doc: board: Convert README.at91 to reST

Convert plain text documentation to reStructuredText format and add
it to Sphinx TOC tree. No essential content change.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>

3 files changed, 193 insertions, 174 deletions

diff --git a/doc/README.at91 b/doc/README.at91
deleted file mode 100644
index 39dd5632ba..0000000000
--- a/doc/README.at91
+++ /dev/null
@@ -1,174 +0,0 @@
-Atmel AT91 Evaluation kits
-
-Index
-  - I. Board mapping & boot media
-  - II. NAND partition table
-  - III. watchdog support
-
-I. Board mapping & boot media
-------------------------------------------------------------------------------
-AT91SAM9260EK, AT91SAM9G20EK & AT91SAM9XEEK
-------------------------------------------------------------------------------
-
-Memory map
-	0x20000000 - 23FFFFFF	SDRAM (64 MB)
-	0xC0000000 - Cxxxxxxx	Atmel Dataflash card (J13)
-	0xD0000000 - D07FFFFF	Soldered Atmel Dataflash (AT45DB642)
-
-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_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, AT91SAM9G10EK
-------------------------------------------------------------------------------
-
-Memory map
-	0x20000000 - 23FFFFFF	SDRAM (64 MB)
-	0xC0000000 - C07FFFFF	Soldered Atmel Dataflash (AT45DB642)
-	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_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.
-		- Nor flash (not populate by default)
-
-	You can choose your storage location at config step (here for at91sam9260ek) :
-		make at91sam9263ek_nandflash_config	- use nand flash
-		make at91sam9263ek_dataflash_cs0_config	- use data flash (spi cs0)
-		make at91sam9263ek_norflash_config	- use nor flash
-
-	You can choose to boot directly from U-Boot at config step
-		make at91sam9263ek_norflash_boot_config	- boot from nor flash
-
-
-------------------------------------------------------------------------------
-AT91SAM9M10G45EK
-------------------------------------------------------------------------------
-
-Memory map
-	0x70000000 - 77FFFFFF	SDRAM (128 MB)
-
-Environment variables
-
-	U-Boot environment variables can be stored at different places:
-		- Nand flash.
-
-	You can choose your storage location at config step (here for at91sam9m10g45ek) :
-		make at91sam9m10g45ek_nandflash_config		- use nand flash
-
-
-------------------------------------------------------------------------------
-AT91SAM9RLEK
-------------------------------------------------------------------------------
-
-Memory map
-	0x20000000 - 23FFFFFF	SDRAM (64 MB)
-	0xC0000000 - C07FFFFF   Soldered Atmel Dataflash (AT45DB642)
-
-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 at91sam9rlek) :
-		make at91sam9rlek_nandflash_config	- use nand flash
-
-
-------------------------------------------------------------------------------
-AT91SAM9N12EK, AT91SAM9X5EK
-------------------------------------------------------------------------------
-
-Memory map
-	0x20000000 - 27FFFFFF	SDRAM (128 MB)
-
-Environment variables
-
-	U-Boot environment variables can be stored at different places:
-		- Nand flash.
-		- SD/MMC card
-		- Serialflash/Dataflash on SPI chip select 0
-
-	You can choose your storage location at config step (here for at91sam9x5ek) :
-		make at91sam9x5ek_dataflash_config	- use data flash
-		make at91sam9x5ek_mmc_config		- use sd/mmc card
-		make at91sam9x5ek_nandflash_config	- use nand flash
-		make at91sam9x5ek_spiflash_config	- use serial flash
-
-
-------------------------------------------------------------------------------
-SAMA5D3XEK
-------------------------------------------------------------------------------
-
-Memory map
-	0x20000000 - 3FFFFFFF	SDRAM (512 MB)
-
-Environment variables
-
-	U-Boot environment variables can be stored at different places:
-		- Nand flash.
-		- SD/MMC card
-		- Serialflash on SPI chip select 0
-
-	You can choose your storage location at config step (here for sama5d3xek) :
-		make sama5d3xek_mmc_config		- use SD/MMC card
-		make sama5d3xek_nandflash_config	- use nand flash
-		make sama5d3xek_serialflash_config	- use serial flash
-
-
-II. NAND partition table
-
-	All the board support boot from NAND flash will use the following NAND
-	partition table
-
-		0x00000000 - 0x0003FFFF	bootstrap	(256 KiB)
-		0x00040000 - 0x000BFFFF u-boot		(512 KiB)
-		0x000C0000 - 0x000FFFFF env		(256 KiB)
-		0x00100000 - 0x0013FFFF env_redundant	(256 KiB)
-		0x00140000 - 0x0017FFFF spare		(256 KiB)
-		0x00180000 - 0x001FFFFF dtb		(512 KiB)
-		0x00200000 - 0x007FFFFF kernel		(6 MiB)
-		0x00800000 - 0xxxxxxxxx rootfs		(All left)
-
-III. Watchdog support
-
-	For security reasons, the at91 watchdog is running at boot time and,
-	if deactivated, cannot be used anymore.
-	If you want to use the watchdog, you will need to keep it running in
-	your code (make sure not to disable it in AT91Bootstrap for instance).
-
-	In the U-Boot configuration, the AT91 watchdog support is enabled using
-	the CONFIG_WDT and CONFIG_WDT_AT91 options.
diff --git a/doc/board/atmel/at91ek.rst b/doc/board/atmel/at91ek.rst
new file mode 100644
index 0000000000..6185b1dfb2
--- /dev/null
+++ b/doc/board/atmel/at91ek.rst
@@ -0,0 +1,192 @@
+.. SPDX-License-Identifier: GPL-2.0+
+
+AT91 Evaluation kits
+====================
+
+Board mapping & boot media
+--------------------------
+
+AT91SAM9260EK, AT91SAM9G20EK & AT91SAM9XEEK
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+Memory map::
+
+	0x20000000 - 23FFFFFF	SDRAM (64 MB)
+	0xC0000000 - Cxxxxxxx	Atmel Dataflash card (J13)
+	0xD0000000 - D07FFFFF	Soldered Atmel Dataflash (AT45DB642)
+
+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_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, AT91SAM9G10EK
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+Memory map::
+
+	0x20000000 - 23FFFFFF	SDRAM (64 MB)
+	0xC0000000 - C07FFFFF	Soldered Atmel Dataflash (AT45DB642)
+	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_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
+	- Nor flash (not populate by default)
+
+You can choose your storage location at config step (here for at91sam9260ek)::
+
+	make at91sam9263ek_nandflash_config	- use nand flash
+	make at91sam9263ek_dataflash_cs0_config	- use data flash (spi cs0)
+	make at91sam9263ek_norflash_config	- use nor flash
+
+You can choose to boot directly from U-Boot at config step::
+
+	make at91sam9263ek_norflash_boot_config	- boot from nor flash
+
+
+AT91SAM9M10G45EK
+^^^^^^^^^^^^^^^^
+
+Memory map::
+
+	0x70000000 - 77FFFFFF	SDRAM (128 MB)
+
+Environment variables
+
+U-Boot environment variables can be stored at different places:
+
+	- Nand flash
+
+You can choose your storage location at config step (here for at91sam9m10g45ek)::
+
+	make at91sam9m10g45ek_nandflash_config		- use nand flash
+
+
+AT91SAM9RLEK
+^^^^^^^^^^^^
+
+Memory map::
+
+	0x20000000 - 23FFFFFF	SDRAM (64 MB)
+	0xC0000000 - C07FFFFF   Soldered Atmel Dataflash (AT45DB642)
+
+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 at91sam9rlek)::
+
+	make at91sam9rlek_nandflash_config	- use nand flash
+
+
+AT91SAM9N12EK, AT91SAM9X5EK
+^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+Memory map::
+
+	0x20000000 - 27FFFFFF	SDRAM (128 MB)
+
+Environment variables
+
+U-Boot environment variables can be stored at different places:
+
+	- Nand flash
+	- SD/MMC card
+	- Serialflash/Dataflash on SPI chip select 0
+
+You can choose your storage location at config step (here for at91sam9x5ek)::
+
+	make at91sam9x5ek_dataflash_config	- use data flash
+	make at91sam9x5ek_mmc_config		- use sd/mmc card
+	make at91sam9x5ek_nandflash_config	- use nand flash
+	make at91sam9x5ek_spiflash_config	- use serial flash
+
+
+SAMA5D3XEK
+^^^^^^^^^^
+
+Memory map::
+
+	0x20000000 - 3FFFFFFF	SDRAM (512 MB)
+
+Environment variables
+
+U-Boot environment variables can be stored at different places:
+
+	- Nand flash
+	- SD/MMC card
+	- Serialflash on SPI chip select 0
+
+You can choose your storage location at config step (here for sama5d3xek)::
+
+	make sama5d3xek_mmc_config		- use SD/MMC card
+	make sama5d3xek_nandflash_config	- use nand flash
+	make sama5d3xek_serialflash_config	- use serial flash
+
+
+NAND partition table
+--------------------
+
+All the board support boot from NAND flash will use the following NAND
+partition table::
+
+	0x00000000 - 0x0003FFFF	bootstrap	(256 KiB)
+	0x00040000 - 0x000BFFFF u-boot		(512 KiB)
+	0x000C0000 - 0x000FFFFF env		(256 KiB)
+	0x00100000 - 0x0013FFFF env_redundant	(256 KiB)
+	0x00140000 - 0x0017FFFF spare		(256 KiB)
+	0x00180000 - 0x001FFFFF dtb		(512 KiB)
+	0x00200000 - 0x007FFFFF kernel		(6 MiB)
+	0x00800000 - 0xxxxxxxxx rootfs		(All left)
+
+
+Watchdog support
+----------------
+
+For security reasons, the at91 watchdog is running at boot time and,
+if deactivated, cannot be used anymore.
+If you want to use the watchdog, you will need to keep it running in
+your code (make sure not to disable it in AT91Bootstrap for instance).
+
+In the U-Boot configuration, the AT91 watchdog support is enabled using
+the CONFIG_WDT and CONFIG_WDT_AT91 options.
diff --git a/doc/board/index.rst b/doc/board/index.rst
index 339a2a1f0b..b2f83b6d9a 100644
--- a/doc/board/index.rst
+++ b/doc/board/index.rst
@@ -7,6 +7,7 @@ Board-specific doc
    :maxdepth: 2
 
    AndesTech/index
+   atmel/index
    coreboot/index
    emulation/index
    google/index