Re: [PATCH 13/17] defaultenv: handle disk partitions

[Juergen Beisert <jbe@pengutronix.de>]

Sascha Hauer wrote:
> On Mon, Oct 11, 2010 at 02:26:12PM +0200, Juergen Beisert wrote:
> > Sascha Hauer wrote:
> > > Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
> > > ---
> > >  defaultenv/bin/init |    4 ++++
> > >  1 files changed, 4 insertions(+), 0 deletions(-)
> > >
> > > diff --git a/defaultenv/bin/init b/defaultenv/bin/init
> > > index a55e8e6..526e3db 100644
> > > --- a/defaultenv/bin/init
> > > +++ b/defaultenv/bin/init
> > > @@ -8,6 +8,10 @@ if [ -e /dev/nor0 ]; then
> > >  	addpart /dev/nor0 $nor_parts
> > >  fi
> > >
> > > +if [ -e /dev/disk0 ]; then
> > > +	addpart /dev/disk0 $disk_parts
> > > +fi
> > > +
> >
> > Are you sure you want/need additional partitions on a disk without a
> > persistant partition table?
>
> No ;)
>
> It is not completely clear to me how we handle this best. On i.MX51 I
> have some problems with the partition table. When booting from SD card
> we just dump barebox.bin to the raw card. The partition table is then
> part of barebox.bin. Unfortunately we do not know (or at least we don't
> want to specifiy) the size of the card during compile time.
>
> How should a bootable SD card should be partitioned anyway? We could add
> partitions for barebox/env/kernel/root like usual, but this does not
> look very standard for SD cards (and we even need extended partitions
> if we want to add a data partition). We could also add just a single
> partition for root and maintain the rest outside of any partition.

If you want your kernel to work with this card you will need a partition 
table. Its more like a hard disk, not like a flash memory of NAND or NOR 
type. So, IMHO you will need a full blown partition table when you want use 
the SD card outside barebox.

jbe

-- 
Pengutronix e.K.                              | Juergen Beisert             |
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