image-sparse: disable data cache to avoid misaligned warnings

Signed-off-by: Gary Bisson <gary.bisson@boundarydevices.com>

lib/image-sparse.c

@@ -62,6 +62,7 @@ int write_sparse_image(struct sparse_storage *info,
 	chunk_header_t *chunk_header;
 	uint32_t total_blocks = 0;
 	int fill_buf_num_blks;
+	int dcache_enabled = dcache_status();
 	int i;
 	int j;
 
@@ -106,6 +107,10 @@ int write_sparse_image(struct sparse_storage *info,
 
 	puts("Flashing Sparse Image\n");
 
+	/* Disable data cache since chunks might not be aligned */
+	if (dcache_enabled)
+		dcache_disable();
+
 	/* Start processing chunks */
 	blk = info->start;
 	for (chunk = 0; chunk < sparse_header->total_chunks; chunk++) {
@@ -248,6 +253,10 @@ int write_sparse_image(struct sparse_storage *info,
 		}
 	}
 
+	/* Re-enable data cache it in case it was in the first place */
+	if (dcache_enabled)
+		dcache_enable();
+
 	debug("Wrote %d blocks, expected to write %d blocks\n",
 	      total_blocks, sparse_header->total_blks);
 	printf("........ wrote %u bytes to '%s'\n", bytes_written, part_name);