Hi Pavel :
Thanks for your reply!
When watchdog is overflow, I did see reboot message.
I use SD card that comes from with TI8148 EVM board, so firmware is very old.
Since I use DVSDK, I do not have latest version of EZSDK.
Could you give me your uImage, and I can try on our EVM board?
I think if it is a software issue, it should be related with kernel not uboot, right?
I have latest DVSDK and I will try again on EVM board and let you know the result.
Best regards,
Marcus