[U-Boot] [PATCH v2 2/3] arm:at91: enable ROM loadable atmel image

[Bo Shen]

Hi Andreas,

On 05/16/2014 05:59 PM, Andreas Bießmann wrote:
> For sama5d3xek we need to modify the SPL image for correct detection by ROM
> code.
>
> Signed-off-by: Andreas Bießmann <andreas.devel at googlemail.com>
> ---
>
> Changes in v2:
> * add -n switch to mkimage for PMECC type NAND and CONFIG_SYS_NANDFLASH
>
>   arch/arm/cpu/armv7/at91/config.mk |   10 ++++++++++
>   doc/README.atmel_pmecc            |   30 ++++++++++++++++++++++++++++++
>   spl/Makefile                      |   18 ++++++++++++++++++
>   3 files changed, 58 insertions(+)
>   create mode 100644 arch/arm/cpu/armv7/at91/config.mk
>
> diff --git a/arch/arm/cpu/armv7/at91/config.mk b/arch/arm/cpu/armv7/at91/config.mk
> new file mode 100644
> index 0000000..09eab70
> --- /dev/null
> +++ b/arch/arm/cpu/armv7/at91/config.mk
> @@ -0,0 +1,10 @@
> +#
> +# Copyright (C) 2014, Andreas Bießmann <andreas.devel at googlemail.com>
> +#
> +# SPDX-License-Identifier:	GPL-2.0+
> +#
> +ifdef CONFIG_SPL_BUILD
> +ALL-y	+= boot.bin
> +else
> +ALL-y	+= u-boot.img
> +endif
> diff --git a/doc/README.atmel_pmecc b/doc/README.atmel_pmecc
> index cf8373b..5a93123 100644
> --- a/doc/README.atmel_pmecc
> +++ b/doc/README.atmel_pmecc
> @@ -27,3 +27,33 @@ Take AT91SAM9X5EK as an example, the board definition file likes:
>   #define CONFIG_ATMEL_NAND_HW_PMECC	1
>   #define CONFIG_PMECC_CAP		2
>   #define CONFIG_PMECC_SECTOR_SIZE	512
> +
> +How to enable PMECC header for direct programmable boot.bin
> +-----------------------------------------------------------
> +2014-05-15 Andreas Bießmann <andreas.devel at googlemail.com>
> +
> +The usual way to program SPL into NAND flash is to use the SAM-BA Atmel tool.
> +This however is often not usable when doing field updates. To be able to
> +program a SPL binary into NAND flash we need to add the PMECC header to the
> +binary before. Chapter '12.4.4.1 NAND Flash Boot: NAND Flash Detection' in
> +sama5d3 SoC spec (as of 03. April 2014). We have a new image type added to
> +mkimage to generate this PMECC header and integrated into the build process of
> +SPL.
> +The required parameters in board configuration header are as follows:
> +
> +This example is working for sama5d3xek:
> +
> +#define CONFIG_SPL_AT91_HEADER_USE_PMECC	1
> +#define CONFIG_SPL_AT91_HEADER_SECTOR_PER_PAGE	4
> +#define CONFIG_SPL_AT91_HEADER_SECTOR_SIZE	CONFIG_PMECC_SECTOR_SIZE
> +#define CONFIG_SPL_AT91_HEADER_SPARE_SIZE	64
> +#define CONFIG_SPL_AT91_HEADER_ECC_BITS		CONFIG_PMECC_CAP
> +#define CONFIG_SPL_AT91_HEADER_ECC_OFFSET	36

Just a nitpick here:

Can we take this parameter from the existing definition while not use 
new definition? Or else, if the header using different parameter with 
what u-boot nand driver use, then if flash through u-boot, it won't boot.

> +It enables the PMECC hardware and set the relevant parameters as known from
> +the SAM-BA tool. We are able to use other defined values here cause we check
> +these values in the buildsystem. Therefore the CONFIG_PMECC_SECTOR_SIZE is
> +expanded to the correct value set some lines above.
> +
> +The mkimage image type atmelimage also set the 6'th interrupt vector to the
> +correct value. This feature can also be used to setup a boot.bin for MMC boot.
> diff --git a/spl/Makefile b/spl/Makefile
> index 55500fd..8c6397e 100644
> --- a/spl/Makefile
> +++ b/spl/Makefile
> @@ -183,6 +183,24 @@ MKIMAGEFLAGS_MLO.byteswap = -T omapimage -n byteswap -a $(CONFIG_SPL_TEXT_BASE)
>   MLO MLO.byteswap: $(obj)/u-boot-spl.bin
>   	$(call if_changed,mkimage)
>
> +ATMEL_NAND_HEADER = usePmecc=$(CONFIG_SPL_AT91_HEADER_USE_PMECC), \
> +	sectorPerPage=$(CONFIG_SPL_AT91_HEADER_SECTOR_PER_PAGE), \
> +	sectorSize=$(CONFIG_SPL_AT91_HEADER_SECTOR_SIZE), \
> +	spareSize=$(CONFIG_SPL_AT91_HEADER_SPARE_SIZE), \
> +	eccBits=$(CONFIG_SPL_AT91_HEADER_ECC_BITS), \
> +	eccOffset=$(CONFIG_SPL_AT91_HEADER_ECC_OFFSET)
> +
> +MKIMAGEFLAGS_boot.bin = -T atmelimage
> +
> +ifdef CONFIG_ATMEL_NAND_HW_PMECC
> +ifeq ($(CONFIG_SYS_USE_NANDFLASH),y)
> +MKIMAGEFLAGS_boot.bin += -n $(subst $(space),,$(ATMEL_NAND_HEADER))
> +endif
> +endif
> +
> +boot.bin: $(obj)/u-boot-spl.bin
> +	$(call if_changed,mkimage)
> +
>   ALL-y	+= $(obj)/$(SPL_BIN).bin
>
>   ifdef CONFIG_SAMSUNG
>

Best Regards,
Bo Shen