[U-Boot] [PATCH 1/6] arm: socfpga: cyclone5-socdk: Enabling mtd partitioning layout

[Marek Vasut]

On Saturday, December 12, 2015 at 12:59:02 AM, Chin Liang See wrote:
> On Fri, 2015-12-11 at 15:21 +0100, Marek Vasut wrote:
> > On Friday, December 11, 2015 at 10:15:48 AM, Chin Liang See wrote:
> > > Enabling mtd partitioning layout which indicate partition
> > > for various boot partition
> > > 
> > > Signed-off-by: Chin Liang See <clsee at altera.com>
> > > Cc: Dinh Nguyen <dinguyen at opensource.altera.com>
> > > Cc: Dinh Nguyen <dinh.linux at gmail.com>
> > > Cc: Pavel Machek <pavel at denx.de>
> > > Cc: Marek Vasut <marex at denx.de>
> > > Cc: Stefan Roese <sr at denx.de>
> > > ---
> > > 
> > >  include/configs/socfpga_cyclone5_socdk.h | 12 ++++++++++++
> > >  1 file changed, 12 insertions(+)
> > > 
> > > diff --git a/include/configs/socfpga_cyclone5_socdk.h
> > > b/include/configs/socfpga_cyclone5_socdk.h index 67bb35f..e4a1657
> > > 100644
> > > --- a/include/configs/socfpga_cyclone5_socdk.h
> > > +++ b/include/configs/socfpga_cyclone5_socdk.h
> > > @@ -96,4 +96,16 @@
> > > 
> > >  /* The rest of the configuration is shared */
> > >  #include <configs/socfpga_common.h>
> > > 
> > > +/* mtd partitioning for serial NOR flash */
> > > +#if defined(CONFIG_CMD_UBI) || defined(CONFIG_CMD_SF)
> > 
> > Is this the default Altera layout ?
> 
> Yah but believe it need to be updated

So you're not worried about compatibility I presume ?

> > > +#define MTDPARTS_DEFAULT	"mtdparts=ff705000.spi:"\
> > > +				"256k(spl),"		\
> > > +				"64k(env),"		\
> > > +				"64k(dtb),"		\
> > 
> > What happens if the DT grows over 64k ?
> 
> Hmmm rethinking of this, I will make Linux dtb, U-Boot and kernel as
> part of one big UBI partition called boot.

I am using this sort of layout on SoCkit internally:

        "mtdparts=ff705000.spi:"                \
                "1m(u-boot),"                   \
                "64k(env1),"                    \
                "64k(env2),"                    \
                "-(UBI)\0"

I have two environment blocks to implement redundant env, which is useful
when deploying the system. It makes the system slightly more resilient
against problems of aging flash.

> > > +				"256k(boot),"		\
> > 
> > 256k is not enough for U-Boot (considering this is U-Boot).
> 
> Will create boot region to avoid worrying the size issue
> 
> > > +				"16m(kernel),"		\
> > > +				"16m(rootfs),"		\
> > 
> > Why don't you put kernel and rootfs onto the UBI volume instead ?
> 
> Yup, kernel will go into boot partition. It will be separated from
> rootfs as user might choose nfs.

Can you share the final layout before you roll out patches ?