tftp下载出现问题

1. #####    Boot for TQ210 Main Menu       #####
   
2. #####     EmbedSky TFTP download mode     #####
   
3. 
   
4. [1] Download bootloader (u-boot or bootimage) to Nand Flash
   
5. [2] Download WinCE NK image (NK.bin) to Nand Flash
   
6. [3] Download Linux Kernel (zImage.bin) to Nand Flash
   
7. [4] Download LOGO Picture (logo.bin) to Nand  Flash
   
8. [5] Download UBIFS image (root.ubi) to Nand Flash
   
9. [6] Download YAFFS image (root.bin) to Nand Flash
   
10. [7] Download Program to SDRAM and Run it
    
11. [8] Boot the system
    
12. [9] Format the Nand Flash
    
13. [0] Set the boot parameters
    
14. [a] Download User Program
    
15. [n] Set TFTP parameters(PC IP,TQ210 IP,Mask IP,image name...)
    
16. [p] Test network (TQ210 Ping PC's IP)
    
17. [r] Reboot u-boot
    
18. [t] Test Linux Image (zImage)
    
19. [u] Download bootloader to SD Card
    
20. [q] Return main Menu
    
21. Enter your selection: 3
    
22. dm9000 i/o: 0x88000000, id: 0x90000a46
    
23. DM9000: running in 16 bit mode
    
24. MAC: 00:40:5c:26:0a:5b
    
25. operating at 10 FULL duplex mode
    
26. TFTP from server 192.168.1.8; our IP address is 192.168.1.2
    
27. Filename 'zImage.bin'.
    
28. Load address: 0xc0008000
    
29. Loading: #################################################################
    
30.          #################################################################
    
31.          #################################################################
    
32.          #################################################################
    
33.          #################################################################
    
34.          ###############
    
35. done
    
36. Bytes transferred = 4989208 (0x4c2118)
    
37. 
    
38. NAND erase: device 0 offset 0x500000, size 0x500000
    
39. Erasing at 0x9e0000 -- 100% complete.
    
40. OK
    
41. 
    
42. NAND write: device 0 offset 0x500000, size 0x4c2118
    
43. 
    
44. Writing data at 0x9c2000 -- 100% complete.
    
45. 4989208 bytes written: OK
    
46. 
    
47. #####    Boot for TQ210 Main Menu       #####
    
48. #####     EmbedSky TFTP download mode     #####
    
49. 
    
50. [1] Download bootloader (u-boot or bootimage) to Nand Flash
    
51. [2] Download WinCE NK image (NK.bin) to Nand Flash
    
52. [3] Download Linux Kernel (zImage.bin) to Nand Flash
    
53. [4] Download LOGO Picture (logo.bin) to Nand  Flash
    
54. [5] Download UBIFS image (root.ubi) to Nand Flash
    
55. [6] Download YAFFS image (root.bin) to Nand Flash
    
56. [7] Download Program to SDRAM and Run it
    
57. [8] Boot the system
    
58. [9] Format the Nand Flash
    
59. [0] Set the boot parameters
    
60. [a] Download User Program
    
61. [n] Set TFTP parameters(PC IP,TQ210 IP,Mask IP,image name...)
    
62. [p] Test network (TQ210 Ping PC's IP)
    
63. [r] Reboot u-boot
    
64. [t] Test Linux Image (zImage)
    
65. [u] Download bootloader to SD Card
    
66. [q] Return main Menu
    
67. Enter your selection: 6
    
68. dm9000 i/o: 0x88000000, id: 0x90000a46
    
69. DM9000: running in 16 bit mode
    
70. MAC: 00:40:5c:26:0a:5b
    
71. operating at 10 FULL duplex mode
    
72. TFTP from server 192.168.1.8; our IP address is 192.168.1.2
    
73. Filename 'root.bin'.
    
74. Load address: 0x40008000
    
75. Loading: *
    
76. ARP Retry count exceeded; starting again

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tftp下载 时好时坏是什么原因