On 09/21/2018 10:47 AM, Scott Wood wrote: > On Fri, 2018-09-21 at 17:40 +0000, York Sun wrote: >> On 09/20/2018 05:31 PM, Scott Wood wrote: >>> On Fri, 2018-09-21 at 00:48 +0200, David Lamparter wrote: >>>> This is a *partial* revert of "powerpc/85xx: Load all early TLB entries >>>> at once" (d9e1831a420267a7ced708bb259d65b0a3c0344d.) >>>> >>>> My dusty old P4080DS just completely fails to boot (no output at all) >>>> without this revert. I have no clue what's going on here, I just >>>> bisected it down and since it looks like an optimization to me I just >>>> reverted it - and voilá, the P4080 boots again. >>> >>> It's not an optimization; it was required to get kdump working, at least >>> for certain choices of crash kernel location. I just tried booting a 32- >>> bit kernel and did not see this problem -- but I don't have access to a >>> p4080ds anymore. I tried with qemu e500mc, and also running a 32-bit >>> kernel on e6500 (needs a tiny change to get past SMP init, since 32-bit >>> isn't really supported on e6500, but you do get output even without that). >>> >>> Do you have a JTAG that can be used to find out where it's hanging? If >>> not, I can try to get early debug working (needs an early IOMMU mapping). >>> >>> York, can you try booting the latest kernel on p4080ds? >>> >> >> Scott, >> >> I haven't tried P4080DS for a long time. What defconfig do you use for >> this board? I tried latest master branch (commit a27fb6d983c7b5) with >> corenet_basic_defconfig, it didn't boot up. Kernel has an exception very >> early (pc ffffae80). >> >> However, before I claimed the board, someone booted Linux 4.14.71 on >> this board. I need to track down where the image came from. > > Use corenet32_smp_defconfig > > corenet_basic_defconfig is just a fragment used by the makefiles in assembling > the final config. >
Thanks for the instruction. Linux comes up OK with corenet32_smp_defconfig. root@p4080ds:~# uname -a Linux p4080ds 4.19.0-rc4-00206-ga27fb6d #1 SMP Fri Sep 21 10:56:36 PDT 2018 ppc GNU/Linux York
