小弟最近移植Linux3.2.48，在移植的过程中，出现了dm9000 dm9000: read wrong id 0x2b2a2928的错误，但是我可以通过开发板ping通虚拟机的tftp和nfs主机，请问前辈们，这是什么原因呢？如果ping的通，那么我的DM9000驱动因该就是正确的，而且通过tftp上传内核uImage，并启动内核都正常，那为什么会出现上面的错误呢？
这是我的启动参数配置
bootargs=noinitrd console=ttySAC0,115200 root=/dev/nfs nfsroot=192.168.1.99:/home/linux/nfsdir ip=192.168.1.88
以下是错误代码
......
dm9000 Ethernet Driver, V1.31
dm9000 dm9000: read wrong id 0x2b2a2928
dm9000 dm9000: read wrong id 0x2b2a2928
dm9000 dm9000: read wrong id 0x2b2a2928
dm9000 dm9000: read wrong id 0x2b2a2928
dm9000 dm9000: read wrong id 0x2b2a2928
dm9000 dm9000: read wrong id 0x2b2a2928
dm9000 dm9000: read wrong id 0x2b2a2928
dm9000 dm9000: read wrong id 0x2b2a2928
dm9000 dm9000: wrong id: 0x2b2a2928
dm9000 dm9000: not found (-19).
mousedev: PS/2 mouse device common for all mice
S3C24XX RTC, (c) 2004,2006 Simtec Electronics
s3c-rtc s3c64xx-rtc: rtc disabled, re-enabling
s3c-rtc s3c64xx-rtc: rtc core: registered s3c as rtc0
TCP cubic registered
NET: Registered protocol family 17
Registering the dns_resolver key type
VFP support v0.3: implementor 41 architecture 3 part 30 variant c rev 2
s3c-rtc s3c64xx-rtc: setting system clock to 2013-07-18 08:08:46 UTC (1374134926)
VFS: Unable to mount root fs via NFS, trying floppy.
VFS: Cannot open root device "nfs" or unknown-block(2,0)
Please append a correct "root=" boot option; here are the available partitions:
1f00 1024 mtdblock0 (driver?)
1f01 5120 mtdblock1 (driver?)
1f02 81920 mtdblock2 (driver?)
1f03 174080 mtdblock3 (driver?)
Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(2,0)
[<80018f84>] (unwind_backtrace+0x0/0xf0) from [<8026dc08>] (panic+0x70/0x1ac)
[<8026dc08>] (panic+0x70/0x1ac) from [<80341c20>] (mount_block_root+0x15c/0x210)
[<80341c20>] (mount_block_root+0x15c/0x210) from [<80341e9c>] (mount_root+0xd8/0xf4)
[<80341e9c>] (mount_root+0xd8/0xf4) from [<80342018>] (prepare_namespace+0x160/0x1b8)
[<80342018>] (prepare_namespace+0x160/0x1b8) from [<803418d8>] (kernel_init+0xf4/0x12c)
[<803418d8>] (kernel_init+0xf4/0x12c) from [<80014884>] (kernel_thread_exit+0x0/0x8)
