fng-install: Fixed post-install for fngsystem

The post-install for fngsystem is running in a temp directory.
This directory was missing the new artifacts (devicetree and overlays)
to properly run.
Further, the combine step of kernel + devicetree was failing for
fngsystem, because the fngsystem partition is too small (at least for
i.MX8 devices). To work around this, the post-install scripts checks
for a "combine_kernel" file in the boot partition and only combines
the kernel and the devicetree if the file is present.

Cherry-pick from 4c3847e5

conf/machine/include/seco-mx8.inc

@@ -80,6 +80,14 @@ KERNEL_IMAGETYPE = "Image"
 # Seems not to get set for i.MX8. So far, no idea how this is going to work... PIC?
 LOADADDR = ""
 
+IMAGE_BOOT_FILES:append = " \
+    devicetree \
+"
+
+IMAGE_BOOT_FILES:remove = " \
+    combine_kernel \
+"
+
 # @NOTE: The configuration of the WIC image is outdated.
 # Since we don't use WIC images in general, we disable the
 # creation for now.

conf/machine/include/seconorth-machine.inc

@@ -49,6 +49,7 @@ MACHINE_FEATURES = " \
 
 IMAGE_BOOT_FILES:append = " \
     ${@' '.join([ dtb.split('/')[-1] for dtb in d.getVar('KERNEL_DEVICETREE').split() ] )} \
+    combine_kernel \
 "
 
 # Take the first devicetree from KERNEL_DEVICETREE as DEFAULT_DEVICETREE

recipes-bsp/bootscript/bootscript-alt.bb

@@ -9,13 +9,19 @@ inherit deploy
 RPROVIDES:${PN} += " boot-alt.cfg  "
 PROVIDES += " boot-alt.cfg  "
 
+RPROVIDES:${PN}:append:mx6 = " combine_kernel "
+PROVIDES:append:mx6 = " combine_kernel "
+
+RPROVIDES:${PN}:append:mx8 = " devicetree "
+PROVIDES:append:mx8 = " devicetree "
+
 SRC_URI = " \
     file://boot-alt.cfg \
 "
 
 S = "${WORKDIR}"
 
-RAMDISK_OFFSET="0x2C00000"
+RAMDISK_OFFSET = "0x2C00000"
 
 do_configure() {
     # Insert the correct load address for the target platform
@@ -24,6 +30,14 @@ do_configure() {
     sed -i boot-alt.cfg -e "s|devicetree=.*|devicetree=${DEFAULT_DEVICETREE}|"
 }
 
+do_install:append:mx6() {
+    touch ${D}/boot/combine_kernel
+}
+
+do_install:append:mx8() {
+    echo ${DEFAULT_DEVICETREE} >> ${D}/boot/devicetree
+}
+
 do_install() {
     install -d ${D}/boot
     install -m 0644 ${S}/boot-alt.cfg ${D}/boot/boot-alt.cfg
@@ -33,6 +47,17 @@ do_deploy() {
     install ${S}/boot-alt.cfg ${DEPLOYDIR}/boot-alt.cfg
 }
 
+do_deploy:append:mx6() {
+    install ${D}/boot/combine_kernel ${DEPLOYDIR}/combine_kernel
+}
+
+do_deploy:append:mx8() {
+    install ${D}/boot/devicetree ${DEPLOYDIR}/devicetree
+}
+
 FILES:${PN} = "boot/boot-alt.cfg"
+FILES:${PN}:append:mx6 = " boot/combine_kernel "
+FILES:${PN}:append:mx8 = " boot/devicetree "
+
 addtask do_deploy after do_install
 do_deploy[cleandirs] = "${DEPLOYDIR}"

recipes-bsp/bootscript/bootscript.bb

@@ -9,6 +9,9 @@ inherit deploy
 RPROVIDES:${PN} += " boot.cfg "
 PROVIDES += " boot.cfg "
 
+RPROVIDES:${PN}:append:mx6 = " combine_kernel "
+PROVIDES:append:mx6 = " combine_kernel "
+
 RPROVIDES:${PN}:append:mx8 = " devicetree "
 PROVIDES:append:mx8 = " devicetree "
 
@@ -22,6 +25,10 @@ do_configure() {
     sed -i boot.cfg -e "s|devicetree=.*|devicetree=${DEFAULT_DEVICETREE}|"
 }
 
+do_install:append:mx6() {
+    touch ${D}/boot/combine_kernel
+}
+
 do_install() {
     install -d ${D}/boot
     install -m 0644 ${S}/boot.cfg ${D}/boot/boot.cfg
@@ -32,4 +39,5 @@ do_install:append:mx8() {
 }
 
 FILES:${PN} = "boot/boot.cfg"
+FILES:${PN}:append:mx6 = " boot/combine_kernel "
 FILES:${PN}:append:mx8 = " boot/devicetree "