求助：用TFTP烧写到NAND flash中的程序无法运行

板子原先一切正常。本人菜鸟，自己改了些光盘中测试程序中的代码编译后，在Nor flash下启动，通过TFTP模式烧写到NAND flash中，烧写成功。再从NAND flash启动，程序无法运行。于是我怀疑我写的程序有问题，重新烧录光盘中出厂测试程序，依然无法运行。烧录光盘中出厂U-boot也无法运行。烧写过程中，串口输出和手册中的一模一样（有时会出现checksum bad）。烧写U-boot后，从NAND flash启动时，屏发白，四个灯急速闪烁一下后保持不亮状态，串口输出一个乱码。试过n次（n>4），也格式化过NAND flash，情况依然如此。

板子买于2010年12月份，最近才有时间动手，应该是TQ3.5的屏。NAND flash是256M。请教各位大侠，此乃何故。在论坛逛了两日一直没有找到解决方法。如蒙赐教，感激不尽。。

看了好多帖子，都没有列出具体解决办法。连出厂程序（全是201006版）烧进去都执行不了，难道真是uboot的bug或是板子的缺陷？

刚才又实验了一把，步骤如下：选择nor flash启动，按q到命令行模式下，输入tftp 0x30000000 TQ2440_Test.bin 回车，显示
T ###############################
done
Bytes transferred = 444480 (6c840 hex)
然后
EmbedSky> go 0x30000000
显示：
## Starting application at 0x30000000 ...▲*** Warning - bad CRC or NAND, using default environment



##### EmbedSky BIOS for SKY2440/TQ2440 #####
Press Space key to Download Mode !

#####    Boot for Nor Flash Main Menu   #####
#####     EmbedSky USB download mode     #####

[1] Download u-boot or STEPLDR.nb1 or other bootloader to Nand Flash
[2] Download Eboot (eboot.nb0) to Nand Flash
[3] Download Linux Kernel (zImage.bin) to Nand Flash
[5] Download CRAMFS image to Nand Flash
[6] Download YAFFS image (root.bin) to Nand Flash
。。。。
直接重启了。。
看来还不是u-boot的事。SDRAM当中都不行。。
有哪位大侠有解决办法的，是不是板子硬件问题啊？

你用命令7烧写到内存试试看呢。
u-boot的这个功能是测试过的。用来烧写linux、文件系统、u-boot、开机logo、裸机测试程序都是OK的。

先谢谢了。用上述方法串口信息
*** Warning - bad CRC or NAND, using default environment



##### EmbedSky BIOS for SKY2440/TQ2440 #####
Press Space key to Download Mode !

#####    Boot for Nor Flash Main Menu   #####
#####     EmbedSky USB download mode     #####

[1] Download u-boot or STEPLDR.nb1 or other bootloader to Nand Flash
[2] Download Eboot (eboot.nb0) to Nand Flash
[3] Download Linux Kernel (zImage.bin) to Nand Flash
[5] Download CRAMFS image to Nand Flash
[6] Download YAFFS image (root.bin) to Nand Flash
[7] Download Program (uCOS-II or TQ2440_Test) to SDRAM and Run it
[8] Boot the system
[9] Format the Nand Flash
[0] Set the boot parameters
[a] Download User Program (eg: uCOS-II or TQ2440_Test)
Download LOGO Picture (.bin) to Nand  Flash
[l] Set LCD Parameters
[n] Enter TFTP download mode menu
[o] Download u-boot to Nor Flash
[r] Reboot u-boot
[t] Test Linux Image (zImage)
[q] quit from menu
Enter your selection: n
#####    Boot for Nor Flash Main Menu   #####
#####     EmbedSky TFTP download mode     #####

[1] Download u-boot.bin to Nand Flash
[2] Download Eboot (eboot.nb0) to Nand Flash
[3] Download Linux Kernel (zImage.bin) to Nand Flash
[4] Download stepldr.nb1 to Nand Flash
[5] Set TFTP parameters(PC IP,TQ2440 IP,Mask IP...)
[6] Download YAFFS image (root.bin) to Nand Flash
[7] Download Program (uCOS-II or TQ2440_Test) to SDRAM and Run it
[8] Boot the system
[9] Format the Nand Flash
[0] Set the boot parameters
[a] Download User Program (eg: uCOS-II or TQ2440_Test)
Download LOGO Picture (.bin) to Nand  Flash
[l] Set LCD Parameters
[o] Download u-boot to Nor Flash
[p] Test network (TQ2440 Ping PC's IP)
[r] Reboot u-boot
[t] Test Linux Image (zImage)
[q] Return main Menu
Enter your selection: 7
Enter downloads to SDRAM address:
0x30000000
Enter program name:
TQ2440.bin
tftp 0x30000000 TQ2440.bin
dm9000 i/o: 0x20000300, id: 0x90000a46
MAC: 0a:1b:2c:3d:4e:5f
TFTP from server 192.168.1.8; our IP address is 192.168.1.6
Filename 'TQ2440.bin'.
Load address: 0x30000000
Loading: checksum bad
checksum bad
checksum bad
checksum bad
checksum bad
checksum bad
checksum bad
checksum bad
checksum bad
T checksum bad
checksum bad
#checksum bad
##############################
done
Bytes transferred = 444480 (6c840 hex)
## Starting application at 0x30000000 ...
*** Warning - bad CRC or NAND, using default environment



##### EmbedSky BIOS for SKY2440/TQ2440 #####
Press Space key to Download Mode !

#####    Boot for Nor Flash Main Menu   #####
#####     EmbedSky USB download mode     #####

[1] Download u-boot or STEPLDR.nb1 or other bootloader to Nand Flash
[2] Download Eboot (eboot.nb0) to Nand Flash
[3] Download Linux Kernel (zImage.bin) to Nand Flash
[5] Download CRAMFS image to Nand Flash
[6] Download YAFFS image (root.bin) to Nand Flash
[7] Download Program (uCOS-II or TQ2440_Test) to SDRAM and Run it
[8] Boot the system
[9] Format the Nand Flash
[0] Set the boot parameters
[a] Download User Program (eg: uCOS-II or TQ2440_Test)
Download LOGO Picture (.bin) to Nand  Flash
[l] Set LCD Parameters
[n] Enter TFTP download mode menu
[o] Download u-boot to Nor Flash
[r] Reboot u-boot
[t] Test Linux Image (zImage)
[q] quit from menu
Enter your selection:

屏幕闪了一下，就自动重启了。接着求解。。。（TQ2440.bin为光盘中自带程序。）

把这个镜像烧写到Nand里面能不能从nand启动后正常运行呢？

6# 亚瑟王
不可以，一楼帖子，白屏四个灯急快的闪一下，貌似执行一小段就出错了。uboot，测试程序，linux都不行。