[U-Boot] [PATCH v3] README.mx28evk: add

[Marek Vasut]

Dear Otavio Salvador,

> This is mainline a copy of README.m28 changing the references to the
> mx28evk counterpart and removing NAND instructions as it is not
> supported by the board.
> 
> Signed-off-by: Otavio Salvador <otavio at ossystems.com.br>
> Acked-by: Fabio Estevam <fabio.estevam at freescale.com>
> ---
>  doc/README.mx28evk |  153
> ++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 files changed, 153
> insertions(+), 0 deletions(-)
>  create mode 100644 doc/README.mx28evk
> 
> diff --git a/doc/README.mx28evk b/doc/README.mx28evk
> new file mode 100644
> index 0000000..ddca310
> --- /dev/null
> +++ b/doc/README.mx28evk
> @@ -0,0 +1,153 @@
> +Freescale MX28EVK
> +=================
> +
> +This document describes the Freescale MX28EVK U-Boot port. This document
> mostly +covers topics related to making the board bootable. Only the
> MX28EVK revision D +has been tested.
> +
> +Terminology
> +-----------
> +
> +The dollar symbol ($) introduces a snipped of shell code. This shall be
> typed +into the unix command prompt in U-Boot source code root directory.
> +
> +The (=>) introduces a snipped of code that should by typed into U-Boot
> command +prompt.
> +
> +Contents
> +--------
> +
> +0) Files of the MX28EVK port
> +1) Prerequisites
> +2) Compiling U-Boot for MX28EVK
> +3) Installation of U-Boot for MX28EVK to SD card
> +
> +0) Files of the MX28EVK port
> +----------------------------
> +
> +arch/arm/cpu/arm926ejs/mx28/	- The CPU support code for the Freescale
> i.MX28 +arch/arm/include/asm/arch-mx28/	- Header files for the Freescale
> i.MX28 +board/denx/mx28evk/		- MX28EVK board specific files
> +include/configs/mx28evk.h	- MX28EVK configuration file
> +
> +1) Prerequisites
> +----------------
> +
> +To make the MX28EVK board bootable, some tools are necessary. The first
> one is +the "elftosb" tool distributed by Freescale Semiconductor. The
> other tool is the +"mxsboot" tool found in U-Boot source tree.
> +
> +Firstly, obtain the elftosb archive from the following location:
> +
> +	http://foss.doredevelopment.dk/mirrors/imx/elftosb-10.12.01.tar.gz
> +
> +We use a $VER variable here to denote the current version. At the time of
> +writing of this document, that is "10.12.01". To obtain the file from
> command +line, use:
> +
> +	$ VER="10.12.01"
> +	$ wget http://foss.doredevelopment.dk/mirrors/imx/elftosb-${VER}.tar.gz
> +
> +Extract the file:
> +
> +	$ tar xzf elftosb-${VER}.tar.gz
> +
> +Compile the file. We need to manually tell the linker to use also libm:
> +
> +	$ cd elftosb-${VER}/
> +	$ make LIBS="-lstdc++ -lm" elftosb
> +
> +Optionally, remove debugging symbols from elftosb:
> +
> +	$ strip bld/linux/elftosb
> +
> +Finally, install the "elftosb" binary. The "install" target is missing, so
> just +copy the binary by hand:
> +
> +	$ sudo cp bld/linux/elftosb /usr/local/bin/
> +
> +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.

This is copy-paste

> +
> +2) Compiling U-Boot for MX28
> +----------------------------
> +
> +Compiling the U-Boot for MX28 is straightforward and done as compiling
> U-Boot +for any other ARM device. For cross-compiler setup, please refer
> to ELDK5.0 +documentation. First, clean up the source code:
> +
> +	$ make mrproper
> +
> +Next, configure U-Boot for MX28EVK:
> +
> +	$ make mx28evk_config
> +
> +Lastly, compile U-Boot and prepare a "BootStream". The "BootStream" is a
> special +type of file, which the i.MX28 CPU can boot. This is handled by
> the following +command:
> +
> +	$ make u-boot.sb
> +
> +HINT: To speed-up the build process, you can add -j<N>, where N is number
> of +      compiler instances that'll run in parallel.
> +
> +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.
> +

Copy-paste

> +3) Installation of U-Boot for MX28EVK to SD card
> +------------------------------------------------
> +
> +To boot an MX28 from SD, set the boot mode DIP switches as:
> +
> +   * Boot Mode Select: 1 0 0 1 (Boot from SD card Slot 0 - U42)
> +   * JTAG PSWITCH RESET: To the left (reset enabled)
> +   * Battery Source: Down
> +   * Wall 5V: Up
> +   * VDD 5V: To the left (off)
> +   * Hold Button: Down (off)
> +
> +Full reference at i.MX28 manual chapter 12.2.1 (Table 12-2).
> +
> +An SD card that can be used to boot U-Boot on a i.MX28 CPU must contain a
> DOS +partition table, which in turn carries a partition of special type
> and which +contains a special header. The rest of partitions in the DOS
> partition table can +be used by the user.
> +
> +To prepare such partition, use your favourite partitioning tool. The
> partition +must have the following parameters:
> +
> +	* Start sector .......... sector 2048
> +	* Partition size ........ at least 1024 kb
> +	* Partition type ........ 0x53 (sometimes "OnTrack DM6 Aux3")
> +
> +For example in Linux fdisk, the sequence for a clear card follows. Be sure
> to +run fdisk with the option "-u=sectors" to set units to sectors:
> +
> +	* o ..................... create a clear partition table
> +	* n ..................... create new partition
> +		* p ............. primary partition
> +		* 1 ............. first partition
> +		* 2048 .......... first sector is 2048
> +		* +1M ........... make the partition 1Mb big
> +	* t 1 ................... change first partition ID
> +		* 53 ............ change the ID to 0x53 (OnTrack DM6 Aux3)
> +	* <create other partitions>
> +	* w ..................... write partition table to disk
> +
> +The partition layout is ready, next the special partition must be filled
> with +proper contents. The contents is generated by running the following
> command (see +chapter 2)):
> +
> +	$ ./tools/mxsboot sd u-boot.sb u-boot.sd
> +
> +The resulting file, "u-boot.sd", shall then be written to the partition.
> In this +case, we assume the first partition of the SD card is
> /dev/mmcblk0p1: +
> +	$ dd if=u-boot.sd of=/dev/mmcblk0p1
> +
> +Last step is to insert the card into MX28EVK and boot.
> +
> +NOTE: If the user needs to adjust the start sector, the "mxsboot" tool
> contains +      a "-p" switch for that purpose. The "-p" switch takes the
> sector number as +      an argument.

All of this seems like a copy-paste to me, sorry if I'm just being annoyed right 
now and dumbified by it. Please clear this to me as I'm uncertain about my 
reading skills now.