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Diffstat (limited to 'doc/README.mxs')
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diff --git a/doc/README.mxs b/doc/README.mxs index 2919bbfee1..0235a5aeaf 100644 --- a/doc/README.mxs +++ b/doc/README.mxs @@ -27,9 +27,25 @@ Contents 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: @@ -63,11 +79,6 @@ copy the binary by hand: 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 ------------------------------------------- @@ -112,6 +123,18 @@ The code produces "u-boot.sb" file. This file needs to be augmented with a 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 ---------------------------------------------------------- |