[U-Boot] [PATCH 1/3] common: add ifdefs around bouncebuf.c body

[Marek Vasut <marex@denx.de>]

Dear Stephen Warren,

> On 11/06/2012 03:57 PM, Marek Vasut wrote:
> > Dear Stephen Warren,
> > 
> >> On 11/06/2012 03:43 PM, Marek Vasut wrote:
> >>> Dear Stephen Warren,
> >>> 
> >>>> On 11/05/2012 05:54 PM, Marek Vasut wrote:
> >>>>> Dear Stephen Warren,
> >>>>> 
> >>>>>> From: Stephen Warren <swarren@nvidia.com>
> >>>>>> 
> >>>>>> If a U-Boot config file enables CONFIG_BOUNCE_BUFFER only for the
> >>>>>> main U-Boot build and not for the SPL, then config.mk will contain
> >>>>>> CONFIG_BOUNCE_BUFFER=y, so common/Makefile will build bouncebuf.c
> >>>>>> for both the SPL and main U-Boot, but config.h won't set
> >>>>>> CONFIG_BOUNCE_BUFFER for the SPL, so bouncebuf.h will provide static
> >>>>>> inline functions, which will conflict with the compiled bouncebuf.c.
> >>>>>> Solve this by guarding the body of bouncebuf.c with the ifdef to
> >>>>>> avoid conflicts.
> >>>>> 
> >>>>> Uh, don't you want the bounce buffer not compiled in for SPL? Then
> >>>>> maybe add CONFIG_SPL_BOUNCE_BUFFER to force BB to be compiled into
> >>>>> SPL or something ...
> >>>> 
> >>>> Not compiling bouncebuf.c for SPL would solve this too. I have no idea
> >>>> what build system contortions would be required to do this though. Do
> >>>> you think the build system should be fixed first rather than taking
> >>>> this series/patch?
> >>>> 
> >>>> I guess we shouldn't need a separate CONFIG_SPL_BOUNCE_BUFFER option
> >>>> though; we should rather simply set CONFIG_SPL_BOUNCE_BUFFER
> >>>> appropriately for SPL and non-SPL, and have everything key off that
> >>>> one variable, right?
> >>> 
> >>> How will you be able to configure it separately for spl and non-spl ?
> >> 
> >> For example,
> >> 
> >> include/configs/trimslice.h contains:
> >> 
> >> /* SD/MMC */
> >> #define CONFIG_MMC
> >> #define CONFIG_GENERIC_MMC
> >> #define CONFIG_TEGRA_MMC
> >> #define CONFIG_CMD_MMC
> >> 
> >> However, we don't use MMC in our SPL, but don't want to pollute every
> >> Tegra board file with ifdefs for SPL, so
> >> include/configs/tegra-common-post.h (which is included at the end of
> >> trimslice.h) contains:
> >> 
> >> #ifdef CONFIG_SPL_BUILD
> >> ...
> >> /* remove MMC support */
> >> #ifdef CONFIG_MMC
> >> #undef CONFIG_MMC
> >> #endif
> >> #ifdef CONFIG_GENERIC_MMC
> >> #undef CONFIG_GENERIC_MMC
> >> #endif
> >> #ifdef CONFIG_TEGRA_MMC
> >> #undef CONFIG_TEGRA_MMC
> >> #endif
> >> #ifdef CONFIG_CMD_MMC
> >> #undef CONFIG_CMD_MMC
> >> #endif
> >> ...
> >> #endif
> >> 
> >> And in the V1 patch I proposed to tegra-common-post.h, I added the
> >> following at the end:
> >> 
> >> #ifdef CONFIG_TEGRA_MMC
> >> #define CONFIG_BOUNCE_BUFFER
> >> #endif
> > 
> > Yet, this doesn't solve the problem with SPL ... since for SPL, you'd
> > have to do ifdef CONFIG_SPL, no?
> 
> Sorry, what problem with the SPL is this not solving?

I think I was tired when replying (sorry, the conference is really heavy on me). 
I though you wanted to disable BB only for SPL, but now I see BB being enabled 
depends on tegra mmc.

btw. shouldn't --gc-sections remove BB code if it's not used at all?

Best regards,