[U-Boot] [PATCH 01/13] spl: Kconfig: Add SPL_<media>_SUPPORT as Kconfig option

[Tom Rini]

On Sun, Aug 21, 2016 at 01:35:48PM -0500, Andrew F. Davis wrote:
> On 08/19/2016 02:54 PM, Tom Rini wrote:
> > On Fri, Aug 19, 2016 at 02:30:56PM -0500, Andrew F. Davis wrote:
> >> On 08/19/2016 01:27 AM, Heiko Schocher wrote:
> >>> Hello Andrew,
> >>>
> >>> first thanks for this series!
> >>>
> >>> Am 18.08.2016 um 17:41 schrieb Andrew F. Davis:
> >>>> Create a new Kconfig file to contain SPL boot media loading support
> >>>> options as we begin moving these to the Kconfig system and out of header
> >>>> files. Initially add new configs for all the existing boot media types,
> >>>> giving them the same definition name as before to allow compatibility
> >>>> with systems not yet using Kconfig.
> >>>>
> >>>> Signed-off-by: Andrew F. Davis <afd at ti.com>
> >>>> ---
> >>>>   common/Kconfig     |  7 +++++++
> >>>>   common/spl/Kconfig | 54
> >>>> ++++++++++++++++++++++++++++++++++++++++++++++++++++++
> >>>>   2 files changed, 61 insertions(+)
> >>>>   create mode 100644 common/spl/Kconfig
> >>>>
> >>>> diff --git a/common/Kconfig b/common/Kconfig
> >>>> index 46e7173..f594db5 100644
> >>>> --- a/common/Kconfig
> >>>> +++ b/common/Kconfig
> >>>> @@ -156,6 +156,13 @@ config SPI_BOOT
> >>>>         booted via SPI flash. This is not a must, some SoCs need this,
> >>>>         somes not.
> >>>>
> >>>> +menu "SPL Media Loading Support"
> >>>> +    depends on SPL
> >>>> +
> >>>> +source "common/spl/Kconfig"
> >>>> +
> >>>> +endmenu
> >>>> +
> >>>>   endmenu
> >>>>
> >>>>   config BOOTDELAY
> >>>> diff --git a/common/spl/Kconfig b/common/spl/Kconfig
> >>>> new file mode 100644
> >>>> index 0000000..788ca14
> >>>> --- /dev/null
> >>>> +++ b/common/spl/Kconfig
> >>>> @@ -0,0 +1,54 @@
> >>>> +config SPL_YMODEM_SUPPORT
> >>>> +    depends on SPL
> >>>> +    bool "SPL Support for loading next stage from UART"
> >>>> +    help
> >>>> +      This option enables SPL to load the next stage bootloader
> >>>> +      over a UART line using the x/y/z/modem protocol.
> >>>> +
> >>>> +config SPL_MMC_SUPPORT
> >>>> +    bool "SPL Support for loading next stage from SD/MMC/eMMC"
> >>>> +    help
> >>>> +      This option enables SPL to load the next stage bootloader
> >>>> +      from an SD/MMC/eMMC device.
> >>>
> >>> Hmm.. why do you not move, for existing board configs, which use
> >>> this symbols, them into their defconfigs? There is the great
> >>> script from Masahiro
> >>>
> >>> u-boot:tools/moveconfig.py
> >>>
> >>> which should do the most things for you ... 
> >>
> >> Maybe I'm not understanding this script but after getting it to run it
> >> doesn't seem to find any uses of the config, I'm not sure this works
> >> with SPL configs, as the check looks only at the non-SPL build case as
> >> far as I can tell.
> > 
> > Hmm, Masahiro?  Can we support SPL related migrations easily?  Thanks!
> > 
> 
> Well a quick workaround I used was to add -DCONFIG_SPL_BUILD to the main
> Makefile, this way it will pick up SPL_ defines that are blocked of by
> conditionals for CONFIG_SPL_BUILD.
> 
> Anyway the bigger problem is that some boards conditionally define an
> option based on what other configs are enabled, we don't have this kind
> of thing in Kconfig, at least not at the board level as far as I know.
> (Select could work, but it would end up with a lot of conditionals per
> board supported)

I think the problem is that we have some "soft" dependencies here.  ie I
think that when I was making am335x_evm.h work for all of the various
possible board and feature combos that were desired I took some
short-cuts to say that A means lets grab B and C.  I think it's
perfectly reasonable that in moving to Kconfig we start out by getting
everything into Kconfig and worry about getting all of the select /
depends statements right as the second step.  So the defconfigs might
start out a bit fuller and we'll get options removed from them as the
Kconfig logic improves.

-- 
Tom
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