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. York
