[Date Prev][Date Next] [Thread Prev][Thread Next] [Date Index] [Thread Index]

Re: Simultaneous EFI and Legacy bootloader installation

On 03/30/2016 09:53 AM, Lennart Sorensen wrote:
> On Wed, Mar 30, 2016 at 09:26:11AM -0500, Mario Limonciello wrote:
>> As Jared was mentioning to me the other day, there is unfortunately a
>> mentality in the server world of not installing the OS in UEFI yet and
>> leave the CSM enabled.  The best way to allow for that mentality to
>> break is to allow an easy way for an admin to switch to UEFI mode
>> without re-installation.
> Or perhaps you could have a dialog box telling the user:
> You booted in legacy mode.  It is recommended to boot in UEFI mode if
> posible to gain some benefits:
> - list of benefits
> That seems like a lot less trouble.
I think this is a great first step out of this thread.  The challenge I
see with this is how you identify a machine that happens to be running a
BIOS that actually supports running in a UEFI mode.

If the system supports SMBIOS 2.3 or later, then the BIOS
characteristics extension byte 2 bit 3 should indicate that UEFI is

Where in the installer would this dialog land?  Somewhere early on in
d-i I'd think after you picked your language but before you've gotten to
>> Yes, this will only help people wiling to reformat their disk.  I think
>> if Debian can lead the way in switching to GPT by default it can be a
>> role model for other distributions to make this change as well. 
> Again, if you want to lead that, then tell people to switch their system
> to UEFI before installing.  Don't do it by making a hack job install
> that can cause lots of problems later.
>> To me this is an acceptable compromise. 
>> IIRC there is a debconf question about installing to the removable path
>> when you install EFI GRUB2.  What are the defaults for this? 
>> Would you consider making the default yes if you identify they are
>> running in legacy mode when you install the EFI GRUB2 (to do this
>> bootloader switch).
> That could be a useful feature.
> A simple tool to change a disk from MBR to GPT without changing the
> placement of partitions could also be handy.  That could REALLY help
> people to move to GPT.  You would have to find a way to make room for
> the ESP or BIOS Boot Partition though.
I'm assuming simple is a relative term.  You would have to be able to
resize a filesystem in order to make another partition for the ESP. 
Then you also could run into a situation of a system that wouldn't like
an ESP that it finds later in the disk.  I don't know how common this
problem is.

Reply to: