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infomation about the startup-file

Hello,

could anybody give me a good introduction (in the www) about the startup-file? I took a look into the startup-file from the AT91RM9200.

I want to know what's the meaning about every line in such a file to understand it better.

e.g.

UND_Stack_Size EQU 0x00000000
ABT_Stack_Size EQU 0x00000000

I don't know why the size is here always zero.

AREA STACK, NOINIT, READWRITE, ALIGN=3

what's the meaning about the factor "ALIGN=3"?

why is the size of the heap zero?

and so on...

best regards
bernd

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