* Dan Williams <dan.j.williams@xxxxxxxxx> wrote: > On Thu, Oct 20, 2016 at 8:22 AM, Dan Williams <dan.j.williams@xxxxxxxxx> wrote: > > On Thu, Oct 20, 2016 at 5:29 AM, Matt Fleming <matt@xxxxxxxxxxxxxxxxxxx> wrote: > >> On Wed, 19 Oct, at 09:04:29PM, Dan Williams wrote: > >>> Hi, > >>> > >>> I am currently unable to boot a Yoga 900 with latest mainline, but 4.8 boots. > >>> > >>> The symptom is a reboot before the video console is available. > >>> > >>> I bisected to commit 816e76129ed5 "efi: Allow drivers to reserve boot > >>> services forever". However, that commit is known to be broken. The > >>> proposed fix, commit 92dc33501bfb "x86/efi: Round EFI memmap > >>> reservations to EFI_PAGE_SIZE", also exhibits the reboot problem. > >>> > >>> During the bisect some of the stopping points landed on commits that > >>> caused the boot process to hang rather than cause a reboot. The > >>> commits that resulted in a hang are marked "git bisect skip" in this > >>> log: https://gist.github.com/djbw/1b501daa98192a42ae848f03bb59c30e > >>> > >>> I'll try treating those hangs as bad bisect results and re-run the > >>> full bisect tomorrow. In the meantime I wonder if the bisect log > >>> implicates a better regression candidate? > >> > >> Could you mail the dmesg output when booting a known working kernel > >> with efi=debug ? > > > > Here it is: > > > > https://gist.github.com/djbw/cae05e721b159d5ad7b146d7a93f5fa2 > > I am able to build a kernel and boot the platform with the following > set of reverts: > > Revert "x86/efi: Round EFI memmap reservations to EFI_PAGE_SIZE" > Revert "x86/efi-bgrt: Use efi_mem_reserve() to avoid copying image data" > Revert "efi/esrt: Use efi_mem_reserve() and avoid a kmalloc()" > Revert "efi: Allow drivers to reserve boot services forever" Could you please describe the bootup behavior after each revert? I.e. wild guess: vanilla kernel: # spontaneous reboot + Revert "x86/efi: Round EFI memmap reservations to EFI_PAGE_SIZE": # spontaneous reboot + Revert "x86/efi-bgrt: Use efi_mem_reserve() to avoid copying image data": # hang + Revert "efi/esrt: Use efi_mem_reserve() and avoid a kmalloc()": # hang + Revert "efi: Allow drivers to reserve boot services forever": == works ? Thanks, Ingo -- To unsubscribe from this list: send the line "unsubscribe linux-efi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
