[U-Boot] [PATCH v3 1/2] spl: Add an option to load a FIT containing U-Boot from FS

Simon Glass sjg at chromium.org
Wed Apr 20 16:41:36 CEST 2016


On 13 April 2016 at 23:15, Lokesh Vutla <lokeshvutla at ti.com> wrote:
> This provides a way to load a FIT containing U-Boot and a selection of device
> tree files from a File system.
>
> Signed-off-by: Lokesh Vutla <lokeshvutla at ti.com>
> ---
> Changes since v2:
> - Fixed the number of bytes being copied.
>
>  common/spl/spl_fit.c | 148 +++++++++++++++++++++++++++++++++++++++++++--------
>  include/spl.h        |  31 +++++++++++
>  2 files changed, 156 insertions(+), 23 deletions(-)
>
> diff --git a/common/spl/spl_fit.c b/common/spl/spl_fit.c
> index 1a5c027..f5d47c5 100644
> --- a/common/spl/spl_fit.c
> +++ b/common/spl/spl_fit.c
> @@ -82,12 +82,42 @@ static int spl_fit_select_fdt(const void *fdt, int images, int *fdt_offsetp)
>         return -ENOENT;
>  }
>
> +#define get_fit_size(fit) ALIGN(fdt_totalsize(fit), 4)
> +
> +static int spl_parse_fit_header(void *fit)
> +{
> +       int node;
> +
> +       spl_image.images = fdt_path_offset(fit, FIT_IMAGES_PATH);
> +       if (spl_image.images < 0) {
> +               debug("%s: Cannot find /images node: %d\n", __func__,
> +                     spl_image.images);
> +               return -1;
> +       }
> +       node = fdt_first_subnode(fit, spl_image.images);
> +       if (node < 0) {
> +               debug("%s: Cannot find first image node: %d\n", __func__, node);
> +               return -1;
> +       }
> +
> +       /* Get its information and set up the spl_image structure */
> +       spl_image.data_offset = fdt_getprop_u32(fit, node, "data-offset");
> +       spl_image.data_size = fdt_getprop_u32(fit, node, "data-size");
> +       spl_image.load_addr = fdt_getprop_u32(fit, node, "load");
> +       debug("data_offset=%x, data_size=%x\n", spl_image.data_offset,
> +             spl_image.data_size);
> +       spl_image.entry_point = spl_image.load_addr;
> +       spl_image.os = IH_OS_U_BOOT;
> +
> +       return 0;
> +}
> +
>  int spl_load_simple_fit(struct spl_load_info *info, ulong sector, void *fit)
>  {
>         int sectors;
>         ulong size, load;
>         unsigned long count;
> -       int node, images;
> +       int images, ret;
>         void *load_ptr;
>         int fdt_offset, fdt_len;
>         int data_offset, data_size;
> @@ -99,9 +129,8 @@ int spl_load_simple_fit(struct spl_load_info *info, ulong sector, void *fit)
>          * Figure out where the external images start. This is the base for the
>          * data-offset properties in each image.
>          */
> -       size = fdt_totalsize(fit);
> -       size = (size + 3) & ~3;
> -       base_offset = (size + 3) & ~3;
> +       size = get_fit_size(fit);
> +       base_offset = size;
>
>         /*
>          * So far we only have one block of data from the FIT. Read the entire
> @@ -125,26 +154,13 @@ int spl_load_simple_fit(struct spl_load_info *info, ulong sector, void *fit)
>         if (count == 0)
>                 return -EIO;
>
> -       /* find the firmware image to load */
> -       images = fdt_path_offset(fit, FIT_IMAGES_PATH);
> -       if (images < 0) {
> -               debug("%s: Cannot find /images node: %d\n", __func__, images);
> +       ret = spl_parse_fit_header(fit);
> +       if (ret < 0)
>                 return -1;
> -       }
> -       node = fdt_first_subnode(fit, images);
> -       if (node < 0) {
> -               debug("%s: Cannot find first image node: %d\n", __func__, node);
> -               return -1;
> -       }
> -
> -       /* Get its information and set up the spl_image structure */
> -       data_offset = fdt_getprop_u32(fit, node, "data-offset");
> -       data_size = fdt_getprop_u32(fit, node, "data-size");
> -       load = fdt_getprop_u32(fit, node, "load");
> -       debug("data_offset=%x, data_size=%x\n", data_offset, data_size);
> -       spl_image.load_addr = load;
> -       spl_image.entry_point = load;
> -       spl_image.os = IH_OS_U_BOOT;
> +       data_offset = spl_image.data_offset;
> +       data_size = spl_image.data_size;
> +       load = spl_image.load_addr;
> +       images = spl_image.images;
>
>         /*
>          * Work out where to place the image. We read it so that the first
> @@ -192,3 +208,89 @@ int spl_load_simple_fit(struct spl_load_info *info, ulong sector, void *fit)
>
>         return 0;
>  }
> +
> +int spl_fs_load_simple_fit(struct spl_load_info *info, const char *filename,
> +                          void *fit)
> +{
> +       ulong size, load;
> +       unsigned long count;
> +       int images, ret;
> +       void *load_ptr;
> +       int fdt_offset, fdt_len;
> +       int data_offset, data_size, file_offset;
> +       int base_offset = 0, align_len;
> +       void *dst;
> +
> +       /*
> +        * Figure out where the external images start. This is the base for the
> +        * data-offset properties in each image.
> +        */
> +       size = get_fit_size(fit);
> +       base_offset = size;
> +
> +       /*
> +        * Read the entire FIT header, placing it so it finishes before
> +        * where we will load the image. Also the load address is aligned
> +        * ARCH_DMA_MINALIGN.
> +        */
> +       align_len = ARCH_DMA_MINALIGN - 1;
> +       fit = (void *)((CONFIG_SYS_TEXT_BASE - size - align_len) & ~align_len);
> +       debug("FIT header read: destination = 0x%p, size = %lx\n", fit, size);
> +       count = info->fs_read(info, filename, fit, 0, size);
> +       if (count <= 0)
> +               return -EIO;
> +
> +       ret = spl_parse_fit_header(fit);
> +       if (ret < 0)
> +               return -1;
> +       data_offset = spl_image.data_offset;
> +       data_size = spl_image.data_size;
> +       load = spl_image.load_addr;
> +       images = spl_image.images;
> +
> +       /*
> +        * Work out where to place the image. Assuming load addr of u-boot.bin
> +        * is always aligned to ARCH_DMA_MINALIGN. It is possible that file
> +        * offset is not aligned. In order to make sure that the file read is
> +        * dma aligned, align the file offset to dma with extra bytes in the
> +        * beginning. Then do a memcpy of image to dst.
> +        */
> +       data_offset += base_offset;
> +       file_offset = data_offset & ~align_len;
> +       load_ptr = (void *)load;
> +       dst = load_ptr;
> +
> +       /* Read the image */
> +       debug("Temp u-boot.bin read from fit: dst = 0x%p, file offset = 0x%x, size = 0x%x\n",
> +             dst, file_offset, data_size);
> +       count = info->fs_read(info, filename, dst, file_offset,
> +                             data_size + (data_offset & align_len));
> +       if (count <= 0)
> +               return -EIO;
> +       debug("u-boot.bin load: dst = 0x%p, size = 0x%x\n", dst, data_size);
> +       memcpy(dst, dst + (data_offset & align_len), data_size);
> +
> +       /* Figure out which device tree the board wants to use */
> +       fdt_len = spl_fit_select_fdt(fit, images, &fdt_offset);
> +       if (fdt_len < 0)
> +               return fdt_len;
> +
> +       /*
> +        * Read the device tree and place it after the image. Making sure that
> +        * load addr and file offset are aligned to dma.
> +        */
> +       dst = (void *)((load + data_size + align_len) & ~align_len);
> +       fdt_offset += base_offset;
> +       file_offset = fdt_offset & ~align_len;
> +       debug("Temp fdt read from fit: dst = 0x%p, file offset = 0x%x, size = %d\n",
> +             dst, file_offset, data_size);
> +       count = info->fs_read(info, filename, dst, file_offset,
> +                             fdt_len + (fdt_offset & align_len));
> +       if (count <= 0)
> +               return -EIO;
> +       debug("fdt load: dst = 0x%p, size = 0x%x\n", load_ptr + data_size,
> +             data_size);
> +       memcpy(load_ptr + data_size, dst + (fdt_offset & align_len), fdt_len);

There is still a lot of duplicated code. Can you figure out a way to
factor this out?

> +
> +       return 1;
> +}
> diff --git a/include/spl.h b/include/spl.h
> index de4f70a..5f0b0db 100644
> --- a/include/spl.h
> +++ b/include/spl.h
> @@ -27,6 +27,11 @@ struct spl_image_info {
>         u32 entry_point;
>         u32 size;
>         u32 flags;
> +#ifdef CONFIG_SPL_LOAD_FIT
> +       int data_offset;
> +       int data_size;
> +       int images;

Comments please

> +#endif
>  };
>
>  /*
> @@ -36,6 +41,7 @@ struct spl_image_info {
>   * @priv: Private data for the device
>   * @bl_len: Block length for reading in bytes
>   * @read: Function to call to read from the device
> + * @fs_read: Function to call to read from a fs
>   */
>  struct spl_load_info {
>         void *dev;
> @@ -43,10 +49,35 @@ struct spl_load_info {
>         int bl_len;
>         ulong (*read)(struct spl_load_info *load, ulong sector, ulong count,
>                       void *buf);
> +       int (*fs_read)(struct spl_load_info *load, const char *filename,
> +                     void *buf, ulong file_offset, ulong size);
>  };
>
> +/**
> + * spl_load_simple_fit() - Loads a fit image from a device.
> + * @info:      Structure containing the information required to load data.
> + * @sector:    Sector number where FIT image is located in the device
> + * @fdt:       Pointer to the copied FIT header.
> + *
> + * Reads the FIT image @sector in the device. Loads u-boot image to
> + * specified load address and copies the dtb to end of u-boot image.
> + * Returns 0 on success.
> + */
>  int spl_load_simple_fit(struct spl_load_info *info, ulong sector, void *fdt);
>
> +/**
> + * spl_fs_load_simple_fit() - Loads a fit image from a file system.
> + * @info:      Structure containing the information required to load data.
> + * @filename:  Name of the FIT image in the file system.
> + * @fit:       Pointer to the copied FIT header.
> + *
> + * Reads the FIT image in the filesystem. Loads u-boot image to
> + * specified load address and copies the dtb to end of u-boot image.
> + * Returns 1 on success.

Should return 0 on success?

> + */
> +int spl_fs_load_simple_fit(struct spl_load_info *info, const char *filename,
> +                          void *fit);
> +
>  #define SPL_COPY_PAYLOAD_ONLY  1
>
>  extern struct spl_image_info spl_image;
> --
> 2.1.4
>

Regards,
Simon


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