spl: fit: add support for post-processing of images

The next stage boot loader image and the selected FDT can be post-
processed by board/platform/device-specific code, which can include
modifying the size and altering the starting source address before
copying these binary blobs to their final destination. This might be
desired to do things like strip headers or footers attached to the
images before they were packaged into the FIT, or to perform operations
such as decryption or authentication. Introduce new configuration
option CONFIG_SPL_FIT_IMAGE_POST_PROCESS to allow controlling this
feature. If enabled, a platform-specific post-process function must
be provided.

Signed-off-by: Daniel Allred <d-allred@ti.com>
Signed-off-by: Andreas Dannenberg <dannenberg@ti.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

1 files changed, 17 insertions, 0 deletions

diff --git a/include/image.h b/include/image.h
index d788c260e3..93d39e12e1 100644
--- a/include/image.h
+++ b/include/image.h
@@ -1173,4 +1173,21 @@ void android_print_contents(const struct andr_img_hdr *hdr);
  */
 int board_fit_config_name_match(const char *name);
 
+#ifdef CONFIG_SPL_FIT_IMAGE_POST_PROCESS
+/**
+ * board_fit_image_post_process() - Do any post-process on FIT binary data
+ *
+ * This is used to do any sort of image manipulation, verification, decryption
+ * etc. in a platform or board specific way. Obviously, anything done here would
+ * need to be comprehended in how the images were prepared before being injected
+ * into the FIT creation (i.e. the binary blobs would have been pre-processed
+ * before being added to the FIT image).
+ *
+ * @image: pointer to the image start pointer
+ * @size: pointer to the image size
+ * @return no return value (failure should be handled internally)
+ */
+void board_fit_image_post_process(void **p_image, size_t *p_size);
+#endif /* CONFIG_SPL_FIT_IMAGE_POST_PROCESS */
+
 #endif	/* __IMAGE_H__ */