[U-Boot] [PATCH 00/12] SPL mmc refactor and alternate boot device feature

[Nikita Kiryanov]

Hi Otavio,

On Thu, Oct 22, 2015 at 10:24:57AM -0200, Otavio Salvador wrote:
> On Thu, Oct 22, 2015 at 10:01 AM, Nikita Kiryanov <nikita at compulab.co.il> wrote:
> > This series has two parts: patches 1-7 perform refactors aimed at reducing the
> > ifdef complexity of SPL mmc code (and some nand as well). This refactor also
> > addresses a few design issues I noticed while working on the refactor.
> >
> > The rest of the series introduces a new SPL feature that allows board code to
> > define a list of boot devices that SPL will try before failing (instead of the
> > only one device it attempts now). This feature is useful for implementing
> > fallbacks, as well as reacting to bootROM sequences. For example:
> >
> > On CM-FX6, if boot from the alternate boot device (MMC) fails, the bootROM
> > proceeds to try boot from SPI flash. If the SPI flash boot is succesful, SPL
> > will still try to load U-Boot from MMC, instead of from the actual boot device
> > (SPI flash), and probably fail and hang. The alternate boot feature makes it
> > possible for SPL to follow the MMC boot attempt with boot from the SPI flash.
> > The CM-FX6 based miniature PC Utilite depends on this capability for its SPI
> > flash boot to work, since SPI flash boot is only attempted if MMC boot fails.
> >
> > This series was tested on CM-FX6 and compile tested for arm and powerpc.
> 
> Thanks a lot for working on this; it does improves the SPL framework
> and extends its feature set. One thing I missed is the patches to
> rework the current boards removing the defines the serie drops and a
> proper documentation in the README files.

I'll make the additions once it's clear what part of the spl_mmc
refactor is accepted. There shouldn't be much changes for the board
files though, since the #defines themselves are not eliminated, just
that their checks are moved to a place where they will not make it
difficult to read the source code.

> 
> -- 
> Otavio Salvador                             O.S. Systems
> http://www.ossystems.com.br        http://code.ossystems.com.br
> Mobile: +55 (53) 9981-7854            Mobile: +1 (347) 903-9750
>