On 03/06/2013 08:53 AM, Josh Boyer wrote:
>
> I don't think this is limited to elilo. I have a UEFI machine booting
> with grub2 that also fails to boot because of this patch. I was in the
> middle of bisecting when I found this thread and if I revert 5dcd14ecd4
> the machine boots again. Put that commit back in and it doesn't. We've
> had three other reports in Fedora of similar cases.
>
> I discussed this with Peter Jones this morning. He was looking into what
> grub2 does for boot_params and it seems to be read-modify-write instead
> of clearing the whole thing. (CC'd Peter now.)
>
> The patch for elilo probably works, but if grub2 is hitting this then I'm
> curious if most bootloaders will. I'll finish my bisect just to be extra
> sure, but something probably needs to be done in a more generic fashion
> here.
>
Come to think about it...
The EFI field actually has a magic, unless just about all the rest of
them, so clearing it is probabilistically redundant; in other words we
almost certainly should exclude it from the clearing, unconditionally.
Does the "elilo" patch made unconditional work for you?
-hpa
--
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel. I don't speak on their behalf.
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