fdt: Improve the comment for fdt_shrink_to_minimum()
Add a bit more detail about what this function does.
Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/boot/fdt_support.c b/boot/fdt_support.c
index b15d077..090d82e 100644
--- a/boot/fdt_support.c
+++ b/boot/fdt_support.c
@@ -667,7 +667,6 @@
return node;
}
-/* Resize the fdt to its actual size + a bit of padding */
int fdt_shrink_to_minimum(void *blob, uint extrasize)
{
int i;
diff --git a/include/fdt_support.h b/include/fdt_support.h
index feda0d9..0601f5f 100644
--- a/include/fdt_support.h
+++ b/include/fdt_support.h
@@ -232,13 +232,23 @@
void set_working_fdt_addr(ulong addr);
/**
- * shrink down the given blob to minimum size + some extrasize if required
+ * fdt_shrink_to_minimum() - shrink FDT while allowing for some margin
+ *
+ * Shrink down the given blob to 'minimum' size + some extrasize.
+ *
+ * The new size is enough to hold the existing contents plus @extrasize bytes,
+ * plus 5 memory reservations. Also, the end of the FDT is aligned to a 4KB
+ * boundary, so it might end up up to 4KB larger than needed.
+ *
+ * If there is an existing memory reservation for @blob in the FDT, it is
+ * updated for the new size.
*
* @param blob FDT blob to update
* @param extrasize additional bytes needed
* Return: 0 if ok, or -FDT_ERR_... on error
*/
int fdt_shrink_to_minimum(void *blob, uint extrasize);
+
int fdt_increase_size(void *fdt, int add_len);
int fdt_delete_disabled_nodes(void *blob);