[U-Boot] [PATCH 2/4] imx: Align the imximage header and payload to multiples of 4k

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

On Monday, February 25, 2013 7:19:55 PM, Marek Vasut wrote:
> The MX53 ROM loads the data from NAND in multiples of pages and
> supports maximum page size of 4k. Thus, align the image and header
> to 4k to be safe from ROM bugs.
> 
> 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>
> ---
>  tools/imximage.c |   11 +++++++----
>  tools/imximage.h |    3 ++-
>  2 files changed, 9 insertions(+), 5 deletions(-)
> 
> diff --git a/tools/imximage.c b/tools/imximage.c
> index fa308c9..c018562 100644
> --- a/tools/imximage.c
> +++ b/tools/imximage.c
> @@ -518,11 +518,14 @@ static void imximage_set_header(void *ptr, struct stat
> *sbuf, int ifd,
>  
>  	/*
>  	 * ROM bug alert
> -	 * mx53 only loads 512 byte multiples.
> -	 * The remaining fraction of a block bytes would
> -	 * not be loaded.
> +	 *
> +	 * MX53 only loads 512 byte multiples in case of SD boot.
> +	 * MX53 only loads NAND page multiples in case of NAND boot and
> +	 * supports up to 4096 byte large pages, thus align to 4096.
> +	 *
> +	 * The remaining fraction of a block bytes would not be loaded!
>  	 */
> -	*header_size_ptr = ROUND(sbuf->st_size + imxhdr->flash_offset, 512);
> +	*header_size_ptr = ROUND(sbuf->st_size + imxhdr->flash_offset, 4096);
>  }
>  
>  int imximage_check_params(struct mkimage_params *params)
> diff --git a/tools/imximage.h b/tools/imximage.h
> index 42b6090..dfd2e9e 100644
> --- a/tools/imximage.h
> +++ b/tools/imximage.h
> @@ -151,13 +151,14 @@ typedef struct {
>  	dcd_v2_t dcd_table;
>  } imx_header_v2_t;
>  
> +/* The header must be aligned to 4k on MX53 for NAND boot */
>  struct imx_header {
>  	union {
>  		imx_header_v1_t hdr_v1;
>  		imx_header_v2_t hdr_v2;
>  	} header;
>  	uint32_t flash_offset;
> -};
> +} __attribute__((aligned(4096)));

So what is the exact rule for the image start page in the FCB? Is it just
0x400 + 4096 + start page * page size? This does not seem to match table 7-12,
unless 0 has a special meaning?

>  
>  typedef void (*set_dcd_val_t)(struct imx_header *imxhdr,
>  					char *name, int lineno,
> --
> 1.7.10.4
> 
> 

Best regards,
Beno?t