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dumpimage: fit: extract FIT images

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The dumpimage is able to extract components contained in a FIT image:

  $ ./dumpimage -T flat_dt -i CONTAINER.ITB -p INDEX FILE

The CONTAINER.ITB is a regular FIT container file. The INDEX is the poisition
of the sub-image to be retrieved, and FILE is the file (path+name) to save the
extracted sub-image.

For example, given the following kernel.its to build a kernel.itb:

  /dts-v1/;
  / {
      ...
      images {
        kernel@1 {
          description = "Kernel 2.6.32-34";
          data = /incbin/("/boot/vmlinuz-2.6.32-34-generic");
          type = "kernel";
          arch = "ppc";
          os = "linux";
          compression = "gzip";
          load = <00000000>;
          entry = <00000000>;
          hash@1 {
            algo = "md5";
          };
        };
        ...
      };
      ...
    };

The dumpimage can extract the 'kernel@1' node through the following command:

  $ ./dumpimage -T flat_dt -i kernel.itb -p 0 kernel
  Extracted:
   Image 0 (kernel@1)
    Description:  Kernel 2.6.32-34
    Created:      Wed Oct 22 15:50:26 2014
    Type:         Kernel Image
    Compression:  gzip compressed
    Data Size:    4040128 Bytes = 3945.44 kB = 3.85 MB
    Architecture: PowerPC
    OS:           Linux
    Load Address: 0x00000000
    Entry Point:  0x00000000
    Hash algo:    md5
    Hash value:   22352ad39bdc03e2e50f9cc28c1c3652

Which results in the file 'kernel' being exactly the same as '/boot/vmlinuz-2.6.32-34-generic'.

Signed-off-by: Guilherme Maciel Ferreira <guilherme.maciel.ferreira@gmail.com>
This commit is contained in:
Guilherme Maciel Ferreira
2015-01-15 02:54:42 -02:00
committed by Tom Rini
parent 67f946cd18
commit 39931f966a
4 changed files with 204 additions and 3 deletions
Download Patch File Download Diff File Expand all files Collapse all files

30
common/image-fit.c
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@@ -112,6 +112,33 @@ static void fit_get_debug(const void *fit, int noffset,
fdt_strerror(err));
}
/**
* fit_get_subimage_count - get component (sub-image) count
* @fit: pointer to the FIT format image header
* @images_noffset: offset of images node
*
* returns:
* number of image components
*/
int fit_get_subimage_count(const void *fit, int images_noffset)
{
int noffset;
int ndepth;
int count = 0;
/* Process its subnodes, print out component images details */
for (ndepth = 0, count = 0,
noffset = fdt_next_node(fit, images_noffset, &ndepth);
(noffset >= 0) && (ndepth > 0);
noffset = fdt_next_node(fit, noffset, &ndepth)) {
if (ndepth == 1) {
count++;
}
}
return count;
}
#if !defined(CONFIG_SPL_BUILD) || defined(CONFIG_FIT_SPL_PRINT)
/**
* fit_print_contents - prints out the contents of the FIT format image
@@ -423,7 +450,8 @@ void fit_image_print(const void *fit, int image_noffset, const char *p)
}
}
}
#endif
#endif /* !defined(CONFIG_SPL_BUILD) || defined(CONFIG_FIT_SPL_PRINT) */
/**
* fit_get_desc - get node description property