On Tue, 14 Apr 2020 at 12:40, Jörg Otte <jrg.otte@xxxxxxxxx> wrote: > > Booting my notebook with kernel V57-rc1 I get following > display: > > exit_boot() failed! > efi_main() failed! > StartImage failed: Buffer Too Small > > Booting Kernel V5.6 works well. > > From dmesg (kernel V5.6): > efi: EFI v2.31 by Phoenix Technologies Ltd. > efi: ACPI=0xdcffe000 ACPI 2.0=0xdcffe014 SMBIOS=0xdce80000 RNG=0xdc3cd198 > efi: seeding entropy pool > efi: [Firmware Bug]: Invalid EFI memory map entries: > efi: mem47: [Reserved | | | | | | | | | | | | > | ] range=[0x0000000000000000-0x0000000000000000] (invalid) > efi: mem48: [Reserved | | | | | | | | | | | | > | ] range=[0x0000000000000000-0x0000000000000000] (invalid) > efi: mem49: [Reserved | | | | | | | | | | | | > | ] range=[0x0000000000000000-0x0000000000000000] (invalid) > efi: mem50: [Reserved | | | | | | | | | | | | > | ] range=[0x0000000000000000-0x0000000000000000] (invalid) > efi: mem51: [Reserved | | | | | | | | | | | | > | ] range=[0x0000000000000000-0x0000000000000000] (invalid) > efi: Removing 5 invalid memory map entries. > Thanks for the report. Can you try booting with efi=no_disable_early_pci_dma passed via the kernel command line? [*] If that does not help, can you try to reproduce with this branch? https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git/log/?h=efi/urgent If it still does not work, please share your exact kernel config, and the version of your distro, GRUB, shim, systemd-boot, etc [*] GRUB on x86 turns out not to zero initialize BSS when it invokes the EFI stub as a PE/COFF executable, resulting in the 'disable early PCI DMA' feature to get enabled spuriously, which breaks the boot on buggy firmware. systemd-boot is even worse, as it ignores the PE/COFF metadata entirely in some cases, and just assumes it can invoke the PE/COFF entrypoint after copying the kernel image into memory.
