Messages in this thread | | | Subject | Re: Regression in 5.1.0-rc2: PowerBook G4 Aluminum fails to boot - bisected to commit 0df977eafc792 | From | Christophe Leroy <> | Date | Mon, 25 Mar 2019 09:46:39 +0100 |
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Le 25/03/2019 à 01:49, Larry Finger a écrit : > A build of kernel 5.1.0-rc2 resulted in a failure to boot on my > PowerBook G4 Aluminum. The bootstrap loads the initial kernel and issues > the appropriate start, but the machine hangs at that point. > > The problem does not depend on the choice of PPC32 processor type. This > machine has a 7447A according to /proc/cpuinfo. > > The problem was bisected to the following: > > commit 0df977eafc792a5365a7f81d8d5920132e03afad > Author: Christophe Leroy <christophe.leroy@c-s.fr> > Date: Thu Feb 21 10:37:54 2019 +0000 > > powerpc/6xx: Don't use SPRN_SPRG2 for storing stack pointer while > in RTAS > > When calling RTAS, the stack pointer is stored in SPRN_SPRG2 > in order to be able to restore it in case of machine check in RTAS. > > As machine check is not a perfomance critical path, this patch > frees SPRN_SPRG2 by using a field in thread struct instead. > > Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> > Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> > > I reverted this patch and found that the system began execution, and > then failed, likely due to the reassignment of SPRN_SPRG2. > > I had found this problem with 5.1.0-rc1, but -rc2 was out by the time I > finished the bisection. Unfortunately, none of the changes in -rc2 fixed > the problem.
I think I identified the issue, see https://patchwork.ozlabs.org/patch/1063962/
It is now booting properly under QEMU with your .config
Could you please test it on your target ?
Thanks Christophe
> > Attached is the .config that I used. > > Thanks, > > Larry
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