On Tue, 9 Aug 2016, Benjamin Herrenschmidt wrote: > On Tue, 2016-08-09 at 02:06 -0700, Christian Kujau wrote: > > On Mon, 8 Aug 2016, Christian Kujau wrote: > > > > > > while trying to upgrade this PowerBook G4 from 4.7-rc7 to 4.8-rc1, > > > it's > > > unable to boot the Yaboot (v1.3.16 from Debian/stable) boot loader: > > There should already be a fix for that: > http://patchwork.ozlabs.org/patch/654560/
2c0f99516f539 ("powerpc/32: Fix early access to cpu_spec relocation") is in mainline, but my machine is still unable to boot, same error, different address: > Invalid memory access at $SRR0: 0121686c $SRR1: 00003030 Happy to test more patches :-) Christian. > It should be in Michael's tree if not already in Linus. > > Cheers, > Ben. > > > > ================================================================ > > > copying OF device tree... > > > Building dt strings... > > > Building dt stucture... > > > Device tree strings 0x01e72000 -> 0x01e73615 > > > Device tree struct 0x01e74000 -> 0x01e7e000 > > > Quiescing Open Firmware... > > > Bootng Linux via __start()... > > > > > > Invalid memory access at $SRR0: 0140f86c $SRR1: 00003030 > > > > > > Apple PowerBook6,8 4.9.0f0 BootROM built on 01/10/05 at 10:39:14 > > > [...] > > > > > > ok > > > 0:> _ > > > ================================================================ > > > > > > Going back to 4.7-rc7 (w/o installing Yaboot again) works just > > > fine. The > > > config is mostly the same (used "make oldconfig" from 4.7), but > > > I've said > > > YES to CONFIG_SLAB_FREELIST_RANDOM - could this be causing the > > > boot > > > failure? Full .config and screen shot: http://nerdbynature.de/bits/ > > > 4.8.0-rc1/ > > > > A git-bisect led me to: > > > > ========================================= > > commit 9402c684613163888714df0955fa1f17142b08bf > > Author: Benjamin Herrenschmidt <b...@kernel.crashing.org> > > Date: Tue Jul 5 15:03:41 2016 +1000 > > > > powerpc: Factor do_feature_fixup calls > > > > 32 and 64-bit do a similar set of calls early on, we move it all > > to > > a single common function to make the boot code more readable. > > > > Signed-off-by: Benjamin Herrenschmidt <b...@kernel.crashing.org> > > Signed-off-by: Michael Ellerman <m...@ellerman.id.au> > > ========================================= > > > > But I'm unable to revert just this patch: > > > > $ git revert 9402c684613163888714df0955fa1f17142b08bf > > error: could not revert 9402c68... powerpc: Factor do_feature_fixup > > calls > > hint: after resolving the conflicts, mark the corrected paths > > > > The bisect-log: > > > > ========================================= > > $ git bisect log > > git bisect start '--' 'arch/powerpc' > > # good: [523d939ef98fd712632d93a5a2b588e477a7565e] Linux 4.7 > > git bisect good 523d939ef98fd712632d93a5a2b588e477a7565e > > # bad: [29b4817d4018df78086157ea3a55c1d9424a7cfc] Linux 4.8-rc1 > > git bisect bad 29b4817d4018df78086157ea3a55c1d9424a7cfc > > # bad: [3808a88985b4f5f5e947c364debce4441a380fb8] powerpc: Move FW > > feature probing out of pseries probe() > > git bisect bad 3808a88985b4f5f5e947c364debce4441a380fb8 > > # good: [a203658b5ed37c11e5016d3fbbbab9ce018c1b78] powerpc/opal: Wake > > up kopald polling thread before waiting for events > > git bisect good a203658b5ed37c11e5016d3fbbbab9ce018c1b78 > > # good: [0dfffb48cecd8f84c6e649baee9bacd9be925734] powerpc/powernv: > > abstraction for saving SPRs before entering deep idle states > > git bisect good 0dfffb48cecd8f84c6e649baee9bacd9be925734 > > # good: [66c570f545e056babdd9510595ce762dcedadd71] powerpc/mm: use > > _raw variant of page table accessors > > git bisect good 66c570f545e056babdd9510595ce762dcedadd71 > > # good: [c2ca9f6b4cc4c45eb598b24b8b06beee668052d5] powerpc/powernv: > > Fix pci-cxl.c build when CONFIG_MODULES=n > > git bisect good c2ca9f6b4cc4c45eb598b24b8b06beee668052d5 > > # good: [4c91bd6eeabb004f283db8a6854b134e2a2de1bc] powerpc: Merge the > > RELOCATABLE config entries for ppc32 and ppc64 > > git bisect good 4c91bd6eeabb004f283db8a6854b134e2a2de1bc > > # bad: [c4bd6cb87c9e28a7d9f4a97db5a06cc538eb5e48] powerpc: Move 64- > > bit feature fixup earlier > > git bisect bad c4bd6cb87c9e28a7d9f4a97db5a06cc538eb5e48 > > # bad: [9402c684613163888714df0955fa1f17142b08bf] powerpc: Factor > > do_feature_fixup calls > > git bisect bad 9402c684613163888714df0955fa1f17142b08bf > > # good: [27d1149667352772240655b65372a4294f992ea7] powerpc/32: Remove > > RELOCATABLE_PPC32 > > git bisect good 27d1149667352772240655b65372a4294f992ea7 > > # first bad commit: [9402c684613163888714df0955fa1f17142b08bf] > > powerpc: Factor do_feature_fixup calls > > ========================================= > > > > > > HTH, > > Christian. > -- BOFH excuse #62: need to wrap system in aluminum foil to fix problem