[mdlug] UEFI Booting

[Bob]

I'm booting from and MBR SSD Drive and have two 4tb drives with GPT
partitions created with gparted. I'm not sure if I installed this system
with EFI or not, that was over 3 years ago.

Not sure you need EFI turned on in the bios or in the kernel to
read/write GPT partitions. UEFI is for booting.

Bob 

On 11/03/2014 08:55 PM, A. Zimmer wrote:
> Most of my machines support UEFI booting but I have disabled this option
> in the BIOS in preference to the "old school" MBR boot method.  However,
> now I would like to begin to move toward using UEFI booting with Linux. 
>
> Since UEFI requires the newer GPT disk format, as a first step toward
> this goal I compiled a Linux kernel with the capability to utilize the
> GPT disk format.  (This is accomplished simply by setting
> CONFIG_EFI_PARTITION=y during kernel configuration.)  My assumption was
> that by adding this capability the kernel would be able to read/write
> both GPT and MBR disks and thus I could experiment with GPT disks while
> still keeping my system on MBR hard drives.  This did not work.  After
> compiling the new kernel it failed to boot because the MBR system disks
> were inaccessible. 
>
> Is this the correct behavior when setting CONFIG_EFI_PARTITION=y?
>
> Is there any way to compile a Linux kernel to have access to both GPT
> and MBR disks simultaneously?  Or is such a setup impossible? 
>
> If it can't be done then the only solution would be to copy my current
> system over to a GPT formatted disk and find a way to boot from the GPT
> disk. 
>
> Can GNU parted or other tools create GPT partitions using a kernel that
> is not configure to access the GPT format? 
>
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