[PATCH v4 2/3] uboot-sign: support to create users specific image tree source

[Jamin Lin <jamin_lin@aspeedtech.com>]

Currently, uboot-sign.bbclass only supports to create Image Tree Source(ITS)
for "u-boot" and "flat_dt". However, users may want to support their private
images for specific application and purpose.

To make this bbclass more flexible and support users specific ITS, creates new
"uboot_fitimage_user_image" function. It is an empty function, so users can
create a bbappend to overwrite this function with their specific settings.

Otherwise, users need to overwrite the "uboot_fitimage_assemble" function.

Add a variable "UBOOT_FIT_USER_IMAGE" to enable users specific ITS generation
and it is disable by default.

Add a variable "UBOOT_FIT_CONF_USER_LOADABLES" to load users specific images
and it is an empty by default.

Signed-off-by: Jamin Lin <jamin_lin@aspeedtech.com>
---
 meta/classes-recipe/uboot-sign.bbclass | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/meta/classes-recipe/uboot-sign.bbclass b/meta/classes-recipe/uboot-sign.bbclass
index f1b3470127..3b61f239e3 100644
--- a/meta/classes-recipe/uboot-sign.bbclass
+++ b/meta/classes-recipe/uboot-sign.bbclass
@@ -100,6 +100,13 @@ UBOOT_FIT_ARM_TRUSTED_FIRMWARE_IMAGE ?= "bl31.bin"
 UBOOT_FIT_TEE ?= "0"
 UBOOT_FIT_TEE_IMAGE ?= "tee-raw.bin"
 
+# User specific image
+UBOOT_FIT_USER_IMAGE ?= "0"
+
+# Unit name containing a list of users additional binaries to be loaded.
+# It is a comma-separated list of strings.
+UBOOT_FIT_CONF_USER_LOADABLES ?= ''
+
 UBOOT_FIT_UBOOT_LOADADDRESS ?= "${UBOOT_LOADADDRESS}"
 UBOOT_FIT_UBOOT_ENTRYPOINT ?= "${UBOOT_ENTRYPOINT}"
 
@@ -246,6 +253,12 @@ do_uboot_generate_rsa_keys() {
 
 addtask uboot_generate_rsa_keys before do_uboot_assemble_fitimage after do_compile
 
+# Create a ITS file for the user specific image. It is an empty function and
+# users should create a bbappend to overwrite this function
+uboot_fitimage_user_image() {
+	bbwarn "Please add your specific image ITS settings for u-boot FIT image generation."
+}
+
 # Create a ITS file for the atf
 uboot_fitimage_atf() {
 	cat << EOF >> ${UBOOT_ITS}
@@ -366,6 +379,13 @@ EOF
 		conf_loadables="\"atf\", ${conf_loadables}"
 		uboot_fitimage_atf
 	fi
+
+	if [ "${UBOOT_FIT_USER_IMAGE}" = "1" ] ; then
+		if [ -n "${UBOOT_FIT_CONF_USER_LOADABLES}" ] ; then
+			conf_loadables="${conf_loadables}${UBOOT_FIT_CONF_USER_LOADABLES}"
+		fi
+		uboot_fitimage_user_image
+	fi
 	cat << EOF >> ${UBOOT_ITS}
     };
 
-- 
2.25.1