【求助】uboot下ping不通电脑

jmxl

开发板：EK140，128M，NAND
现象：开发板ping不通电脑。
补充：网线连接没有问题，电脑ip设置正确。进入Linux就可以ping通了，但uboot下不可以。
log:

1. U-Boot 2016.03-svn350 (Jan 10 2019 - 17:42:08 +0800)
   
2. 
   
3. CPU:   Freescale i.MX6ULL rev1.1 528 MHz (running at 396 MHz)
   
4. CPU:   Commercial temperature grade (0C to 95C) at 51C
   
5. Reset cause: POR
   
6. Board: MYIMX6EK140-6Y
   
7. I2C:   ready
   
8. DRAM:  128 MiB
   
9. force_idle_bus: sda=1 scl=0 sda.gp=0x72 scl.gp=0x67
   
10. force_idle_bus: failed to clear bus, sda=1 scl=0
    
11. NAND:  128 MiB
    
12. MMC:   FSL_SDHC: 0
    
13. *** Warning - bad CRC, using default environment
    
14. 
    
15. Display: MY-WVGA (800x480)
    
16. Video: 800x480x24
    
17. In:    serial
    
18. Out:   serial
    
19. Err:   serial
    
20. Net:   FEC [PRIME]
    
21. Normal Boot
    
22. Hit any key to stop autoboot:  0
    
23. => ping 192.168.137.99
    
24. Using FEC device
    
25. ping failed; host 192.168.137.99 is not alive
    
26. =>
    

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