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

[Pavel Machek]

On Wed 2014-10-01 20:25:55, 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?

Actually, this has nothing to do with SPI NOR reset logic.

Yes, we need to reset NOR flash during u-boot startup, because
hardware was already initialized to 4-byte addressing by
u-boot-spl. No matter what reset logic does, if it passes u-boot-spl
(and SPI NOR is actually used), it will be in 4-byte mode.

And no, mainline u-boot-spl is not usable on socfpga, and probably will
not be usable for a whill, so u-boot-spl from altera is only option
here.

So.. what to do?

Do you want this patch? Do you want patch that know how to switch back
to 3-byte addressing on this particular flash?

Best regards,
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html