From 399c744b22459585dc2dda2cb7353b3026e28e18 Mon Sep 17 00:00:00 2001 From: Simon Glass Date: Thu, 13 Jun 2013 15:10:07 -0700 Subject: mkimage: Add -r option to specify keys that must be verified Normally, multiple public keys can be provided and U-Boot is not required to use all of them for verification. This is because some images may not be signed, or may be optionally signed. But we still need a mechanism to determine when a key must be used. This feature cannot be implemented in the FIT itself, since anyone could change it to mark a key as optional. The requirement for key verification must go in with the public keys, in a place that is protected from modification. Add a -r option which tells mkimage to mark all keys that it uses for signing as 'required'. If some keys are optional and some are required, run mkimage several times (perhaps with different key directories if some keys are very secret) using the -F flag to update an existing FIT. Signed-off-by: Simon Glass Reviewed-by: Marek Vasut --- doc/mkimage.1 | 6 ++++++ 1 file changed, 6 insertions(+) (limited to 'doc') diff --git a/doc/mkimage.1 b/doc/mkimage.1 index b67a35178a..14374da88a 100644 --- a/doc/mkimage.1 +++ b/doc/mkimage.1 @@ -133,6 +133,12 @@ the corresponding public key is written into this file for for run-time verification. Typically the file here is the device tree binary used by CONFIG_OF_CONTROL in U-Boot. +.TP +.BI "\-r +Specifies that keys used to sign the FIT are required. This means that they +must be verified for the image to boot. Without this option, the verification +will be optional (useful for testing but not for release). + .SH EXAMPLES List image information: -- cgit v1.2.1