[U-Boot,1/2] SPL: Makefile: Build a separate autoconf.mk for SPL

SPL defines CONFIG_SPL_BUILD but this does not percolate to the autoconf.mk Makefile.
As a result the build breaks when CONFIG_SPL_BUILD is used in the board-specific include
header file. With this, there is a possibility of having a CONFIG option defined in the
header file but not defined in the Makefile causing all kinds of build failure and problems.

It also messes things for up, for example, when one might want to undefine options to
keep the SPL small and doesn't want to be stuck with the CONFIG options used for U-boot.
Lastly, this also avoids defining special CONFIG_SPL_ variables for cases where some
options are required in U-boot but not in SPL.

We add a spl-autoconf.mk rule that is generated for SPL with the CONFIG_SPL_BUILD flag
and conditionally include it for SPL builds.

Signed-off-by: Joel A Fernandes <joelagnel@ti.com>
---
 Makefile  |   19 +++++++++++++++++--
 config.mk |    6 ++++++
 2 files changed, 23 insertions(+), 2 deletions(-)

On Tue, May 07, 2013 at 10:52:54AM -0500, Joel A Fernandes wrote:

> SPL defines CONFIG_SPL_BUILD but this does not percolate to the
> autoconf.mk Makefile.  As a result the build breaks when
> CONFIG_SPL_BUILD is used in the board-specific include header file.
> With this, there is a possibility of having a CONFIG option defined in
> the header file but not defined in the Makefile causing all kinds of
> build failure and problems.
> 
> It also messes things for up, for example, when one might want to
> undefine options to keep the SPL small and doesn't want to be stuck
> with the CONFIG options used for U-boot.  Lastly, this also avoids
> defining special CONFIG_SPL_ variables for cases where some options
> are required in U-boot but not in SPL.
> 
> We add a spl-autoconf.mk rule that is generated for SPL with the
> CONFIG_SPL_BUILD flag and conditionally include it for SPL builds.

This breaks tegra boards such as ventura and a number of others
currently, please fix.  Thanks!

Hi Tom,
Sorry for the delay as I've been traveling.

On Friday, May 17, 2013, Tom Rini wrote:

> On Tue, May 07, 2013 at 10:52:54AM -0500, Joel A Fernandes wrote:
>
> > SPL defines CONFIG_SPL_BUILD but this does not percolate to the
> > autoconf.mk Makefile.  As a result the build breaks when
> > CONFIG_SPL_BUILD is used in the board-specific include header file.
> > With this, there is a possibility of having a CONFIG option defined in
> > the header file but not defined in the Makefile causing all kinds of
> > build failure and problems.
> >
> > It also messes things for up, for example, when one might want to
> > undefine options to keep the SPL small and doesn't want to be stuck
> > with the CONFIG options used for U-boot.  Lastly, this also avoids
> > defining special CONFIG_SPL_ variables for cases where some options
> > are required in U-boot but not in SPL.
> >
> > We add a spl-autoconf.mk rule that is generated for SPL with the
> > CONFIG_SPL_BUILD flag and conditionally include it for SPL builds.
>
> This breaks tegra boards such as ventura and a number of others
> currently, please fix.  Thanks!


 I don't have a tegra. Is this a build or runtime issue? If its build ,
I'll try building some of those targets and let you know. Might be 1 to 2
more days once I get back today.

Regards,
Joel

>


> --
> Tom
>

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On 05/18/2013 02:22 PM, Joel A Fernandes wrote:
> Hi Tom, Sorry for the delay as I've been traveling.
> 
> On Friday, May 17, 2013, Tom Rini wrote:
> 
> On Tue, May 07, 2013 at 10:52:54AM -0500, Joel A Fernandes wrote:
> 
>> SPL defines CONFIG_SPL_BUILD but this does not percolate to the 
>> autoconf.mk <http://autoconf.mk> Makefile.  As a result the 
>> build
> breaks when
>> CONFIG_SPL_BUILD is used in the board-specific include header 
>> file. With this, there is a possibility of having a CONFIG
>> option defined in the header file but not defined in the
>> Makefile causing all kinds of build failure and problems.
>> 
>> It also messes things for up, for example, when one might want to
>> undefine options to keep the SPL small and doesn't want to be 
>> stuck with the CONFIG options used for U-boot.  Lastly, this
>> also avoids defining special CONFIG_SPL_ variables for cases
>> where some options are required in U-boot but not in SPL.
>> 
>> We add a spl-autoconf.mk <http://spl-autoconf.mk> rule that is
> generated for SPL with the
>> CONFIG_SPL_BUILD flag and conditionally include it for SPL 
>> builds.
> 
> This breaks tegra boards such as ventura and a number of others 
> currently, please fix.  Thanks!
> 
> 
> I don't have a tegra. Is this a build or runtime issue? If its 
> build , I'll try building some of those targets and let you know. 
> Might be 1 to 2 more days once I get back today.

It's build time.  Once you've fixed one, please make sure that MAKEALL
- -a arm completes without error.  Thanks!

- -- 
Tom
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