Re: EFI booting from external USB pen drive

> On 2018-07-06 04:17, Warner Losh wrote:
> > On Thu, Jul 5, 2018 at 7:11 PM, Rodney W. Grimes <
> > freebsd-rwg_at_pdx.rh.cn85.dnsmgr.net> wrote:
> > 
> >> > On 5 Jul 2018, at 18:18, Rodney W. Grimes wrote:
> >> >
> >> > > [ Charset UTF-8 unsupported, converting... ]
> >> > >> On 5 Jul 2018, at 17:19, Warner Losh wrote:
> >> > >>
> >> > >>> FAT12 isn't good for UEFI. Use FAT16 or FAT32.
> >> > >>
> >> > >> We use it for the default image we built and the wiki suggests it as
> >> > >> well at https://wiki.freebsd.org/UEFI#CD.2FDVD_Boot_under_UEFI
> >> > >
> >> > > IIRC FreeBSD recently cnahged to FAT16 or 32 on these
> >> > > as the size got pushed up to be larger than what FAT12
> >> > > can access.
> >> >
> >> > https://svnweb.freebsd.org/base/head/stand/efi/boot1/
> >> generate-fat.sh?annotate=332561#l45
> >> >
> >> > nope.
> >> 
> >> That is not the code we build release images with,
> >> that is Warners tests for the boot loader.
> >> 
> > 
> > No, that's the actual code that generates boot1.efiffat.
> > 
> > Warner
> 
>   Yup, and EFI have no problem at all with this.
>   FAT12 can work with all EFI implementation, the problem is the size of 
> the FAT12 part that sometimes causes problems.
>   Rod, you are refering to the arm images which do not uses makefs or 
> generate-fat.sh but using md device and newfs_msdos.

Yes, your right Emmanuel, thanks.  I thought that was the last
place fat12 was in use, but I see there is this ugly bit of evil
still around.

-- 
Rod Grimes                                                 rgrimes_at_freebsd.org