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

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Date:	Sun, 14 Jun 2009 22:05:26 -0400
From:	Mike Frysinger <vapier.adi@...il.com>
To:	Robin Getz <rgetz@...ckfin.uclinux.org>
Cc:	Sam Ravnborg <sam@...nborg.org>,
	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 Sun, Jun 14, 2009 at 21:59, Robin Getz wrote:
> On Sun 14 Jun 2009 16:44, Sam Ravnborg pondered:
>> 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.
>
> I think Mike pulled this from some work I did awhile ago, (and sent to you)
> that obviously never got added (since I didn't send it in the proper patch
> format).
>
> http://lkml.indiana.edu/hypermail/linux/kernel/0607.1/0558.html

yeah, the first patch was by Robin ... the "From:" line in the patch
should have shown that (and git-am would have respected) ...
-mike
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