926172d46038d7610b6b8d84e40db727cefb482d ("efi: Export EFI runtime
memory mapping to sysfs") might fix it on the linux side.

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https://bugs.launchpad.net/bugs/1787596

Title:
  kexec can't give acpi_rsdp parameter to efi boot

Status in kexec-tools package in Ubuntu:
  New
Status in linux package in Ubuntu:
  Confirmed
Status in kexec-tools source package in Trusty:
  Confirmed
Status in linux source package in Trusty:
  Confirmed

Bug description:
  When doing kexec on trusty, it will look for the xloadflags on the
  bzImage, but won't find it on trusty kernels. That will break kexec on
  EFI systems, requiring acpi_rsdp parameter to be given manually.

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