On Thu, 10 Jul 2008 22:46:49 -0500
Stephen Horton [EMAIL PROTECTED] wrote:
Hello folks,
In a current work project, I have inherited a compactPCI board that
has
an mpc7447/7448 powerpc processor as well as a Marvell system
controller, model mv64462 (stripped down mv64460). The board has a
somewhat working Gentoo Linux port running on it from long ago and a
company far far away (kernel version 2.6.9 built using arch/ppc). To
prepare for an upcoming deployment, I would like to bring the OS
up-to-date on this board with a newer kernel (targeting Gentoo 2008),
but I am unsure of the approach to take. I am a software developer,
but
normally do not work on kernel porting / board integration. I have
researched the arch/ppc to arch/powerpc migration, but I'm a bit
intimidated by the 'new' device tree symantics and other changes to
the
stream. Here are some questions:
1.Is it possible with the 2.6.24 (Gentoo 2008) kernel to still use
arch/ppc for this platform architecture? I've tried to get this to
compile, but am having trouble with files from arch/powerpc getting
pulled in; then I read some comments (from I believe this forum) that
indicated that arch/ppc is not longer supposed to compile
I've had problems getting newer versions of the kernel compiling (using
the ppc arch) for some of our boards. It's going completely in the next
release cycle I believe, infact the powerpc git tree[1] no longer has a
ppc arch. Hence we are moving to powerpc.
2.Does anyone have example code for this platform architecture?
Any freebees I could use for creating my device tree?
These patches may provide a reasonable starting point:
http://www.mail-archive.com/[EMAIL PROTECTED]/msg18084.html
3.Any advice of any kind?
Stick at it? - I've not long started kernel development and only had ppc
examples (for our boards), like you on an old kernel version (2.6.9 and
2.6.12) and what was in the kernel source. It's taken a while getting
familiar with the powerpc arch, but I'm beginning to see the benefits.
I'd suggest looking at the powerpc specific git tree. I use stacked
git[2] on top of this git tree and have found this a reasonably
productive way to work. Whilst learning and porting I can keep the base
up to date with stg pull (which peels off my changes, updates the git
tree and re-applies my changes). It also helps with creating well
formatted emails for submitting patches.
Hope this helps,
Martyn
[1] git://git.kernel.org/pub/scm/linux/kernel/git/paulus/powerpc.git
[2] http://procode.org/stgit/
Martyn Welch MEng MPhil MIET
Principal Software Engineer
GE Fanuc Intelligent Platforms
Tove Valley Business Park, Towcester,
Northants, NN12 6PF, United Kingdom
Telephone: +44 (0) 1327 359444
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