Hacks to allow booting ARM SMP kernel on UP ARMv7
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Cover letter [PATCH 0/4] Hacks to allow booting ARM SMP kernel on UP ARMv7
Hi Tony,
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Hi all,
Here are some experimental patches to allow booting ARMv7 SMP kernel on UP to some extent. Posting these early in case it is of any help as I know at least Bryan Wu is working on similar issues.
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The patches are very much work in progress, and does not quite boot to init yet so there's all kinds of things to fix. But at least these patches allow booting to the point where the fixing issues might be a bit easier.. Currently it boots to the point where there are tons of "WARNING: at
mm/percpu-vm.c:320pcpu_alloc" prints.
I've got some similar hacks for the RealView boards which I've used to build a Kernel that can boot on the PB-A8 and PBX-A9. Whilst this is the wrong way of going about solving the problem [Russell's code patching is a lot neater and more scaleable] you might be interested in looking at the code anyway:
http://www.linux-arm.org/git?p=linux-2.6-wd.git;a=shortlog;h=refs/heads/smp-up-hacks
Only v7 cores are supported and TEX remapping is used to avoid having to worry about setting the shared attribute at runtime. Yuck!
Will