in mdk305 when i build target it report the error: **************************************************** build target 'lpc2106'
assembling startup.s...
/cygdrive/c/cygnus/arm-tools/bin/../lib/gcc-lib/arm-thunb-elf/3.3.1/../../../../arm-thumb-elf/bin/ld: warning:cannot find entry symbol _startï¼›defaulting to 00008000
startup.o(.text+0x12c):/cygdrive/d/allwork/keil/startup.s:400:undefined reference to '_start'
startup.o(.text+0x12c):/cygdrive/d/allwork/keil/startup.s:400:undefined reference to '_data'
collect2: ld returned 1 exit status
target not created ******************************************************* what does it mean?and how to resolve it