[U-Boot] Query on u-boot

[Jagan Teki]

On Mon, Mar 24, 2014 at 9:31 AM, S Durga Prasad Paladugu
<durgaprasad.psdp at gmail.com> wrote:
> Hi,
>
> I have a below query on u-boot bootup.
>
> When UBOOT does not detect NOR flash during bootup it throws up an error
> message that indicates that  uboot did not detect NOR flash and stops
> there.
> But when uboot does not detect QSPI flash it just gives a warning message
> that uboot
> sf_probe_failed, and comes to the uboot prompt.
>
> Why is this behavior different for NOR flash and QSPI flash.

As per my understanding wrt code is concern.

Yes - this can be an implementation logic where the SPI/QSPI flash
code is more handy
with the users while using spi/sf commands. Due to this we couldn't
need/have any
architecture initialization calls unlike with NAND/NOR - arch/arm/lib/board.c

The initialization code that resides in arch' board file generally
have safe monitored where
something can't get at the time of board init phase, they might give
an err/warn to exit.
this is not the case in spi/qspi where most of the initialization is
done through user interaction
unlike in arch' board files.

Did you see any special need/requirement to behave SPI/QSPI similar to NOR?

thanks!
-- 
Jagan.