I must write the start up program?

[liuzhao99@mails.tsinghua.edu.cn]

   I know that a start up program is needed when developing a program using gcc
for an embedded system . So must I write the start up program or just use the
crt0.o in newlib? Can anyone tell me the differences between the two methods?
And is there another way?
   Thanks a lot!
  
    



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