Re: How to deal with fatal device seeks?

[Andrey Borzenkov <arvidjaar@gmail.com>]

В Sun, 16 Mar 2014 17:05:53 +0100
adrian15 <adrian15sgd@gmail.com> пишет:

> 
> I'm getting the same problem
> ( FATAL: int13_cdrom: function 42. Can't use 64bits lba )
> 

This message does not exist in grub sources, so it likely comes from
firmware. 64 bit LBA would mean size over 2TB. So the first question -
what size of disks do you have?

> with hd0, hd1, hd2, hd3, and worse:
> 
> * hd2,msdos5
> 
> ls (hd2,msdos5)/
> 
> Is this a bug?
> 

Hard to tell. Do you actually have working filesystem(s) on these
partitions? The message itself simply means that grub attempts to read
very high offset. I wonder if it can be somehow byte order related.

> adrian15
> 
> El 16/03/14 06:26, adrian15 escribió:
> >    I use a for loop for detecting Operating systems like this one:
> >
> > for dev in (*); do
> >
> >    echo $dev
> >
> > done
> >
> > but it hangs !!!
> >
> > So some clues:
> >
> > * Using 2.02~beta2-7 from Debian Unstable.
> > * The disk is an hybrid one (x86_64_efi + i386_pc).
> > * The error only happens when using Virtualbox in a non-EFI setup.
> >
> > So some questions:
> >
> > * Is it a bug that a non seekable device like (cd,apple4) or (cd,gpt1)
> > is available in non-EFI mode?
> > * Is it perhaps a Virtualbox bug?
> > * I cannot catch these fatal error as if they were exceptions inside a
> > try-catch. Or can I?
> >
> > I will probably improve my searchindevices functions so that it also
> > filters these (cdsomething) devices as a workaround.
> >
> > Thank you.
> >
> >
> > These are the minimal tests:
> >
> > --- Using Qemu as EFI gives no problem:
> >
> > echo (*)
> > (fd0) ... (cd) ... (cd,apple2),... (cd,gpt2)
> > ls (cd,apple4)/
> > error: unknown filesystem.
> > ls (cd,gpt1)/
> > error: unknown filesystem.
> >
> > --- Using Virtualbox as BIOS (Ex. 1) (Problem):
> >
> > echo (*)
> > (fd0) ... (cd) ... (cd,apple2),... (cd,gpt2)
> > ls (cd,apple4)/
> > FATAL: int13_cdrom: function 42. Can't use 64bits lba
> >
> > --- Using Virtualbox as BIOS (Ex. 2) (No problem):
> >
> > echo (*)
> > (fd0) ... (cd) ... (cd,apple2),... (cd,gpt2)
> > ls (cd,gpt4)/
> > error: unknown filesystem.
> >
> > --- Using Virtualbox as BIOS (Ex. 3) (Problem):
> >
> > echo (*)
> > (fd0) ... (cd) ... (cd,apple2),... (cd,gpt2)
> > ls (cd,gpt1)/
> > FATAL: int13_cdrom: function 42. Can't use 64bits lba
> >
> >
> > adrian15
>