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

[Chin Liang See <clsee@altera.com>]

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).

Thanks
Chin Liang

> 
> Best regards,
> Marek Vasut