Hardknott: grub immediately reboots

Hardknott: grub immediately reboots

[tonyb]

After upgrading from Dunfell (YP 3.1) to Hardknott (YP 3.3), our
firmware was unable to boot.  Our target hardware is x86-64 booting in
legacy BIOS mode using grub on a variety of motherboards and CPUs.  The
grub menu would never show up; instead it would reboot immediately,
leading to an endless reboot loop.

I have two different workarounds.  Create a bbappend file for grub, and
do one of the following two things:

1) Add the following line:

CFLAGS_remove = "-O2"

2) Or make a patch to revert the following commit, and add it to SRC_URI:

https://git.savannah.gnu.org/cgit/grub.git/commit/?id=4ea7bae51f97e49c84dc67ea30b466ca8633b9f6


NOTE: this commit fixes a CVE, so do not revert it without due
consideration.


Here is my upstream bug report:

https://savannah.gnu.org/bugs/index.php?60458


Is anyone else experiencing this problem?  I am wondering how it got
past Yocto QA.

Tony Battersby
Cybernetics

Re: [yocto] Hardknott: grub immediately reboots

[Anuj Mittal]

> -----Original Message-----
> From: yocto@lists.yoctoproject.org <yocto@lists.yoctoproject.org> On Behalf Of
> Tony Battersby
> Sent: Tuesday, April 27, 2021 03:07 AM
> To: yocto@lists.yoctoproject.org
> Subject: [yocto] Hardknott: grub immediately reboots
> 
> After upgrading from Dunfell (YP 3.1) to Hardknott (YP 3.3), our firmware was
> unable to boot.  Our target hardware is x86-64 booting in legacy BIOS mode using
> grub on a variety of motherboards and CPUs.  The grub menu would never show up;
> instead it would reboot immediately, leading to an endless reboot loop.
> 
> I have two different workarounds.  Create a bbappend file for grub, and do one of the
> following two things:
> 
> 1) Add the following line:
> 
> CFLAGS_remove = "-O2"

I think we should probably remove this. That's what Fedora also seems to be doing so Os is used.

https://src.fedoraproject.org/rpms/grub2/blob/rawhide/f/grub.macros#_19

and what grub configure expects:

https://git.savannah.gnu.org/cgit/grub.git/tree/configure.ac#n41

Thanks,

Anuj

Re: [yocto] Hardknott: grub immediately reboots

[Tony Battersby]

On 4/28/21 11:25 PM, Mittal, Anuj wrote:
>
>> -----Original Message-----
>> From: yocto@lists.yoctoproject.org <yocto@lists.yoctoproject.org> On Behalf Of
>> Tony Battersby
>> Sent: Tuesday, April 27, 2021 03:07 AM
>> To: yocto@lists.yoctoproject.org
>> Subject: [yocto] Hardknott: grub immediately reboots
>>
>> After upgrading from Dunfell (YP 3.1) to Hardknott (YP 3.3), our firmware was
>> unable to boot.  Our target hardware is x86-64 booting in legacy BIOS mode using
>> grub on a variety of motherboards and CPUs.  The grub menu would never show up;
>> instead it would reboot immediately, leading to an endless reboot loop.
>>
>> I have two different workarounds.  Create a bbappend file for grub, and do one of the
>> following two things:
>>
>> 1) Add the following line:
>>
>> CFLAGS_remove = "-O2"
> I think we should probably remove this. That's what Fedora also seems to be doing so Os is used.
>
> https://src.fedoraproject.org/rpms/grub2/blob/rawhide/f/grub.macros#_19
>
> and what grub configure expects:
>
> https://git.savannah.gnu.org/cgit/grub.git/tree/configure.ac#n41
>
> Thanks,
>
> Anuj

I have opened a Yocto bug here:

https://bugzilla.yoctoproject.org/show_bug.cgi?id=14367

Tony