This adds necessary information on how to use U-boot on SPI NOR on MX28evk
Signed-off-by: Marten Wikman <marten.wik...@novia.fi>
---
board/freescale/mx28evk/README | 26 ++++++++++++++++++++++----
boards.cfg | 1 +
doc/README.mxs | 25 +++++++++++++++++++++++++
3 files changed, 48 insertions(+), 4 deletions(-)
diff --git a/board/freescale/mx28evk/README b/board/freescale/mx28evk/README
index 524f3fc..37e5d55 100644
--- a/board/freescale/mx28evk/README
+++ b/board/freescale/mx28evk/README
@@ -23,11 +23,19 @@ To boot MX28EVK from an SD card, set the boot mode
DIP switches as:
* VDD 5V: To the left (off)
* Hold Button: Down (off)
+
+To boot MX28EVK from SPI NOR flash, set the boot mode DIP switches as:
+ * Boot Mode Select: 0 0 1 0 (Boot from SSP2)
+ * 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:
+There are three targets for mx28evk:
"make mx28evk_config" - store enviroment variables into MMC
@@ -35,12 +43,22 @@ or
"make mx28evk_nand_config" - store enviroment variables into NAND flash
+or
+"make mx28evk_spi_config" - store enviroment variables into SPI NOR 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.
+48-pin TSOP flash device. SPI NOR flash is neither populated from the factory.
+It is possible to solder a SOIC memory on U49 or use a DIP8 on J89.
+To get SPI communication to work R320, R321,R322 and C178 has to be populated.
+Look in the schematics for component values.
+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.
+
+Follow the instructions from doc/README.mxs to generate a bootable SPI NOR
+memory.
+Make sure boot mode switches are correct, press POWER and U-boot will boot.
+
diff --git a/boards.cfg b/boards.cfg
index 944ed4c..b9ee7bd 100644
--- a/boards.cfg
+++ b/boards.cfg
@@ -203,6 +203,7 @@ mx23evk arm arm926ejs
mx23evk freesca
m28evk arm arm926ejs m28evk
denx mxs m28evk
mx28evk arm arm926ejs mx28evk
freescale mxs mx28evk:ENV_IS_IN_MMC
mx28evk_nand arm arm926ejs mx28evk
freescale mxs mx28evk:ENV_IS_IN_NAND
+mx28evk_spi arm arm926ejs mx28evk
freescale mxs mx28evk:ENV_IS_IN_SPI_FLASH
sc_sps_1 arm arm926ejs sc_sps_1
schulercontrol mxs
nhk8815 arm arm926ejs nhk8815
st nomadik
nhk8815_onenand arm arm926ejs nhk8815
st nomadik nhk8815:BOOT_ONENAND
diff --git a/doc/README.mxs b/doc/README.mxs
index 5d9e72f..8f03711 100644
--- a/doc/README.mxs
+++ b/doc/README.mxs
@@ -23,6 +23,7 @@ Contents
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
+5) Installation of U-boot into SPI NOR flash on a MX28 based board
1) Prerequisites
----------------
@@ -234,3 +235,27 @@ There are two possibilities when preparing an
image writable to NAND flash.
In case the user needs to boot a firmware image bigger than 1Mb, the
user has to adjust the "update_nand_firmware_maxsz" variable for the
update scripts to work properly.
+
+
+
+5) Installation of U-Boot to SPI NOR flash on a MX28 based board
+---------------------------------------------------------------
+
+To boot a MX28 based board from SPI NOR, set the boot mode DIP
switches according
+to MX28 manual section 12.2.1 (Table 12-2), SSP2
+
+The file u-boot.sb can be directly written to SPI NOR from U-boot prompt.
+
+Load u-boot to RAM, this can be done in several ways and one way is
to use tftp:
+ => tftp u-boot.sb 0x42000000
+
+Activate correct SPI NOR flash with:
+ => sf probe 2:0
+
+First the blocks where U-boot should be written to needs to be erased:
+ => sf erase 0x0 0x80000
+
+Write u-boot.sb to SPI NOR with:
+ => sf write 0x42000000 0 0x80000
+
+Last step is to power up board and U-boot should start.
--
1.8.3.2
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