[U-Boot] [PATCH 1/3] i.MX6: mx6qsabrelite: add CONFIG_REVISION_TAG

[Marek Vasut <marex@denx.de>]

> On 03/04/2012 01:59 PM, Marek Vasut wrote:
> >> On 03/02/2012 03:59 PM, Marek Vasut wrote:
> >>>>    Freescale 2.6.38 (Non-DT) kernels require the revision atag to
> >>>>    enable the VPU.
> >>>> 
> >>>> Signed-off-by: Eric Nelson<eric.nelson@boundarydevices.com>
> >>>> ---
> >>>> 
> >>>>    board/freescale/mx6qsabrelite/mx6qsabrelite.c |    7 +++++++
> >>>>    include/configs/mx6qsabrelite.h               |    1 +
> >>>>    2 files changed, 8 insertions(+), 0 deletions(-)
> >>>> 
> >>>> diff --git a/board/freescale/mx6qsabrelite/mx6qsabrelite.c
> >>>> b/board/freescale/mx6qsabrelite/mx6qsabrelite.c index db1bea9..590030b
> >>>> 100644
> >>>> --- a/board/freescale/mx6qsabrelite/mx6qsabrelite.c
> >>>> +++ b/board/freescale/mx6qsabrelite/mx6qsabrelite.c
> >>>> @@ -215,6 +215,13 @@ int board_mmc_init(bd_t *bis)
> >>>> 
> >>>>    }
> >>>>    #endif
> >>>> 
> >>>> +#ifdef CONFIG_REVISION_TAG
> >>>> +u32 get_board_rev(void)
> >>>> +{
> >>>> +	return 0x63000 ;
> >>>> +}
> >>>> +#endif
> >>>> +
> >>>> 
> >>>>    #ifdef CONFIG_MXC_SPI
> >>>>    iomux_v3_cfg_t ecspi1_pads[] = {
> >>>>    
> >>>>    	/* SS1 */
> >>>> 
> >>>> diff --git a/include/configs/mx6qsabrelite.h
> >>>> b/include/configs/mx6qsabrelite.h index 93000f0..85f6f7a 100644
> >>>> --- a/include/configs/mx6qsabrelite.h
> >>>> +++ b/include/configs/mx6qsabrelite.h
> >>>> @@ -33,6 +33,7 @@
> >>>> 
> >>>>    #define CONFIG_CMDLINE_TAG
> >>>>    #define CONFIG_SETUP_MEMORY_TAGS
> >>>>    #define CONFIG_INITRD_TAG
> >>>> 
> >>>> +#define CONFIG_REVISION_TAG
> >>> 
> >>> I think you can avoid this define altogether, you're using it anyway.
> >> 
> >> Hi Marek,
> >> 
> >> I'm not sure I understand.
> >> 
> >> I need to define CONFIG_REVISION_TAG in order to get bootm to add
> >> 
> >> the tag:
> >> 	http://git.denx.de/?p=u-
> > 
> > boot.git;a=blob;f=arch/arm/lib/bootm.c;h=afa0093df
> > 
> >> 7620606ee12b4dc1dd2ee37adee347c;hb=master#l137
> >> 
> >> I made get_board_rev() conditional so we can get rid of it if (once)
> >> we're only using DT kernels.
> > 
> > You have CONFIG_REVISION_TAG set unconditionally, so you don't need the
> > macro around that get_revision() function. I might be wrong.
> 
> You're right. Its just that I did that deliberately so you can save the
> (admittedly) small amount of code by editing mx6qsabrelite.h.

Shouldn't that be removed by the compiler anyway?
> 
> Since U-Boot doesn't really have a configuration step, I find that
> folks tend to tweak the board configuration file quite a bit based
> on their needs.

This needs to be fixed, we need kbuild. Who's up to doing it ? ;-D
> 
> Though it's a bit of a hack, we even formalized it on our i.MX5x products
> to allow customers to keep their git repositories clean:
> 	http://boundarydevices.com/blogs/customizing-u-boot-on-i-mx

That's good, thank you :)

Cheers!
M