Re: [Xen-devel] [PATCH RFC] efi: By default use the BOOT_ACPI method instead of BOOT_EFI unless on reduced ACPI hardware.

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 21.01.15 at 22:53, <konrad.wilk@xxxxxxxxxx> wrote:
> This mimics the behavior of the Linux kernel in which the reboot
> sequence by default under EFI booted kernels is first ACPI.

Which is contrary to the EFI spec. I.e. NAK.

> EFI reboot is only tried if the user supplied it or if the hardware
> is an ACPI 5.0 (or higher) reduced hardware board.
> 
> This fixes the EFI firmware crashing on Lenovo ThinkCentre M57

Buggy firmware should be worked around with "reboot="; I'd
certainly accept a patch to bypass efi_reset_system() in that
case.

Jan


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