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@ossystems.com.br Acked-by: Fabio Estevam fabio.estevam@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:
+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-$%7BVER%7D.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.