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Subject: Re: nand  partitioning and fdt/dts?
From: Ian Lepore <freebsd@damnhippie.dyndns.org>
To: Ronald Klop <ronald@klop.ws>
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Date: Sun, 30 Dec 2012 20:19:15 -0700
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On Sun, 2012-12-30 at 23:00 +0100, Ronald Klop wrote:
> Hi,
> 
> I configured my SheevaPlug like this:
> http://wiki.freebsd.org/NAND#Static_NAND_partitioning
> 
> Now I'm running with this little local patch.
> Index: sys/boot/fdt/dts/sheevaplug.dts
> ===================================================================
> --- sys/boot/fdt/dts/sheevaplug.dts     (revision 244271)
> +++ sys/boot/fdt/dts/sheevaplug.dts     (working copy)
> @@ -95,7 +95,12 @@
>                          };
> 
>                          slice@200000 {
> -                               reg = <0x200000 0x1fe00000>;
> +                               reg = <0x200000 0x600000>;
> +                               label = "fbsd-boot";
> +                       };
> +
> +                       slice@800000 {
> +                               reg = <0x800000 0x1f800000>;
>                                  label = "root";
>                          };
>                  };
> 
> Not a problem, but I wonder why the config in wiki is different to the  
> config in svn.
> Can somebody explain this?
> Is there a better way to load the kernel than the fbsd-boot slice in nand?  
> I could imagine a bootloader loading the kernel from the 'root' slice, but  
> can't find any information how to configure that (if it already exists).
> 
> Regards,
> Ronald.

In theory you should be able to use /boot/ubldr as the thing that lives
in the fbsd-boot partition, and it knows how to find /boot/kernel on the
root filesystem.  I have to say "in theory" because I can't test it on
my DreamPlugs.  I've lost the original u-boot on both of them and have a
different one that I found on the web installed.  Sadly, it doesn't have
the "bootelf" command built in, so I can load ubldr but not launch it.

Oh wait, I just realized:  ubldr probably doesn't know about nandfs.

-- Ian