[U-Boot] [PATCH v1] arm: socfpga: Enable load zImage and Linux DTB from QSPI

[Marek Vasut]

On Friday, November 27, 2015 at 01:16:19 PM, Chin Liang See wrote:
> On Fri, 2015-11-27 at 13:11 +0100, Marek Vasut wrote:
> > On Friday, November 27, 2015 at 01:07:23 PM, Chin Liang See wrote:
> > > On Fri, 2015-11-27 at 11:20 +0100, Marek Vasut wrote:
> > > > On Friday, November 27, 2015 at 02:34:27 AM, Chin Liang See
> > > > 
> > > > wrote:
> > > > > Hi Marek,
> > > > > 
> > > > > On Fri, 2015-11-27 at 02:27 +0100, Marek Vasut wrote:
> > > > > > On Friday, November 27, 2015 at 02:24:49 AM, Chin Liang See
> > > > > > 
> > > > > > wrote:
> > > > > > > Hi Pavel,
> > > > > > > 
> > > > > > > On Thu, 2015-11-26 at 15:43 +0100, Pavel Machek wrote:
> > > > > > > > Hi!
> > > > > > > > 
> > > > > > > > > Adding new environment qspiload which will load zImage
> > > > > > > > > and
> > > > > > > > > Linux DTB from serial NOR flash. The default flash
> > > > > > > > > offset
> > > > > > > > > for
> > > > > > > > > the images as below and they are configurable during
> > > > > > > > > run
> > > > > > > > > time.
> > > > > > > > > 
> > > > > > > > > - zImage located at    0xa0000 with assuming file size
> > > > > > > > > 6MB
> > > > > > > > > - Linux DTB located at 0x50000 with assuming file size
> > > > > > > > > 28kB
> > > > > > > > 
> > > > > > > > Hmm. Ok, zImage second, so that it can grow. Makes sense.
> > > > > > > > Not
> > > > > > > > sure if
> > > > > > > > 28kB is not a bit small for DTB. I'd reserve at least
> > > > > > > > 64kB.
> > > > > > > 
> > > > > > > Yup, it can grow up to 64kB as the size for a sector. We
> > > > > > > used
> > > > > > > 28KB
> > > > > > > mainly for boot time performance.
> > > > > > 
> > > > > > So why don't you use UBI on the QSPI NOR ? That way, you'd
> > > > > > secure
> > > > > > the
> > > > > > binaries against bitrot as well.
> > > > > 
> > > > > Good point. Its a nice enhancement as we were using raw access
> > > > > for
> > > > > the
> > > > > images in NAND and QSPI. Will add a new command for fs support
> > > > > once
> > > > > we
> > > > > enable the ubifs support in socfpga
> > > > 
> > > > Why can't this be enabled now then ?
> > > 
> > > Mainly for backward compatibility as customer might have their own
> > > script on programming a blank flash in production. This is the same
> > > where we can do mmc load or a load (with file system).
> > 
> > Does that imply that we will have to get stuck in the past because
> > some
> > random customer of some random company might have a random script
> > somewhere? :)
> 
> Haha nope, we still need to advance. Just that we are giving choice for
> classic and new :)

Can you check if we can do both then? With the option to prefer the new one?

Check the attached patch, it should give you an idea how to load files from
UBI/UBIFS on QSPI. It even enables mtdparts for the QSPI, which is cool too.
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