$(call cmd_link_o_target, $(OBJS))
# Specify the target for use in elftosb call
-ELFTOSB_TARGET-$(CONFIG_MX23) = imx23
-ELFTOSB_TARGET-$(CONFIG_MX28) = imx28
+MKIMAGE_TARGET-$(CONFIG_MX23) = mx23
+MKIMAGE_TARGET-$(CONFIG_MX28) = mx28
-$(OBJTREE)/u-boot.bd: $(SRCTREE)/$(CPUDIR)/$(SOC)/u-boot-$(ELFTOSB_TARGET-y).bd
+$(OBJTREE)/mxsimage.cfg: $(SRCTREE)/$(CPUDIR)/$(SOC)/mxsimage.$(MKIMAGE_TARGET-y).cfg
sed "s@OBJTREE@$(OBJTREE)@g" $^ > $@
-$(OBJTREE)/u-boot.sb: $(OBJTREE)/u-boot.bin $(OBJTREE)/spl/u-boot-spl.bin $(OBJTREE)/u-boot.bd
- elftosb -zf $(ELFTOSB_TARGET-y) -c $(OBJTREE)/u-boot.bd -o $(OBJTREE)/u-boot.sb
+$(OBJTREE)/u-boot.sb: $(OBJTREE)/u-boot.bin $(OBJTREE)/spl/u-boot-spl.bin $(OBJTREE)/mxsimage.cfg
+ $(OBJTREE)/tools/mkimage -n $(OBJTREE)/mxsimage.cfg -T mxsimage $@
+
#########################################################################
1) Prerequisites
----------------
-To make a MXS based board bootable, some tools are necessary. The first one is
-the "elftosb" tool distributed by Freescale Semiconductor. The other one is the
-"mxsboot" tool found in U-Boot source tree.
+To make a MXS based board bootable, some tools are necessary. The only
+mandatory tool is the "mxsboot" tool found in U-Boot source tree. The
+tool is built automatically when compiling U-Boot for i.MX23 or i.MX28.
+
+The production of BootStream image is handled via "mkimage", which is
+also part of the U-Boot source tree. The "mkimage" requires OpenSSL
+development libraries to be installed. In case of Debian and derivates,
+this is installed by running:
+
+ $ sudo apt-get install libssl-dev
+
+NOTE: The "elftosb" tool distributed by Freescale Semiconductor is no
+ longer necessary for general use of U-Boot on i.MX23 and i.MX28.
+ The mkimage supports generation of BootStream images encrypted
+ with a zero key, which is the vast majority of use-cases. In
+ case you do need to produce image encrypted with non-zero key
+ or other special features, please use the "elftosb" tool,
+ otherwise continue to section 2). The installation procedure of
+ the "elftosb" is outlined below:
Firstly, obtain the elftosb archive from the following location:
Make sure the "elftosb" binary can be found in your $PATH, in this case this
means "/usr/local/bin/" has to be in your $PATH.
-Install the 'libssl-dev' package as well. On a Debian-based distribution, this
-package can be installed as follows:
-
- $ sudo apt-get install libssl-dev
-
2) Compiling U-Boot for a MXS based board
-------------------------------------------
proper header to allow successful boot from SD or NAND. Adding the header is
discussed in the following chapters.
+NOTE: The process that produces u-boot.sb uses the mkimage to generate the
+ BootStream. The BootStream is encrypted with zero key. In case you need
+ some special features of the BootStream and plan on using the "elftosb"
+ tool instead, the invocation to produce a compatible BootStream with the
+ one produced by mkimage is outlined below. For further details, refer to
+ the documentation bundled with the "elftosb" package.
+
+ $ elftosb -zf imx23 -c arch/arm/cpu/arm926ejs/mxs/u-boot-imx23.bd \
+ -o u-boot.sb
+ $ elftosb -zf imx28 -c arch/arm/cpu/arm926ejs/mxs/u-boot-imx28.bd \
+ -o u-boot.sb
+
3) Installation of U-Boot for a MXS based board to SD card
----------------------------------------------------------