at91: Choose environment variables location within make config target

This patch adds the possiblity to choose the media where the environment will
be located. This allow to choose this fundamental configuration without editing
config files.

Documentation file added.

Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Acked-by: Stelian Pop <stelian@popies.net>
Acked-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>

1 files changed, 88 insertions, 0 deletions

diff --git a/doc/README.at91 b/doc/README.at91
new file mode 100644
index 0000000000..838769a908
--- /dev/null
+++ b/doc/README.at91
@@ -0,0 +1,88 @@
+Atmel AT91 Evaluation kits
+
+http://atmel.com/dyn/products/tools.asp?family_id=605#1443
+
+------------------------------------------------------------------------------
+AT91SAM9260EK
+------------------------------------------------------------------------------
+
+Memory map
+	0x20000000 - 23FFFFFF	SDRAM (64 MB)
+	0xC0000000 - Cxxxxxxx	Atmel Dataflash card (J13)
+	0xD0000000 - Dxxxxxxx	Soldered Atmel Dataflash
+
+Environment variables
+
+	U-Boot environment variables can be stored at different places:
+		- Dataflash on SPI chip select 1 (default)
+		- Dataflash on SPI chip select 0 (dataflash card)
+		- Nand flash.
+
+	You can choose your storage location at config step (here for at91sam9260ek) :
+		make at91sam9260ek_config		- use data flash (spi cs1) (default)
+		make at91sam9260ek_nandflash_config	- use nand flash
+		make at91sam9260ek_dataflash_cs0_config	- use data flash (spi cs0)
+		make at91sam9260ek_dataflash_cs1_config	- use data flash (spi cs1)
+
+
+------------------------------------------------------------------------------
+AT91SAM9261EK
+------------------------------------------------------------------------------
+
+Memory map
+	0x20000000 - 23FFFFFF	SDRAM (64 MB)
+	0xC0000000 - Cxxxxxxx	Soldered Atmel Dataflash
+	0xD0000000 - Dxxxxxxx	Atmel Dataflash card (J22)
+
+Environment variables
+
+	U-Boot environment variables can be stored at different places:
+		- Dataflash on SPI chip select 0 (default)
+		- Dataflash on SPI chip select 3 (dataflash card)
+		- Nand flash.
+
+	You can choose your storage location at config step (here for at91sam9260ek) :
+		make at91sam9261ek_config		- use data flash (spi cs0) (default)
+		make at91sam9261ek_nandflash_config	- use nand flash
+		make at91sam9261ek_dataflash_cs0_config	- use data flash (spi cs0)
+		make at91sam9261ek_dataflash_cs3_config	- use data flash (spi cs3)
+
+
+------------------------------------------------------------------------------
+AT91SAM9263EK
+------------------------------------------------------------------------------
+
+Memory map
+	0x20000000 - 23FFFFFF	SDRAM (64 MB)
+	0xC0000000 - Cxxxxxxx	Atmel Dataflash card (J9)
+
+Environment variables
+
+	U-Boot environment variables can be stored at different places:
+		- Dataflash on SPI chip select 0 (dataflash card)
+		- Nand flash.
+
+	You can choose your storage location at config step (here for at91sam9260ek) :
+		make at91sam9263ek_config		- use data flash (spi cs0) (default)
+		make at91sam9263ek_nandflash_config	- use nand flash
+		make at91sam9263ek_dataflash_cs0_config	- use data flash (spi cs0)
+
+
+------------------------------------------------------------------------------
+AT91SAM9RLEK
+------------------------------------------------------------------------------
+
+Memory map
+	0x20000000 - 23FFFFFF	SDRAM (64 MB)
+	0xC0000000 - Cxxxxxxx	Soldered Atmel Dataflash
+
+Environment variables
+
+	U-Boot environment variables can be stored at different places:
+		- Dataflash on SPI chip select 0
+		- Nand flash.
+
+	You can choose your storage location at config step (here for at91sam9260ek) :
+		make at91sam9263ek_config		- use data flash (spi cs0) (default)
+		make at91sam9263ek_nandflash_config	- use nand flash
+		make at91sam9263ek_dataflash_cs0_config	- use data flash (spi cs0)