Undefined References in crt0.S

[Robert Floyd]

I created a basic linker script (maybe too basic) from examples and
information on the web.  Here is what I have:


OUTPUT_FORMAT("srec")
OUTPUT_ARCH(sh)

MEMORY
{
   rom : o = 0, l = 512k
}

SECTIONS
{
   .flash  0 :
	{
	  __ftext =  . ;
	  *(.text)
	  *(.strings)
	  __etext =	 . ;
	  __fdata =	 . ;
	  *(.data)
	  __edata =	 . ;
	}  > rom
}

However, this linker script gives me two errors that has some relation
to crt0.S:

../lib/crt0.o .... :crt0.S: undefined reference to '_edata'
../lib/crt0.o .... :crt0.S: undefined reference to '_end'

I notice that in my cmd linker script I have __fdata = . ; which I took
from an example.  Is this the line that crt0.S is looking for?  Does
anyone know where _end should be place and the syntax for it use? And
what is this file crt0.o?  Thanks for any help on this.

R.Floyd

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