[PATCH] u-boot: Optionally deploy an environment or script file

[Ash Charles <ashcharles@gmail.com>]

Some boards are configured to read a script or environment file as part
of the u-boot boot sequence.  This file, typically called 'uEnv.txt' or
'boot.scr', would be deployed alongside the u-boot binary.  If a recipe
uses this u-boot.inc, such a file can be deployed by setting the optional
UBOOT_ENV parameter and including the file in the SRC_URI.  For example:

    SRC_URI_append_overo = "file://uEnv.txt"
    UBOOT_ENV_overo = "uEnv"

Signed-off-by: Ash Charles <ashcharles@gmail.com>
---
 meta/recipes-bsp/u-boot/u-boot.inc | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/meta/recipes-bsp/u-boot/u-boot.inc b/meta/recipes-bsp/u-boot/u-boot.inc
index d826a40..53c87c2 100644
--- a/meta/recipes-bsp/u-boot/u-boot.inc
+++ b/meta/recipes-bsp/u-boot/u-boot.inc
@@ -28,6 +28,17 @@ SPL_BINARY ?= ""
 SPL_IMAGE ?= "${SPL_BINARY}-${MACHINE}-${PV}-${PR}"
 SPL_SYMLINK ?= "${SPL_BINARY}-${MACHINE}"
 
+# Additional environment variables or a script can be installed alongside
+# u-boot to be used automatically on boot.  This file, typically 'uEnv.txt'
+# or 'boot.scr', should be packaged along with u-boot as well as placed in the
+# deploy directory.  Machine configurations needing one of these files should
+# include it in the SRC_URI and set the UBOOT_ENV parameter.
+UBOOT_ENV_SUFFIX ?= "txt"
+UBOOT_ENV ?= ""
+UBOOT_ENV_BINARY ?= "${UBOOT_ENV}.${UBOOT_ENV_SUFFIX}"
+UBOOT_ENV_IMAGE ?= "${UBOOT_ENV}-${MACHINE}-${PV}-${PR}.${UBOOT_ENV_SUFFIX}"
+UBOOT_ENV_SYMLINK ?= "${UBOOT_ENV}-${MACHINE}.${UBOOT_ENV_SUFFIX}"
+
 do_compile () {
 	if [ "${@bb.utils.contains('DISTRO_FEATURES', 'ld-is-gold', 'ld-is-gold', '', d)}" = "ld-is-gold" ] ; then
 		sed -i 's/$(CROSS_COMPILE)ld$/$(CROSS_COMPILE)ld.bfd/g' config.mk
@@ -62,6 +73,12 @@ do_install () {
         install ${S}/${SPL_BINARY} ${D}/boot/${SPL_IMAGE}
         ln -sf ${SPL_IMAGE} ${D}/boot/${SPL_BINARY}
     fi
+
+    if [ "x${UBOOT_ENV}" != "x" ]
+    then
+        install ${WORKDIR}/${UBOOT_ENV_BINARY} ${D}/boot/${UBOOT_ENV_IMAGE}
+        ln -sf ${UBOOT_ENV_IMAGE} ${D}/boot/${UBOOT_ENV_BINARY}
+    fi
 }
 
 FILES_${PN} = "/boot ${sysconfdir}"
@@ -82,6 +99,14 @@ do_deploy () {
         ln -sf ${SPL_IMAGE} ${DEPLOYDIR}/${SPL_BINARY}
         ln -sf ${SPL_IMAGE} ${DEPLOYDIR}/${SPL_SYMLINK}
     fi
+
+    if [ "x${UBOOT_ENV}" != "x" ]
+    then
+        install ${WORKDIR}/${UBOOT_ENV_BINARY} ${DEPLOYDIR}/${UBOOT_ENV_IMAGE}
+        rm -f ${DEPLOYDIR}/${UBOOT_ENV_BINARY} ${DEPLOYDIR}/${UBOOT_ENV_SYMLINK}
+        ln -sf ${UBOOT_ENV_IMAGE} ${DEPLOYDIR}/${UBOOT_ENV_BINARY}
+        ln -sf ${UBOOT_ENV_IMAGE} ${DEPLOYDIR}/${UBOOT_ENV_SYMLINK}
+    fi
 }
 
 addtask deploy before do_build after do_compile
-- 
1.8.3.2