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i am new to arm controller.... i am using keil micro vision 3........... while building my code it shows... ***************************************************** startup.o(.text+0x12c):/cygdrive/f/CHECK/check_uart/Startup.s:256: undefined reference to '_start' ____________________________________________________ startup.o(.text+0x140):/cygdrive/f/CHECK/check_uart/Startup.s:256: undefined reference to '_data' ***************************************************** WHAT IT MEANS.......... i am using lpc2148...... i want to learn it properly........ if it is possible give me the maximum details.....links.......