linux-kernel - Re: scripts/kallsyms: extending region checking for Blackfin memory regions

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Message-ID: <20090614204437.GC3187@uranus.ravnborg.org>
Date:	Sun, 14 Jun 2009 22:44:37 +0200
From:	Sam Ravnborg <sam@...nborg.org>
To:	Mike Frysinger <vapier.adi@...il.com>
Cc:	kbuild-devel@...ts.sourceforge.net,
	Linux kernel mailing list <linux-kernel@...r.kernel.org>,
	uclinux-dist-devel <uclinux-dist-devel@...ckfin.uclinux.org>
Subject: Re: scripts/kallsyms: extending region checking for Blackfin memory regions

On Mon, Jun 08, 2009 at 07:23:16PM -0400, Mike Frysinger wrote:
> intro: the current Blackfin memory architecture is (1) no virtualized
> memory and (2) distinctly harvard.  that means we cannot create a
> linear map of start/end text sections.  we end up with distinct
> regions like so:
> 00001000 T __stext
> 000dc4c0 T __etext
> feb00000 A __etext_l2
> feb00010 A __stext_l2
> ffa00000 T __stext_l1
> ffa0160c T __etext_l1
> this is because external memory starts at address 0 while on-chip
> regions have different discontiguous hardcoded addresses (L1
> instruction in this case starts at 0xffa00000 while L2 starts at
> 0xfeb00000).
> 
> the current kallsyms is written to search for the special stext/etext
> symbols only which means the resulting kallsyms output knows nothing
> of the Blackfin symbols living in these on-chip regions.  we've
> written two patches to fix this: the first one is straight forward and
> simply copies & pastes the existing hardcoded regions.  the second
> creates an array of text regions which makes it much easier to extend
> in the future for other people (and can be squashed into the first
> one).
> 
> doesnt matter to me which method is picked :)

I added both as I liked the generalization.
I had to rearrange the "Signed-off-by" in the first patch
as this patch came in vai you and not Robin.

	Sam
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