Tom Rini wrote:
>On Tue, Apr 23, 2002 at 03:40:19PM +1000, Brendan J Simon wrote:
>
>>Does anyone know if kbuild-2.5-release-1.12 supports the embedded ppc
>>boards ?
>>I've managed to configure the 2.4.18-pre8 kernel for a custom board.
>>"make installable" creates the vmlinux file but the embedded wrapper
>>isn't created.
>>
>Correct. At the time the stuff in arch/ppc/boot differed vastly between
>the PPC trees and kernel.org. But since they're synced up again now,
>it's time to tackle arch/ppc/boot :)
>
Let the fun begin :)
>>The arch/ppc/Makefile.in has a "link_subdirs(kernel mm math-emu)"
statement.
>>The build directory (arch/ppc) has the following directories: 8260_io,
>>kernel, mm, lib, math-emu.
>>How does the 8260_io and lib directory get built ?
>>
>I _think_ I test-built an 8260 kernel but I'm not sure.
>
Through a little guess work and a bit of trial and error, I figured out
that kbuild-2.5 requires a Makefile.in fragment in each directory. It
must search every directory for this file. I think the presence of this
file (with appropriate contents) causes the directory and file to be
built. I put a Makefile.in the arch/ppc/boot/mbx directory and things
started to happen (mostly bad things but I'm still playing).
>>How can I get the wrapper to build. kbuild-2.4 used the make zImage in
>>arch/ppc/mbxboot/Makfile for kernel-2.4.0. It is now arch/ppc/boot/mbx
>>for 2.4.18.
>>
>It's arch/ppc/boot/simple in 2.4.19-preX, and that's the 'correct'
>stuff.
>
I can't recall seing arch/ppc/boot/simple in my source tree (I'm at home
at the moment and will check when I get back to work tomorrow). I'm
currently using 2.4.18-pre8 kernel and should probably patch it to 2.4.18.
>>If I configured for pmac, how does the build system know to delve into
>>the arch/ppc/boot/pmac directory ?
>>
>Well, w/ kbuild-2.4 arch/ppc/boot/Makefile controls all of that with
>SUBDIR-$(...) statements.
>
Yep. But I was asking about how kbuild-2.5 figured out this stuff. I
think it is the Makefile.in fragments as mentioned above.
I think I have to use a combination of link_subdirs, base_target and
select funtions in the Makefile.in to build the wrapper but am not quite
sure which or how yet. I'm also playing around with extra_cflags_all
and extra_ldflags_all.
Thanks,
Brendan Simon.
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