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authorFabio Estevam <fabio.estevam@freescale.com>2014-06-10 00:03:59 -0300
committerStefano Babic <sbabic@denx.de>2014-06-17 16:39:10 +0200
commita81c90f4c8a7e77a0a6bf4b7288bf32f15d923a2 (patch)
tree25a406f052d1de5d0812f80193323f6685d0b8a2 /board/freescale/mx28evk
parentd4c8258812ace8991faf6f66fb6d81f4546a749f (diff)
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mx28evk: Add documentation on how to boot from SPI NOR
Explain the necessary steps in order to boot from SPI NOR. Based on a earlier submission from Mårten Wikman. Signed-off-by: Mårten Wikman <marten.wikman@novia.fi> Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
Diffstat (limited to 'board/freescale/mx28evk')
-rw-r--r--board/freescale/mx28evk/README22
1 files changed, 19 insertions, 3 deletions
diff --git a/board/freescale/mx28evk/README b/board/freescale/mx28evk/README
index 0389a1d..958ebc6 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 environment variables into MMC
@@ -35,12 +43,20 @@ or
"make mx28evk_nand_config" - store environment 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.
+mx28evk does not come with SPI NOR flash populated from the factory either.
+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 need to be populated.
+Look in the schematics for the proper component values.
-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 SD card or
+to generate a binary to be flashed into SPI NOR.