[PATCH] Documentation: i.MX: point out that barebox-*-u.img is i.MX6-specific

[Ahmad Fatoum <a.fatoum@pengutronix.de>]

We don't use the DCD table for RAM setup on i.MX8M, so no special
barebox binary is needed for USB upload.

CONFIG_HABV4_IMAGE_SIGNED_USB is already i.MX6-specific, but point this
out in the documentation explicitly as well.

Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
---
 Documentation/boards/imx.rst | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Documentation/boards/imx.rst b/Documentation/boards/imx.rst
index 2a5168190620..13246599838b 100644
--- a/Documentation/boards/imx.rst
+++ b/Documentation/boards/imx.rst
@@ -131,7 +131,7 @@ barebox supports generating signed images, signed USB images suitable for
 *imx-usb-loader* and encrypted images.
 
 In contrast to normal (unsigned) images booting signed images via
-imx-usb-loader requires special images:
+imx-usb-loader on i.MX6 (but not in i.MX8M) requires special images:
 DCD data is invalidated (DCD pointer set to zero), the image is then signed and
 afterwards the DCD pointer is set to the DCD data again (practically making
 the signature invalid).
-- 
2.39.2