Dear Fabio Estevam,
From: Fabio Estevam fabio.estevam@freescale.com
Provide instructions on how to build U-boot and flash the binary into an SD card for a mx23 based platform.
Can most of this not be shared with MX28 ?
Signed-off-by: Fabio Estevam fabio.estevam@freescale.com
doc/README.mx23_common | 145 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 145 insertions(+) create mode 100644 doc/README.mx23_common
diff --git a/doc/README.mx23_common b/doc/README.mx23_common new file mode 100644 index 0000000..dcf0ba4 --- /dev/null +++ b/doc/README.mx23_common @@ -0,0 +1,145 @@ +Booting U-boot on a MX23 processor +==================================
+This document describes the MX23 U-Boot port. This document mostly +covers topics related to making the module/board bootable.
+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 +--------
+1) Prerequisites +2) Compiling U-Boot for a MX23 based board +3) Installation of U-Boot for a MX23 based board to SD card
+1) Prerequisites +----------------
+To make a MX23 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.
+Firstly, obtain the elftosb archive from the following location:
- ftp://ftp.denx.de/pub/tools/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 ftp://ftp.denx.de/pub/tools/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.
+2) Compiling U-Boot for a MX23 based board +-------------------------------------------
+Compiling the U-Boot for a MX23 board 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 a MX23 based board
- $ make <mx23_based_board_name>_config
+Examples:
+1. For building U-boot for Freescale MX23EVK board:
- $ make mx23evk_config
+2. For building U-boot for Olimex MX23 Olinuxino board:
- $ make mx23_olinuxino_config
+Lastly, compile U-Boot and prepare a "BootStream". The "BootStream" is a special +type of file, which the i.MX23 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.
+3) Installation of U-Boot for a MX23 based board to SD card +-----------------------------------------------------------
+To boot a MX23 based board from a SD connected to SSP1 or SSP2, set the boot +mode DIP switches according to i.MX23 manual section 35.1.2 (Table 35-3). + +An SD card the i.MX23 CPU can use to boot U-Boot 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: +
- $ sudo dd if=u-boot.sd of=/dev/mmcblk0p1; sync
+Last step is to insert the card into MX23 based board 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.
Best regards, Marek Vasut