From mboxrd@z Thu Jan  1 00:00:00 1970
From: Marek Vasut <marex@denx.de>
Date: Sun, 13 Dec 2015 04:14:54 +0100
Subject: [U-Boot] [PATCH 1/6] arm: socfpga: cyclone5-socdk: Enabling mtd
	partitioning layout
In-Reply-To: <1449967746.2601.38.camel@altera.com>
References: <1449825353-2568-1-git-send-email-clsee@altera.com>
 <201512130101.17253.marex@denx.de> <1449967746.2601.38.camel@altera.com>
Message-ID: <201512130414.54214.marex@denx.de>
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To: u-boot@lists.denx.de

On Sunday, December 13, 2015 at 01:49:06 AM, Chin Liang See wrote:
> On Sun, 2015-12-13 at 01:01 +0100, Marek Vasut wrote:
> > On Sunday, December 13, 2015 at 12:59:48 AM, Chin Liang See wrote:
> > > On Sat, 2015-12-12 at 16:36 +0100, Marek Vasut wrote:
> > > > On Saturday, December 12, 2015 at 07:30:46 AM, Chin Liang See
> > > 
> > > > wrote:
> > > [...]
> > > 
> > > > > > Can you share the final layout before you roll out patches ?
> > > > > 
> > > > > Sure, plan to do so but need to away from desk just now.
> > > > > 
> > > > > Here is the old layout
> > > > > 256k(spl)
> > > > > 64k(env)
> > > > > 64k(dtb)
> > > > > 256k(boot)
> > > > > 16m(kernel)
> > > > > 16m(rootfs)
> > > > > 
> > > > > The new one would like this
> > > > > 256k(spl)
> > > > 
> > > > I'd say you should just call this u-boot, see above for the
> > > > rationale.
> > > > 
> > > > > 256k(env)
> > > > > 15872k(boot)
> > > > > 16m(rootfs)
> > > > > 
> > > > > The boot partition can be used as ubi part or raw partition.
> > > > > It contains the linux dtb, u-boot and linux images.
> > > > 
> > > > Is that an UBIFS partition ? If so, why don't you just use two
> > > > UBI
> > > > volumes ?
> > > 
> > > For backward compatibility, it can be raw if user want to stick
> > > with
> > > old way.
> > 
> > If you're breaking the partitioning layout anyway, you don't have to
> > care about the "old way", right ?
> 
> Actually this partition can be used as raw partition if user don't want
> to store zimage and dtb as raw binary.

You should never store raw zImage/dtb in a flash on a production system.
This is real bad and can result in a corruption in the future when the
system is in the field for a long time. I'd suggest to just use two UBI
volumes, one for fitImage and the other for rootfs.

> But the rootfs partition still can be presented to Linux as ubifs.

That's for sure :)

Best regards,
Marek Vasut