[U-Boot] [PATCH 6/9] spl: Add support for overlaying U-Boot DT

[Lukasz Majewski <lukma@denx.de>]

Hi Marek,

> Add support for loading fitImage with device tree overlay image, which
> is applied to the U-Boot's own device tree. Once the DT is applied,
> the fitImage loading process is restarted.
> 
> This patch allows a usecase where the DTO patches ie. load address in
> the U-Boot's DT or patches in a new public key for authenticating the
> subsequently loaded fitImages.
> 
> Signed-off-by: Marek Vasut <marex@denx.de>
> Cc: Pantelis Antoniou <pantelis.antoniou@konsulko.com>
> Cc: Simon Glass <sjg@chromium.org>
> ---
>  common/spl/spl.c | 38 +++++++++++++++++++++++++++++++++++++-
>  1 file changed, 37 insertions(+), 1 deletion(-)
> 
> diff --git a/common/spl/spl.c b/common/spl/spl.c
> index d429ea2c82..2444abbb08 100644
> --- a/common/spl/spl.c
> +++ b/common/spl/spl.c
> @@ -140,6 +140,38 @@ void spl_set_header_raw_uboot(struct
> spl_image_info *spl_image) }
>  
>  #ifdef CONFIG_SPL_LOAD_FIT_FULL
> +#ifdef CONFIG_OF_LIBFDT_OVERLAY
> +static int spl_fit_overlay_uboot_fdt_full(const struct image_header
> *header) +{
> +	bootm_headers_t images;
> +	const char *fit_uname_config = NULL;
> +	const char *fit_uname_dtbo = "u-boot-dtbo";
> +	ulong dto_data = 0;
> +	ulong dto_len = 0;
> +	int ret;
> +
> +	ret = fit_image_load(&images, (ulong)header,
> +			     &fit_uname_dtbo, &fit_uname_config,
> +			     IH_ARCH_DEFAULT, IH_TYPE_FLATDT, -1,
> +			     FIT_LOAD_OPTIONAL, &dto_data, &dto_len);
> +	if (ret < 0)
> +		return 0;
> +
> +	ret = fdt_overlay_apply_verbose((struct fdt_header
> *)gd->fdt_blob,
> +					(void *)dto_data);
> +	if (ret)
> +		hang();
> +
> +	/* Restart the loading process to cater for the DT changes */
> +	return -EAGAIN;
> +}
> +#else
> +static int spl_fit_overlay_uboot_fdt_full(const struct image_header
> *header) +{
> +	return 0;
> +}
> +#endif
> +
>  /* Parse and load full fitImage in SPL */
>  static int spl_load_fit_image(struct spl_image_info *spl_image,
>  			      const struct image_header *header)
> @@ -152,6 +184,10 @@ static int spl_load_fit_image(struct
> spl_image_info *spl_image, ulong fw_len = 0, dt_len = 0;
>  	int ret;
>  
> +	ret = spl_fit_overlay_uboot_fdt_full(header);
> +	if (ret)
> +		return ret;
> +
>  	ret = fit_image_load(&images, (ulong)header,
>  			     NULL, &fit_uname_config,
>  			     IH_ARCH_DEFAULT, IH_TYPE_STANDALONE, -1,
> @@ -182,7 +218,7 @@ int spl_parse_image_header(struct spl_image_info
> *spl_image, {
>  #ifdef CONFIG_SPL_LOAD_FIT_FULL
>  	int ret = spl_load_fit_image(spl_image, header);
> -	if (!ret)
> +	if (!ret || ret == -EAGAIN)
>  		return ret;
>  #endif
>  	if (image_get_magic(header) == IH_MAGIC) {

Reviewed-by: Lukasz Majewski <lukma@denx.de>

Best regards,

Lukasz Majewski

--

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