tools: kwboot: Recalculate 4-byte data checksum after injecting baudr…

…ate code If data part of image is modified, update 4-byte data checksum. It looks like A385 BootROM does not verify this checksum for image loaded via UART, but we do not know if other BootROMs are also ignoring it. It is always better to provide correct checksum. Signed-off-by: Pali Rohár <[email protected]> [ refactored ] Signed-off-by: Marek Behún <[email protected]> Reviewed-by: Stefan Roese <[email protected]>
hramrach · Nov 3, 2021 · 82c5a0a · 82c5a0a
1 parent 063cb35
commit 82c5a0a
Showing 1 changed file with 3 additions and 0 deletions.
diff --git a/tools/kwboot.c b/tools/kwboot.c
@@ -1544,6 +1544,9 @@ kwboot_img_patch(void *img, size_t *size, int baudrate)
 		kwboot_printv("Injecting code for changing baudrate back\n");
 		_inject_baudrate_change_code(img, size, 1, baudrate, 115200);
 
+		/* Update the 32-bit data checksum */
+		*kwboot_img_csum32_ptr(img) = kwboot_img_csum32(img);
+
 		/* recompute header size */
 		hdrsz = kwbheader_size(hdr);
 	}