eth0:TX underrun, resetting buffers解决方法

问题来源

这两天在做boa的时候发现at91的板子在web服务运行以后偶尔会出现eth0：TXunderrun,resetting buffers的问题。Google之相关解释如下：

The AT91SAM926x CPU only has a small on-chip buffer for the Ethernet port. The TX under run may occur under heavy networktraffic. The patch that uses on-chip SRAM as buffer suppose to fix the problem. Make sure you have the following configuration for your kernel build：

Ethernet (10 or 100Mbit) --->
           <*> Atmel MACB support
                    Atmel MACB TX buffers in internal SRAM

Ethernet (10 or 100Mbit) --->

<*> Atmel MACB support

Atmel MACB TX buffers in internal SRAM

但是下载官方的linux-2.6.30源码和at91的2.6.30-at91.patch.gz并不能解决问题，但是在2.6.30-at91-exp.4.tar.gz中有2.6.30-at91-exp.4-0009-Add-MACB-TX-Buffer-in-SRAM-support.patch，这只是补丁包中的一个，它的作用是Add MACB TXBuffer in SRAM support。

补丁安装

 [root@w3sun src]#wget https://www.kernel.org/pub/linux/kernel/v2.6/linux-2.6.30.tar.gz
 [root@w3sun src]#tar xvzf linux-2.6.30.tar.gz

1 2	[root@w3sun src]#wget https://www.kernel.org/pub/linux/kernel/v2.6/linux-2.6.30.tar.gz [root@w3sun src]#tar xvzf linux-2.6.30.tar.gz

下载2.6.30-at91.patch.gz和2.6.30-at91-exp.4.tar.gz并且将2.6.30-at91.patch.gz和2.6.30-at91-exp.4.tar.gz解压缩后的文件夹放入liux-2.6.30文件夹中。打补丁的顺序为：先官方后社区

[root@w3sun linux-2.6.30]#zcat 2.6.30-at91.patch.gz | patch –p1

1	[root@w3sun linux-2.6.30]#zcat 2.6.30-at91.patch.gz \| patch –p1

100%

[root@w3sun linux-2.6.30]#for p in 2.6.30-at91-exp.4/*; do patch -p1 < $p ; done

1	[root@w3sun linux-2.6.30]#for p in 2.6.30-at91-exp.4/*; do patch -p1 < $p ; done

100%

在这里提一下打好补丁的新内核的配置中容易出现的错误和关于ECC的问题：

drivers/net/dm9000.c: In function 'dm9000_probe':
drivers/net/dm9000.c:1356: error: 'struct net_device' has no member named 'open'
drivers/net/dm9000.c:1357: error: 'struct net_device' has no member named 'hard_start_xmit'
drivers/net/dm9000.c:1358: error: 'struct net_device' has no member named 'tx_timeout'
drivers/net/dm9000.c:1360: error: 'struct net_device' has no member named 'stop'
drivers/net/dm9000.c:1361: error: 'struct net_device' has no member named 'set_multicast_list'
drivers/net/dm9000.c:1363: error: 'struct net_device' has no member named 'do_ioctl'
make[2]: *** [drivers/net/dm9000.o] Error 1
make[1]: *** [drivers/net] Error 2
make: *** [drivers] Error 2

drivers/net/dm9000.c: In function 'dm9000_probe':

drivers/net/dm9000.c:1356: error: 'struct net_device' has no member named 'open'

drivers/net/dm9000.c:1357: error: 'struct net_device' has no member named 'hard_start_xmit'

drivers/net/dm9000.c:1358: error: 'struct net_device' has no member named 'tx_timeout'

drivers/net/dm9000.c:1360: error: 'struct net_device' has no member named 'stop'

drivers/net/dm9000.c:1361: error: 'struct net_device' has no member named 'set_multicast_list'

drivers/net/dm9000.c:1363: error: 'struct net_device' has no member named 'do_ioctl'

make[2]: *** [drivers/net/dm9000.o] Error 1

make[1]: *** [drivers/net] Error 2

make: *** [drivers] Error 2

解决方法如图选中：

当官方内核和社区内核都打好以后，配置AT91的ECC的时候发现原来的选项里没有了ECCNONE的选项，进入arch/arm/configs/目录并查看并找出与ECC相关的项。

[root@w3sun linux-2.6.30]#cat at91sam9263ek_defconfig | grep ECC

1	[root@w3sun linux-2.6.30]#cat at91sam9263ek_defconfig \| grep ECC

内核配置项按shift+? 显示和driver/mtd/nand/Kconfig有关，进入文件中查看发现其依赖Kernel debug，于是乎在kernel hacking中选择即可解决问题。

关于busybox

//关于busybox的Don't use /usr
        Busybox Settings --->
                Installation Options --->
                            [*] Don't use /usr

//关于busybox的Don't use /usr

Busybox Settings --->

Installation Options --->

[*] Don't use /usr

Don’t use /usr：假如你选的默认的安装路径_install,那么busybox安装的时候就会在_install下生成bin、sbin、linuxrc，不生成usr目录；如果不选的话，就会生成bin、sbin、linuxrc、usr四个文件

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eth0:TX underrun, resetting buffers解决方法

问题来源

补丁安装

关于busybox

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