|
|
|
|
@ -1,12 +1,15 @@ |
|
|
|
|
Booting U-boot on a MX28 processor |
|
|
|
|
================================== |
|
|
|
|
Booting U-boot on a MXS processor |
|
|
|
|
================================= |
|
|
|
|
|
|
|
|
|
This document describes the MX28 U-Boot port. This document mostly |
|
|
|
|
covers topics related to making the module/board bootable. |
|
|
|
|
This document describes the MXS U-Boot port. This document mostly covers topics |
|
|
|
|
related to making the module/board bootable. |
|
|
|
|
|
|
|
|
|
Terminology |
|
|
|
|
----------- |
|
|
|
|
|
|
|
|
|
The term "MXS" refers to a family of Freescale SoCs that is composed by MX23 |
|
|
|
|
and MX28. |
|
|
|
|
|
|
|
|
|
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. |
|
|
|
|
|
|
|
|
|
@ -17,16 +20,16 @@ Contents |
|
|
|
|
-------- |
|
|
|
|
|
|
|
|
|
1) Prerequisites |
|
|
|
|
2) Compiling U-Boot for a MX28 based board |
|
|
|
|
3) Installation of U-Boot for a MX28 based board to SD card |
|
|
|
|
4) Installation of U-Boot into NAND flash |
|
|
|
|
2) Compiling U-Boot for a MXS based board |
|
|
|
|
3) Installation of U-Boot for a MXS based board to SD card |
|
|
|
|
4) Installation of U-Boot into NAND flash on a MX28 based board |
|
|
|
|
|
|
|
|
|
1) Prerequisites |
|
|
|
|
---------------- |
|
|
|
|
|
|
|
|
|
To make a MX28 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 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: |
|
|
|
|
|
|
|
|
|
@ -60,18 +63,18 @@ 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. |
|
|
|
|
|
|
|
|
|
2) Compiling U-Boot for a MX28 based board |
|
|
|
|
2) Compiling U-Boot for a MXS based board |
|
|
|
|
------------------------------------------- |
|
|
|
|
|
|
|
|
|
Compiling the U-Boot for a MX28 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: |
|
|
|
|
Compiling the U-Boot for a MXS 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 MX28 based board |
|
|
|
|
Next, configure U-Boot for a MXS based board |
|
|
|
|
|
|
|
|
|
$ make <mx28_based_board_name>_config |
|
|
|
|
$ make <mxs_based_board_name>_config |
|
|
|
|
|
|
|
|
|
Examples: |
|
|
|
|
|
|
|
|
|
@ -83,8 +86,16 @@ Examples: |
|
|
|
|
|
|
|
|
|
$ make mx28evk_config |
|
|
|
|
|
|
|
|
|
3. For building U-boot for Freescale MX23EVK board: |
|
|
|
|
|
|
|
|
|
$ make mx23evk_config |
|
|
|
|
|
|
|
|
|
4. 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.MX28 CPU can boot. This is handled by the following |
|
|
|
|
type of file, which MXS CPUs can boot. This is handled by the following |
|
|
|
|
command: |
|
|
|
|
|
|
|
|
|
$ make u-boot.sb |
|
|
|
|
@ -96,18 +107,16 @@ 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 MX28 based board to SD card |
|
|
|
|
----------------------------------------------------------- |
|
|
|
|
|
|
|
|
|
To boot a MX28 based board from SD, set the boot mode DIP switches according |
|
|
|
|
to i.MX28 manual chapter 12.2.1 (Table 12-2), PORT=SSP0, SD/MMC master on |
|
|
|
|
SSP0, 3.3V. |
|
|
|
|
3) Installation of U-Boot for a MXS based board to SD card |
|
|
|
|
---------------------------------------------------------- |
|
|
|
|
|
|
|
|
|
To boot a MXS based board from SD, set the boot mode DIP switches according to |
|
|
|
|
to MX28 manual, section 12.2.1 (Table 12-2) or MX23 manual, section 35.1.2 |
|
|
|
|
(Table 35-3). |
|
|
|
|
|
|
|
|
|
An SD card the i.MX28 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. |
|
|
|
|
The SD card used 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: |
|
|
|
|
@ -141,17 +150,17 @@ 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 MX28 based board and boot. |
|
|
|
|
Last step is to insert the card into the MXS 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. |
|
|
|
|
|
|
|
|
|
4) Installation of U-Boot into NAND flash |
|
|
|
|
----------------------------------------- |
|
|
|
|
4) Installation of U-Boot into NAND flash on a MX28 based board |
|
|
|
|
--------------------------------------------------------------- |
|
|
|
|
|
|
|
|
|
To boot a MX28 based board from NAND, set the boot mode DIP switches according to i.MX28 |
|
|
|
|
manual chapter 12.2.1 (Table 12-2), PORT=GPMI, NAND 1.8 V. |
|
|
|
|
To boot a MX28 based board from NAND, set the boot mode DIP switches according |
|
|
|
|
to MX28 manual section 12.2.1 (Table 12-2), PORT=GPMI, NAND 1.8 V. |
|
|
|
|
|
|
|
|
|
There are two possibilities when preparing an image writable to NAND flash. |
|
|
|
|
|
|
|
|
|
@ -214,7 +223,7 @@ There are two possibilities when preparing an image writable to NAND flash. |
|
|
|
|
-------------------------------------------- |
|
|
|
|
There is a slight possibility of the user wanting to adjust the |
|
|
|
|
STRIDE and COUNT options of the NAND boot. For description of these, |
|
|
|
|
see i.MX28 manual section 12.12.1.2 and 12.12.1.3. |
|
|
|
|
see MX28 manual section 12.12.1.2 and 12.12.1.3. |
|
|
|
|
|
|
|
|
|
The update scripts take this possibility into account. In case the |
|
|
|
|
user changes STRIDE by blowing fuses, the user also has to change |
|
|
|
|
|
Albert ARIBAUD
12 years ago