[ptxdist] [PATCH v3] u-boot: Allow generation of boot script

[Alexander Dahl <ada@thorsis.com>]

From: Ahmad Fatoum <a.fatoum@pengutronix.de>

U-Boot can be configured via the environment to look for a boot script
in the rootfs. The boot script can then be used to customize the booting
process further.

Cc: Denis OSTERLAND <denis.osterland@diehl.com>
Co-authored-by: Alexander Dahl <ada@thorsis.com>
Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
Signed-off-by: Alexander Dahl <ada@thorsis.com>
---

Notes:
    v2 -> v3:
    
    * Renamed image file in compile stage (suggested by Denis OSTERLAND)
    * Added compile dependency to input file (suggested by Michael Olbrich)
    
    v1 -> v2 (Changes from the original patch by Ahmad, not send as v2):
    
    * Added compile stage from patch adding precompiled U-Boot env, but
      changed compile command to '@$(call world/compile, <PKG>)' as
      suggested by Denis OSTERLAND. (That patch was not merged upstream.)
    * Changed default script filename to 'boot.scr.uimg', because this is
      one of the defaults in 'config_distro_bootcmd.h' in U-Boot. (Took me
      only half a day to find why the script was not found here.)

 platforms/u-boot.in | 18 ++++++++++++++++++
 rules/u-boot.make   | 35 +++++++++++++++++++++++++++++++++++
 2 files changed, 53 insertions(+)

diff --git a/platforms/u-boot.in b/platforms/u-boot.in
index 5d04a3cbd..8af0c8271 100644
--- a/platforms/u-boot.in
+++ b/platforms/u-boot.in
@@ -71,6 +71,24 @@ config U_BOOT_CONFIG
 
 endif
 
+config U_BOOT_BOOT_SCRIPT
+	prompt "Compile U-Boot boot script"
+	bool
+	help
+	  Use U-Boot's mkimage to compile a U-Boot boot script and install it
+	  into the rootfs
+
+if U_BOOT_BOOT_SCRIPT
+
+config U_BOOT_BOOT_SCRIPT_ROOTFS_PATH
+	string
+	default "/boot/boot.scr.uimg"
+	prompt "Installation path"
+	help
+	  Target rootfs path where the U-Boot script should be located
+
+endif
+
 comment "target install"
 
 config U_BOOT_INSTALL_SREC
diff --git a/rules/u-boot.make b/rules/u-boot.make
index 55d18b97d..c03153e58 100644
--- a/rules/u-boot.make
+++ b/rules/u-boot.make
@@ -2,6 +2,7 @@
 #
 # Copyright (C) 2007 by Sascha Hauer
 #               2009, 2010 by Marc Kleine-Budde <mkl@pengutronix.de>
+#               2018 by Ahmad Fatoum <a.fatoum@pengutronix.de>
 #
 # See CREDITS for details about who has contributed to this project.
 #
@@ -34,6 +35,13 @@ endif
 # Prepare
 # ----------------------------------------------------------------------------
 
+ifdef PTXCONF_U_BOOT_BOOT_SCRIPT
+U_BOOT_BOOT_SCRIPT_TXT := $(call ptx/in-platformconfigdir, uboot.scr)
+U_BOOT_BOOT_SCRIPT_BIN := $(call remove_quotes, \
+	$(PTXCONF_U_BOOT_BOOT_SCRIPT_ROOTFS_PATH))
+$(STATEDIR)/u-boot.compile: $(U_BOOT_BOOT_SCRIPT_TXT)
+endif
+
 U_BOOT_WRAPPER_BLACKLIST := \
 	TARGET_HARDEN_STACKCLASH \
 	TARGET_HARDEN_RELRO \
@@ -82,6 +90,20 @@ $(STATEDIR)/u-boot.prepare:
 endif
 
 # ----------------------------------------------------------------------------
+# Compile
+# ----------------------------------------------------------------------------
+
+$(STATEDIR)/u-boot.compile:
+	@$(call targetinfo)
+	@$(call world/compile, U_BOOT)
+ifdef PTXCONF_U_BOOT_BOOT_SCRIPT
+	@$(U_BOOT_DIR)/tools/mkimage -T script -C none \
+		-d $(U_BOOT_BOOT_SCRIPT_TXT) \
+		$(U_BOOT_DIR)/boot.scr.uimg
+endif
+	@$(call touch)
+
+# ----------------------------------------------------------------------------
 # Install
 # ----------------------------------------------------------------------------
 
@@ -122,6 +144,19 @@ ifdef PTXCONF_U_BOOT_INSTALL_U_BOOT_WITH_SPL_PBL
 	@install -v -D -m644 $(U_BOOT_DIR)/u-boot-with-spl-pbl.bin \
 		$(IMAGEDIR)/u-boot-with-spl-pbl.bin
 endif
+
+ifdef PTXCONF_U_BOOT_BOOT_SCRIPT
+	@$(call install_init, u-boot)
+	@$(call install_fixup, u-boot, PRIORITY, optional)
+	@$(call install_fixup, u-boot, SECTION, base)
+	@$(call install_fixup, u-boot, AUTHOR, "Ahmad Fatoum <afa@pengutronix.de>")
+	@$(call install_fixup, u-boot, DESCRIPTION, "U-Boot boot script")
+
+	@$(call install_copy, u-boot, 0, 0, 0644, \
+		$(U_BOOT_DIR)/boot.scr.uimg, $(U_BOOT_BOOT_SCRIPT_BIN))
+
+	@$(call install_finish, u-boot)
+endif
 	@$(call touch)
 
 # ----------------------------------------------------------------------------
-- 
2.11.0


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