[PATCH] fastboot: inform user if barebox update falls back to raw copy

Ahmad Fatoum a.fatoum at pengutronix.de
Tue May 31 02:35:37 PDT 2022

Fastboot code determines whether to go into barebox update handler by
checking whether filetype_is_barebox_image() returns true for the image.
This is different from the barebox_update command which leaves it to the
individual handlers to decide whether an image is suitable.

Coupled with eMMC boot partitions, this could lead to
`barebox_update -t mmc` updating the boot partition, while a
`fastboot flash bbu-mmc` will write the image to the user area instead.

It may be worth breaking backwards compatibility here and refuse update
in that case, but for now at least alert the user that a raw copy is
being attempted.

Signed-off-by: Ahmad Fatoum <a.fatoum at pengutronix.de>
 common/fastboot.c | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/common/fastboot.c b/common/fastboot.c
index f8ed40c86e00..50ea8421d92c 100644
--- a/common/fastboot.c
+++ b/common/fastboot.c
@@ -673,7 +673,7 @@ static void cb_flash(struct fastboot *fb, const char *cmd)
 		goto out;
-	if (IS_ENABLED(CONFIG_BAREBOX_UPDATE) && filetype_is_barebox_image(filetype)) {
 		void *buf;
 		struct bbu_handler *handler;
 		struct bbu_data data = {
@@ -681,6 +681,17 @@ static void cb_flash(struct fastboot *fb, const char *cmd)
 			.flags = BBU_FLAG_YES,
+		if (!filetype_is_barebox_image(filetype)) {
+			if (strstarts(fentry->name, "bbu-")) {
+				fastboot_tx_print(fb, FASTBOOT_MSG_INFO,
+						  "This is _not_ a barebox image...");
+				fastboot_tx_print(fb, FASTBOOT_MSG_INFO,
+						  "Falling back to raw copy to %s", filename);
+			}
+			goto copy;
+		}
 		handler = bbu_find_handler_by_device(data.devicefile);
 		if (!handler)
 			goto copy;

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