Messages in this thread | | | Subject | Re: Regression in 5.1.0-rc2: PowerBook G4 Aluminum fails to boot - bisected to commit 0df977eafc792 | From | Larry Finger <> | Date | Mon, 25 Mar 2019 11:19:15 -0500 |
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On 3/25/19 3:46 AM, Christophe Leroy wrote: > > > 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. That patch fixes the issue.
Larry
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