Can't work with Serial Flash Loader and sflash.exe

Hi all,

When I use the Serial Flash Loader and sflash.exe from the http://www.luminarymicro.com/products/software_updates.html, it can't run my application right. Any suggestion?
I do it as the below:
1. Download the tgpio.bin with Jtag with address 0x0,it work right.
2. Then download bootloader.bin with address 0x0, and download tgpio.bin with 0x800 as below:
G:TrainingbookLuminary_docdatasheetSoftwareBootloaderSerial Flash Loader>
sflash tgpio.bin -p 0x800 -r 0x9c4 -c 1

Application : tgpio.bin
Program Address: 0x800
COM Port: COM1
Baud Rate: 115200
Erasing Flash:
Remaining Bytes: 00000000
Running from address 000009c4
Successfully downloaded to device.

But I can't observe the app blink the LED as download it with 0x0.

I also use jtag to verify the bin file downloading with sflash, which is indeed same as bin file.

And when I using jtag change PC to it, it will work right.

I doubt the bootloader don't run my app right, Or it should blink the LED.

I hope someone can help me, thanks.

johnson