software reset on sharc after second stage loaders

Hi, all

     According to the EE-345 note, I use SPI flash boot mode and run the second stage loader on sharc 21479. After I write the .ldr file to the flash, I am running software reset, I want the DSP run the new program  and  I failed. But if I only power down and power up the DSP, the new program work. I want to known how I can reset the DSP after I write the ldr file to flash and the new program will work?

Best reagrds.