[U-Boot] [PATCH v3 6/8] powerpc: mpc85xx: Use binman to embed dtb inside U-Boot

[Jagdish Gediya <jagdish.gediya@nxp.com>]

Hi York,

> -----Original Message-----
> From: York Sun
> Sent: Wednesday, September 26, 2018 12:19 AM
> To: Jagdish Gediya <jagdish.gediya@nxp.com>; u-boot at lists.denx.de;
> Prabhakar Kushwaha <prabhakar.kushwaha@nxp.com>; Poonam Aggrwal
> <poonam.aggrwal@nxp.com>; sjg at chromium.org; bmeng.cn at gmail.com
> Cc: trini at konsulko.com
> Subject: Re: [PATCH v3 6/8] powerpc: mpc85xx: Use binman to embed dtb
> inside U-Boot
> 
> On 09/02/2018 10:08 PM, Jagdish Gediya wrote:
> > Below is the sequence to embed dtb inside U-Boot, 1. Remove bootpg and
> > resetvec section if needed 2. Append dtb 3. Append bootpg and resetvec
> > section back if removed in step 1
> >
> > Above procedure is required only when CONFIG_MPC85xx and
> > CONFIG_OF_SEPARATE are defined.
> >
> > Add new config CONFIG_MPC85XX_HAVE_RESET_VECTOR to indicate that
> image
> > has resetvec section. Step 1 and step 3 described above are required
> > only if this config is y.
> >
> > Signed-off-by: Jagdish Gediya <jagdish.gediya@nxp.com>
> > ---
> > Changes for v2:
> > 	- Don't change the generic target
> > 	- Add new config option to use binman
> >
> > Changes for v3:
> > 	- Commit message change('u-boot' -> 'U-Boot')
> >
> >  Makefile                         | 23 ++++++++++++++++++++++-
> >  arch/powerpc/cpu/mpc85xx/Kconfig |  4 ++++
> >  2 files changed, 26 insertions(+), 1 deletion(-)
> >
> > diff --git a/Makefile b/Makefile
> > index b5bf8ab..03baa74 100644
> > --- a/Makefile
> > +++ b/Makefile
> > @@ -861,6 +861,10 @@ ifneq ($(CONFIG_SYS_INIT_SP_BSS_OFFSET),)
> >  ALL-y += init_sp_bss_offset_check
> >  endif
> >
> > +ifeq ($(CONFIG_MPC85xx)$(CONFIG_OF_SEPARATE),yy)
> > +ALL-y += u-boot-with-dtb.bin
> > +endif
> > +
> 
> One thing confuses me is the output file. My understand is we will use u-
> boot-with-dtb.bin file. Other files are intermediate files. It would be helpful
> to explain each output file, especially for debugging, and let other know we
> switch from one file to another after this patch set.
I have already updated the board README for u-boot-with-dtb.bin. Apart from it, Only one new (u-boot-br.bin) intermediate  file is generated with respect to the existing U-Boot compilations flow. Should I update board README or commit message for u-boot-br.bin?
> 
> CONFIG_OF_SEPARATE seems not be selected explicitly anywhere. Are we
> relying on the first choice to be selected automatically? Is it guaranteed?
yes, We are relying on the first choice to be selected automatically. It should be guaranteed, I am seeing that no configs in U-Boot are enabling it explicitly but many board uses u-boot-dtb.bin or files based on u-boot-dtb.bin for booting which are only generated if CONFIG_OF_SEPARATE is enabled.

Regards,
Jagdish