网卡数据地址
#define CONFIG_DM9000_USE_16BIT 1
#define CONFIG_CMD_PING
//恢复被注释掉的网卡MAC地址和修改你合适的开发板IP地址
#define CONFIG_ETHADDR 08:00:3e:26:0a:5b //开发板MAC地址
#define CONFIG_NETMASK 255.255.255.0
#define CONFIG_IPADDR 192.168.1.105 //开发板IP地址
#define CONFIG_SERVERIP 192.168.1.103 //Linux主机IP地址 |
在yy2440.c中添加如下函数和头文件
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#include <net.h>
#include <netdev.h>
#ifdef CONFIG_DRIVER_DM9000
int board_eth_init(bd_t *bis)
{
return dm9000_initialize(bis);
}
#endif
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修改MD9000网卡驱动代码，如下：
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#gedit drivers/net/dm9000x.c
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#if 0 //屏蔽掉dm9000_init函数中的这一部分，不然使用网卡的时候会报“could not establish link”的错误
i = 0;
while (!(phy_read(1) & 0x20)) { /* autonegation complete bit */
udelay(1000);
i++;
if (i == 10000) {
printf("could not establish link ");
return 0;
}
}
#endif
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这是修改的还ping不通，出现
DM9000: running in 16 bit mode
MAC: 08:00:3e:26:0a:5b
operating at unknown: 0 mode
Using dm9000 device
需修改dm9000x.c里面的函数
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/*
Stop the interface.
The interface is stopped when it is brought.
*/
static void dm9000_halt(struct eth_device *netdev)
{
//DM9000_DBG("%sn", __func__);
///* RESET devie */
//phy_write(0, 0x8000); /* PHY RESET */
//DM9000_iow(DM9000_GPR, 0x01); /* Power-Down PHY */
//DM9000_iow(DM9000_IMR, 0x80); /* Disable all interrupt */
//DM9000_iow(DM9000_RCR, 0x00); /* Disable RX */
}
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此时出现tftp下载断断续续的情况
Loading: T T T T #T T ########T ##T #######T #####T ##
Retry count exceeded; starting again
dm9000 i/o: 0x20000300, id: 0x90000a46
DM9000: running in 16 bit mode
MAC: 08:00:3e:26:0a:5b
operating at unknown: 0 mode
Using dm9000 device
TFTP from server 192.168.0.111; our IP address is 192.168.0.123
Filename 'zImage'.
Load address: 0x30008000
Loading: T T #T T #T T ##############T ##T ##############T ###########T ##
和黄刚大侠遇到的情况一样，把板子和电脑用网线直接连起来，照黄大侠的说法把板子和电脑直接相连也不行！奇怪，出厂烧进去的u-boot用路由器也可以的呀。不急，好好找找原因
到现在，网卡是移植好了！
看着错误的原因貌似是因为超时而导致网卡重启，grep了Retry count exceeded; starting 发现在tftp.c里面puts了一次，既然是tftp，就先看他吧，试着修改了下面这个函数，在TftpTimeoutCountMax乘以10，断续还是会，只是没刚才那么严重，可以将内核下载完成，说明方向对了，但是没找到点上。
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TftpTimeout (void)
{
if (++TftpTimeoutCount > TftpTimeoutCountMax) {
puts ("\nRetry count exceeded; starting again\n");
#ifdef CONFIG_MCAST_TFTP
mcast_cleanup();
#endif
NetStartAgain ();
} else {
puts ("T ");
NetSetTimeout (TftpTimeoutMSecs, TftpTimeout);
TftpSend ();
}
}
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继续在网上游荡，也自己试着修改代码，看到一个网友遇到TFTP error: 'Unsupported option(s) requested (8)这样的情况，我也遇到了，当
TftpTimeoutCountMax乘以一个太大的数的时候就会出现这样的情况，顺便也看了他的调试方法，找到了断续传输的原因所在，他是这样说的
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一、问题原因分析：
1、下载与我操作系统版本（fedora 10）一致的tftp server源代码tftp-hpa-0.48.tar.bz2，编译通过后，替换系统的tftpd程序，通过在源代码中添加调试信息，发现是由于 Uboot 端 tftp 程序传过来的Timeout参数不符合服务器端定义引起的：
Nov 11 10:46:12 HardWare in.tftpd[18275]: client timeout = 7810 , server timeout = 1-255 tftp客户端传过来的timeout是7810，而服务器端定义的范围在1-255秒之间，不是服务器的问题，而是uboot中tftp参数设置的问题。
原文链接地址：http://blog.chinaunix.net/u3/105764/showart.php?id=2091464 |
按照这个思路修改了tftp.c中的
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#define TIMEOUT 50000 /* Millisecs to timeout for lost pkt */
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编译后烧进去却出现这样的问题：
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TFTP from server 192.168.0.111; our IP address is 192.168.0.123
Filename 'zImage'.
Load address: 0x33008000
Loading: *
ARP Retry count exceeded; starting again
dm9000 i/o: 0x20000300, id: 0x90000a46
DM9000: running in 16 bit mode
MAC: 08:00:3e:26:0a:5b
operating at unknown: 0 mode
Using dm9000 device
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同样是还没传输开始就被打断了，继续grep
ARP Retry count exceeded; starting again 在net.c里面发现了，打开看，同样有这样的定义
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#ifndef CONFIG_ARP_TIMEOUT
# define ARP_TIMEOUT 5000UL /* Milliseconds before trying ARP again */
#else
# define ARP_TIMEOUT CONFIG_ARP_TIMEOUT
#endif
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好，也把你改为，也就是去掉毫秒的单位
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#ifndef CONFIG_ARP_TIMEOUT
# define ARP_TIMEOUT 5000 /* Milliseconds before trying ARP again */
#else
# define ARP_TIMEOUT CONFIG_ARP_TIMEOUT
#endif
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编译烧写，发现第一次都会有断续，但是第二次就没有了，行了，将就着用吧
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YY2440 # tftp 30008000 zImage
dm9000 i/o: 0x20000300, id: 0x90000a46
DM9000: running in 16 bit mode
MAC: 08:00:3e:26:0a:5b
operating at unknown: 0 mode
Using dm9000 device
TFTP from server 192.168.0.111; our IP address is 192.168.0.123
Filename 'zImage'.
Load address: 0x30008000
Loading: *
ARP Retry count exceeded; starting again
dm9000 i/o: 0x20000300, id: 0x90000a46
DM9000: running in 16 bit mode
MAC: 08:00:3e:26:0a:5b
operating at unknown: 0 mode
Using dm9000 device
TFTP from server 192.168.0.111; our IP address is 192.168.0.123
Filename 'zImage'.
Load address: 0x30008000
Loading: *
ARP Retry count exceeded; starting again
dm9000 i/o: 0x20000300, id: 0x90000a46
DM9000: running in 16 bit mode
MAC: 08:00:3e:26:0a:5b
operating at unknown: 0 mode
Using dm9000 device
TFTP from server 192.168.0.111; our IP address is 192.168.0.123
Filename 'zImage'.
Load address: 0x30008000
Loading: *
ARP Retry count exceeded; starting again
dm9000 i/o: 0x20000300, id: 0x90000a46
DM9000: running in 16 bit mode
MAC: 08:00:3e:26:0a:5b
operating at unknown: 0 mode
Using dm9000 device
TFTP from server 192.168.0.111; our IP address is 192.168.0.123
Filename 'zImage'.
Load address: 0x30008000
Loading: *
ARP Retry count exceeded; starting again
dm9000 i/o: 0x20000300, id: 0x90000a46
DM9000: running in 16 bit mode
MAC: 08:00:3e:26:0a:5b
operating at unknown: 0 mode
Using dm9000 device
TFTP from server 192.168.0.111; our IP address is 192.168.0.123
Filename 'zImage'.
Load address: 0x30008000
Loading: *
ARP Retry count exceeded; starting again
dm9000 i/o: 0x20000300, id: 0x90000a46
DM9000: running in 16 bit mode
MAC: 08:00:3e:26:0a:5b
operating at unknown: 0 mode
Using dm9000 device
TFTP from server 192.168.0.111; our IP address is 192.168.0.123
Filename 'zImage'.
Load address: 0x30008000
Loading: *
ARP Retry count exceeded; starting again
dm9000 i/o: 0x20000300, id: 0x90000a46
DM9000: running in 16 bit mode
MAC: 08:00:3e:26:0a:5b
operating at unknown: 0 mode
Using dm9000 device
TFTP from server 192.168.0.111; our IP address is 192.168.0.123
Filename 'zImage'.
Load address: 0x30008000
Loading: #################################################################
#################################################################
##########
done
Bytes transferred = 2052152 (1f5038 hex)
YY2440 # tftp 30008000 zImage
dm9000 i/o: 0x20000300, id: 0x90000a46
DM9000: running in 16 bit mode
MAC: 08:00:3e:26:0a:5b
operating at unknown: 0 mode
Using dm9000 device
TFTP from server 192.168.0.111; our IP address is 192.168.0.123
Filename 'zImage'.
Load address: 0x30008000
Loading: #################################################################
#################################################################
##########
done
Bytes transferred = 2052152 (1f5038 hex)
YY2440 #
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2010.7.31
今日有新发现，tftp断断续续的原因是电脑网卡的反应时间和uboot里面每次重启时间搭配不好，以前一直重新连接，不能下载，是没等电脑网卡反应过来，并且还要经过虚拟机的虚拟网卡，tftp连接就重启了，故不能下载：
解决办法之一是：修改net/tftp.c里面# define TIMEOUT_COUNT这个宏定义，代表重启前的重试次数，把次数加大，比如夸张点1000次才重启，那么电脑网卡就有充足的时间来完成初始化，只要连接上了，就可以下载了。
方法二是：修改每次重试的等待时间，修改net/tftp.c里面的#define TIMEOUT5 0000UL 和net/net.c里面的# define ARP_TIMEOUT 50000UL，比原来多加个0，大点无所谓，只要是使网卡有足够的反应时间。
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