Re: same routines in multiple overlays

[Paul Koning <pkoning at equallogic dot com>]

>>>>> "Oliver" == Oliver Wohlmuth <oliver.wohlmuth@freescale.com> writes:

 Oliver> Hello, I'm using overlays to load time critical routines from
 Oliver> external memory into on-chip memory.  Depending on what
 Oliver> "codec" is used, the appropriate overlay is loaded. This
 Oliver> works fine so far.

 Oliver> The problem is, that some routines are shared between
 Oliver> different overlay (i.e. codecs). So far I defined a
 Oliver> non-overlay area in on-chip memory to hold this common time
 Oliver> critical routines.  But not all common code is needed by all
 Oliver> codecs; so I'm not utilizing the on-chip memory the most
 Oliver> efficient way. Actually I'm running out of on-chip memory!

 Oliver> Here comes my question: Is there a way in the linker script
 Oliver> to tell ld (version 2.16.1) to move a static library into
 Oliver> multiple overlays ? If not, does anybody know of other way to
 Oliver> achieve this ?

I've never used overlays in ld, but I used them a lot back in the old
days of PDP-11s.

The most efficient answer is a tree structured overlay setup (as in
TKB, in RSX-11).  The other answer that might work is multiple overlay
regions: one to hold semi-common pieces, the other to hold the
individual bits (as in RT-11).  If you can do either of these,
preferably the former, you should be able to achieve what you need.

	   paul