[U-Boot] [PATCH 3/3] spl: dfu: reduce spl-dfu MLO size

[Lukasz Majewski <lukma@denx.de>]

Hi Tom,

> On Wed, May 03, 2017 at 08:36:31AM +0000, B, Ravi wrote:
> > Tom
> > 
> > >>> 
> > >>> Yes you are correct. 
> > >>> But what is happening here is, the
> > >>> CONFIG_DFU_<MMC/NAND/SF/TFTP> selected through
> > >>> Kconfig/Menuconfig is applicable for both SPL and U-Boot. Hence
> > >>> CONFIG_DFU_MMC/NA
> > >ND/SF gets compiled for SPL as well, which needs run_command().
> > >Actually CONFIG_DFU_MMC/NAND/etc is not scoped for SPL-DFU.
> > >>> As we have aligned, not to increase the SPL size, user shall
> > >>> use SPL-DFU feature to boot to u-boot, then utilize the full
> > >>> featured DFU to flash MMC/NAND/SF.
> > >>> 
> > >>> I get undefined reference to common function run_command(),
> > >>> "dfu_fill_entitiy_<mmc/nand/sf>" in driver/dfu/dfu.c. The dfu.c
> > >>> is common for both SPL-DFU and U-boot.
> > 
> > >>OK.  I think we need to introduce SPL_DFU_xxx Kconfig options,
> > >>and use CONFIG_IS_ENABLED(DFU_xxx) so that we will get things
> > >>enabled/disabled (and discarded) as needed.
> > 
> > >Ok, will do.
> > 
> > Correct me if I am wrong, I need understand if we introduce say
> > SPL_DFU_MMC Kconfig options, then whether need to support DFU_MMC in
> > SPL ?
> > Again this will increase the SPL-size, and also DFU_MMC uses
> > run_command() again, there is dependency of cli.c, hush etc. 
> 
> SPL_DFU_MMC will only increase the size of SPL if it's enabled.  Being
> able to switch to testing with CONFIG_IS_ENABLED(DFU_xxx) means that
> we'll be able to keep the space savings while also not making various
> parts of the code harder to read with more #ifdef tests.
> 

+1

(and I would like to see the code soon :-) )

Best regards,

Lukasz Majewski

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