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SurfaceRT Hacking
  • SurfaceRT/RT2 Hacking Notes
  • Development
    • Cross Compiling
    • EFI Signing / Secure Boot
    • Interesting Repo's
    • UEFI
    • UEFI Boot Sequence
    • GRUB2::booting notes
      • Compiling grub2
    • Kernel
      • Kernel DTB's
    • QEMU
    • APX Mode (USB debug)
  • Reference
    • memory mapping
    • ACPI/DSDT Tables
    • Hardware I/O (J14)
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  1. Development

GRUB2::booting notes

PreviousUEFI Boot SequenceNextCompiling grub2

Last updated 4 years ago

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Starting from Linux Kernel 5.0, it is now possible to enable FrameBuffer. earlycon=efifb,mem grub_cfg set grub_mm_debug=1 insmod efi_gop insmod efi_uga More here - https://forum.xda-developers.com/windows-8-rt/rt-development/wip-secure-boot-linux-surface-rt-t3653848/page13

EFISTUB

Booting for EFISTUB kernel currently fails. ERROR: Unable to allocate memory for uncompressed kernel My thoughts are its not loading in the right memory area. ?TBD - We can try hard code the kernel extraction area. Other possibilities are that its not liking the signing? although it should error out correctly if so.