[U-Boot] [PATCH 1/4] common: imx: Implement generic u-boot.nand target

["Benoît Thébaudeau" <benoit.thebaudeau@advansee.com>]

Hi Marek,

On Monday, February 25, 2013 7:19:54 PM, Marek Vasut wrote:
> Implement u-boot.nand target that can be reused with a small amount of
> churn across all CPU models. The idea is to delegate the u-boot.nand target
> out of the main Makefile and into the CPU's Makefile (very similar to what
> u-boot.imx does now). The main Makefile shall only contain path to which the
> u-boot.nand target is delegated. Hopefully this will not produce too much
> bloat in the main Makefile.
> 
> To demonstrate this implementation, add u-boot.nand target for i.MX53.
> 
> Signed-off-by: Marek Vasut <marex@denx.de>
> Cc: Beno?t Th?baudeau <benoit.thebaudeau@advansee.com>
> Cc: Fabio Estevam <fabio.estevam@freescale.com>
> Cc: Stefano Babic <sbabic@denx.de>
> ---
>  Makefile                     |   18 ++++++++++++++++++
>  arch/arm/imx-common/Makefile |    6 ++++++
>  2 files changed, 24 insertions(+)
> 
> diff --git a/Makefile b/Makefile
> index 41054b7..8b1010a 100644
> --- a/Makefile
> +++ b/Makefile
> @@ -470,6 +470,23 @@ $(obj)u-boot.img:	$(obj)u-boot.bin
>  $(obj)u-boot.imx: $(obj)u-boot.bin depend
>  		$(MAKE) -C $(SRCTREE)/arch/arm/imx-common $(obj)u-boot.imx
>  
> +#
> +# Generic u-boot.nand target.
> +#
> +# Every CPU that needs u-boot.nand must add a path to an implementation of
> +# the actual u-boot.nand generator below.
> +#
> +ifdef CONFIG_MX53
> +CONFIG_NAND_TRG_PATH := $(SRCTREE)/arch/arm/imx-common
> +endif
> +
> +$(obj)u-boot.nand: $(obj)u-boot.bin depend
> +		if [ "X$(CONFIG_NAND_TRG_PATH)X" = "XX" ] ; then		\
> +			echo "This CPU does not support u-boot.nand target!" ;	\
> +			exit 1 ;						\
> +		fi
> +		$(MAKE) -C $(CONFIG_NAND_TRG_PATH) $(obj)u-boot.nand
> +
>  $(obj)u-boot.kwb:       $(obj)u-boot.bin
>  		$(obj)tools/mkimage -n $(CONFIG_SYS_KWD_CONFIG) -T kwbimage \
>  		-a $(CONFIG_SYS_TEXT_BASE) -e $(CONFIG_SYS_TEXT_BASE) -d $< $@
> @@ -857,6 +874,7 @@ clobber:	tidy
>  	@rm -f $(obj)u-boot.kwb
>  	@rm -f $(obj)u-boot.pbl
>  	@rm -f $(obj)u-boot.imx
> +	@rm -f $(obj)u-boot.nand
>  	@rm -f $(obj)u-boot.ubl
>  	@rm -f $(obj)u-boot.ais
>  	@rm -f $(obj)u-boot.dtb
> diff --git a/arch/arm/imx-common/Makefile b/arch/arm/imx-common/Makefile
> index 5d5c5b2..71ea36f 100644
> --- a/arch/arm/imx-common/Makefile
> +++ b/arch/arm/imx-common/Makefile
> @@ -50,6 +50,12 @@ $(obj)u-boot.imx: $(OBJTREE)/u-boot.bin
> $(OBJTREE)/$(patsubst "%",%,$(CONFIG_IMX
>  	$(OBJTREE)/tools/mkimage -n $(filter-out %.bin,$^) -T imximage \
>  	-e $(CONFIG_SYS_TEXT_BASE) -d $< $@
>  
> +$(obj)u-boot.nand: $(obj)u-boot.imx
> +	(								\
> +		echo -ne '\x00\x00\x00\x00\x46\x43\x42\x20\x01' ;	\
                     ^
It does not work in my environment (Ubuntu 12.10). -ne is interpreted as text,
so the FCB is broken. This is because /bin/sh (set to dash) is invoked by
default on my machine here. It would work with the /bin/bash set by the main
Makefile for SHELL, but this is not passed to the sub-make.

So what do you think we should do:
 1) Add "export SHELL" to the main Makefile?
 2) Move the SHELL assignment from the main Makefile to the top-level config.mk?
 3) Set "SHELL=$(SHELL)" on the command line when invoking the sub-make?
 4) Use printf instead of echo?
 5) Something else?

I like 1). Do you see possible side effects?

I will add a patch for that in my v8 once we have made a choice if this choice
is a global fix (i.e. 1 or 2).

> +		dd if=/dev/zero bs=1015 count=1 2>/dev/null ) |		\
> +	cat - $< > $@
> +
>  $(obj)SPL: $(OBJTREE)/spl/u-boot-spl.bin $(OBJTREE)/$(patsubst
>  "%",%,$(CONFIG_IMX_CONFIG)).cfgtmp
>  	$(OBJTREE)/tools/mkimage -n $(filter-out %.bin,$^) -T imximage \
>  	-e $(CONFIG_SPL_TEXT_BASE) -d $< $@

Best regards,
Beno?t