WARNING: at net/sched/sch_generic.c

网络不好用了，一直可以，重新少写了一下uboot后网络就无法连接了，之前用的也是这个uboot，旧时光盘自带的，现在开机网络不会自己启动，我需要ifconfig eth0 xxxxxxxx up 或者net_set才能启动，这个先不管，启动后会显示eth0: link up, 100Mbps, full-duplex, lpa 0xXXXXX的字样，这个证明应该是连接上了，但是ping不同，局域网下也看不到开发板的IP，ping网关的时候出现如下信息：

-----------[ cut here ]------------
WARNING: at net/sched/sch_generic.c:226 dev_watchdog+0x260/0x280()
NETDEV WATCHDOG: eth0 (dm9000): transmit timed out
Modules linked in:
Backtrace:
[<c00257d8>] (dump_backtrace+0x0/0x10c) from [<c0245088>] (dump_stack+0x18/0x1c)
r7:c0301e08 r6:c01daf10 r5:c02e3b68 r4:000000e2
[<c0245070>] (dump_stack+0x0/0x1c) from [<c0033b2c>] (warn_slowpath_common+0x4c/0x80)
[<c0033ae0>] (warn_slowpath_common+0x0/0x80) from [<c0033bac>] (warn_slowpath_fmt+0x30/0x38)
r7:00000000 r6:c3880800 r5:c034f3d0 r4:c0301e2c
[<c0033b7c>] (warn_slowpath_fmt+0x0/0x38) from [<c01daf10>] (dev_watchdog+0x260/0x280)
r3:c3880800 r2:c02e3b80
r4:c0308058
[<c01dacb0>] (dev_watchdog+0x0/0x280) from [<c003d984>] (run_timer_softirq+0x1ac/0x22c)
.
.
.



求助。两天了，还没搞定