RE: Dell BIOS issue reading Disk Extended data

[K, Narendra]

Internal Use - Confidential

> -----Original Message-----
> From: Guilherme Piccoli <gpiccoli@canonical.com>
> Sent: Friday, March 12, 2021 9:14 PM
> To: Limonciello, Mario; K, Narendra
> Cc: Barabash, Alexander; Engel, Amit; Guilherme G. Piccoli;
> halves@canonical.com; Jay Vosburgh; Dan Streetman; Gavin Guo;
> x86@kernel.org; grub-devel@gnu.org
> Subject: Re: Dell BIOS issue reading Disk Extended data
> 
> 
> [EXTERNAL EMAIL]
> 
> On Fri, Jan 22, 2021 at 3:41 PM Limonciello, Mario
> <Mario.Limonciello@dell.com> wrote:
> >
> > >
> > > Hello Dell folks, I'm Guilherme Piccoli from Canonical - first of
> > > all, apologies for the out-of-nowhere communication. We've been
> > > investigating an issue that seems to date long time ago, and
> > > eventually we could narrow it to what appears to be a Dell BIOS bug.
> > > Notice I'm also looping a kernel x86 ML and grub-devel, just for the
> > > purpose of archiving such discussion in public lists, to help others
> > > that may find such an issue in the future.
> > >
> > > Since I don't have contacts of Dell representatives, I've just
> > > raised a list of people from Dell contributing to kernel in the last
> > > 2 years - maybe one of you could point me towards the path of a
> > > proper contact/channel to discuss such an issue. If not, I'm sorry for the
> noise.
> > > Let me detail the problem we're observing - notice all of this is
> > > about legacy BIOS mode, not UEFI.
> >
> > Most of the guys you CC'ed from Dell work on client related things,
> > not servers.  So I'll move some of the client guys off of this thread into 
> > BCC.
> > @K, Narendra can you please raise this with the appropriate team?
> >
> 
> Thanks Mario and K, Narendra - do we have any news about that?
> Cheers,

Hi Guilherme,

Sorry for the delay in responding.  

I checked with the team about the findings shared in this thread. Please find 
the details -

The behavior seems to be working as designed. Legacy BIOS Option ROM implements 
logical block addressing support only up to 2TB. 
The option ROM will respond with 2TB as the size when queried by INT13h 
function 48h. For booting from volumes > 2TB, UEFI is needed.

With regards,
Narendra K