Cross gcc Mailing List Archive

Re: volital registers

Date: 11 Nov 1996 11:36:56 GMT
From:
JYoungman@vggas.com (James Youngman)
Reply-To:
JYoungman@vggas.com (James Youngman)
Content-Type: Text/Plain; charset=US-ASCII
Newsgroups: vggas.lists.cygnus.crossgcc
Organization: VG Gas Analysis Systems
References: <55dmdv$j7v@halon.vggas.com>

In article <55dmdv$j7v@halon.vggas.com>, nev@snet.net says...
>#define SCSR (*(unsigned short *)0xfffC0C)
>
>This works OK until the the I do this
>
>        while (SCSR & 0X0100)  
>                ;

>How do specify pointer to a volital area in memory?
>#define SCSR (*(volatile unsigned short *)0xfffC0C)

>
>OR
>
>I would like to have the CPU's internal I/O show up 
>in the linker map
>so that if someone tries to map something else in 
>the same location the
>linker will give a warning or error.

You can do it in the linker script.
Linker scripts are well explained in the manual that comes with ld.

-- 
James Youngman       VG Gas Analysis Systems |The trouble with the rat-race 
 Before sending advertising material, read   |is, even if you win, you're 
http://www.law.cornell.edu/uscode/47/227.html|still a rat.

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