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u-boot-brain/board/freescale/mx28evk
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Marek Vasut 7b8657e2bd ARM: mxs: Receive r0 and r1 passed from BootROM 
Make sure value in register r0 and r1 is preserved and passed to
the board_init_ll() and mxs_common_spl_init() where it can be
processed further. The value in r0 can be configured during the
BootStream generation to arbitary value, r1 contains pointer to
return value from CALL'd function.

This patch also clears the value in r0 before returning to BootROM
to make sure the BootROM is not confused by this value.

Finally, this patch cleans up some comments in the start.S file.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Fabio Estevam <fabio.estevam@freescale.com>
Cc: Stefano Babic <sbabic@denx.de>
2013-09-10 19:12:54 +02:00
..
iomux.c ARM: mxs: Receive r0 and r1 passed from BootROM 2013-09-10 19:12:54 +02:00
Makefile Add GPL-2.0+ SPDX-License-Identifier to source files 2013-07-24 09:44:38 -04:00
mx28evk.c Add GPL-2.0+ SPDX-License-Identifier to source files 2013-07-24 09:44:38 -04:00
README mx28evk: Move README file inside board directory 2013-06-26 17:40:39 +02:00

README 

FREESCALE MX28EVK
==================

Supported hardware: only MX28EVK rev D is supported in U-boot.

Files of the MX28EVK port
--------------------------

arch/arm/cpu/arm926ejs/mxs/	- The CPU support code for the Freescale i.MX28
arch/arm/include/asm/arch-mxs/	- Header files for the Freescale i.MX28
board/freescale/mx28evk/	- MX28EVK board specific files
include/configs/mx28evk.h	- MX28EVK configuration file

Jumper configuration
---------------------

To boot MX28EVK from an SD card, 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 right (reset disabled)
   * Battery Source: Down
   * Wall 5V: Up
   * VDD 5V: To the left (off)
   * Hold Button: Down (off)


Environment Storage
-------------------

There are two targets for mx28evk:

"make mx28evk_config"		- store enviroment variables into MMC

or

"make mx28evk_nand_config"	- store enviroment variables into NAND flash

Choose the target accordingly.

Note: The mx28evk board does not come with a NAND flash populated from the
factory. It comes with an empty slot (U23), which allows the insertion of a
48-pin TSOP flash device.

Follow the instructions from doc/README.mxs to generate a bootable SD card.

Insert the SD card in slot 0, power up the board and U-boot will boot.