[U-Boot] [RFC PATCH 4/4 v3] mtd: sf: Add CONFIG_SPI_N25Q256A_RESET for software-reset

[Marek Vasut <marex@denx.de>]

On Saturday, April 25, 2015 at 09:48:31 PM, Pavel Machek wrote:
> On Thu 2014-10-02 00:34:48, Jagan Teki wrote:
> > On 2 October 2014 00:27, Stefan Roese <sr@denx.de> wrote:
> > > On 01.10.2014 20:25, Marek Vasut wrote:
> > >> On Wednesday, October 01, 2014 at 05:13:11 PM, Stefan Roese wrote:
> > >>> This is needed for the SoCFPGA booting from SPI NOR flash
> > >>> e.g. (N25Q256A). With these changes, the SoCrates can boot and
> > >>> re-boot (reset) from SPI NOR flash without any problems.
> > >> 
> > >> Seems like your SPI NOR reset logic is buggy. Does any of [1] apply to
> > >> your
> > >> board please?
> > >> 
> > >> [1] http://www.rocketboards.org/foswiki/Documentation/SocBoardQspiBoot
> > > 
> > > Yes. This seems to be that case. But I can't change it right now. So
> > > this "solution" with the soft-reset is better than nothing.
> > 
> > If this is some think that must require, any possibility to this
> > resetting prior to u-boot?
> > like preloader or in first stage boot loader or something.
> 
> u-boot-spl 2013.01/altera set it up like this for us; and mainline
> u-boot-spl does not work on socfpga... that's why we need to do it
> here, and that's why you don't see it on your board.

As discussed in person, please rebase and repost.

You're right that it's a good idea to add an option to restart the
SPI NOR in software if needed be.

Best regards,
Marek Vasut