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blinky issue with SDK7.2

I am using PCA10031 dongle with SDK 7.2. I tried the blinky example in peripheral directory. Unfortunately it didn't work for me. When I use the makefile from blank/armgcc, the compilation goes smoothly, but I do not see nrf_delay_ms in the .map file that is created. Any idea why?

Also, I am using JLink to flash the binary from Linux command line (using nrf51822 as the device). The flash procedure itself seems to work fine, but the LED is not blinking.

I do not see any such problem with PCA10000 dongle that I have. The LED flashes well on PCA10000 and the .map file shows nrf_delay_ms as well.