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dmtimer2 interrupt is not working in Starterware BootLoader

Hi,

I am using Sitara am335x EVM-SK board. I am developing led blinking code using timer interrupt. for that I downloaded AM335X_StarterWare_02_00_01_01 software. I am using bootloader code for developing simple led blinking code, for delay functionality I added timer example code which was written for dmtimer2 into bootloader code. this dmtimer2 example code is set for overflow  interrupt which will overflow after counter overflow. I tested this code on DDR its working fine, but if I add this code into bootloader its interrupt is not working. ISR is not called by system.

will you tell me what I am missed out while running same code which is merged into bootloader code..?

Regards,

Vishvajeet.