[U-Boot] SPL Linux Boot

[Stefano Babic]

Hi,

this is a new submission of the Simon's work to add a way to
boot Linux directly from the SPL. From the last patchset series,
the main changes introduced by me are the following:

- compile the cache functions in SPL to make cleanup_before_linux()
  available.
- do not call I"C function on boards where I2C is not available
- fix a bug from last version (fallback to U-Boot)
- move all related SPL stuff to common/ and fix omap related
  functions.

Tested on the twister board (patches for this board in u-boot-ti, next)

Note: to test it is also required Simon's patch:

	arm: Add Prep subcommand support to bootm

http://patchwork.ozlabs.org/patch/129753/


[PATCH V11  01/13] Add cmd_spl command
[PATCH V11  02/13] devki8000: add config for spl command
[PATCH V11  03/13] omap-common: Add NAND SPL linux booting
[PATCH V11  04/13] devkit8000/spl: init GPMC for dm9000 in SPL
[PATCH V11  05/13] omap-common/spl: Add linux boot to SPL
[PATCH V11  06/13] omap/spl: change output of spl_parse_image_header
[PATCH V11  07/13] devkit8000: Implement and activate direct OS boot
[PATCH V11  08/13] Add cache functions to SPL for armv7
[PATCH V11  09/13] OMAP3: SPL: do not call I2C init if no I2C is
[PATCH V11  10/13] OMAP3: move SPL files to be used by other
[PATCH V11  11/13] TI: SPL: make SPL available for other SOCs as TI
[PATCH V11  12/13] SPL: call cleanup_before_linux() before booting
[PATCH V11  13/13] OMAP3: twister: add support to boot Linux from