Atmel AT91 Evaluation kits
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Index
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- I. Board mapping & boot media
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- II. NAND partition table
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- III. watchdog support
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I. Board mapping & boot media
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------------------------------------------------------------------------------
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AT91SAM9260EK, AT91SAM9G20EK & AT91SAM9XEEK
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------------------------------------------------------------------------------
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Memory map
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0x20000000 - 23FFFFFF SDRAM (64 MB)
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0xC0000000 - Cxxxxxxx Atmel Dataflash card (J13)
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0xD0000000 - D07FFFFF Soldered Atmel Dataflash (AT45DB642)
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Environment variables
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U-Boot environment variables can be stored at different places:
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- Dataflash on SPI chip select 1 (default)
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- Dataflash on SPI chip select 0 (dataflash card)
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- Nand flash.
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You can choose your storage location at config step (here for at91sam9260ek) :
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make at91sam9260ek_nandflash_config - use nand flash
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make at91sam9260ek_dataflash_cs0_config - use data flash (spi cs0)
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make at91sam9260ek_dataflash_cs1_config - use data flash (spi cs1)
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------------------------------------------------------------------------------
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AT91SAM9261EK, AT91SAM9G10EK
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------------------------------------------------------------------------------
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Memory map
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0x20000000 - 23FFFFFF SDRAM (64 MB)
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0xC0000000 - C07FFFFF Soldered Atmel Dataflash (AT45DB642)
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0xD0000000 - Dxxxxxxx Atmel Dataflash card (J22)
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Environment variables
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U-Boot environment variables can be stored at different places:
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- Dataflash on SPI chip select 0 (default)
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- Dataflash on SPI chip select 3 (dataflash card)
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- Nand flash.
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You can choose your storage location at config step (here for at91sam9260ek) :
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make at91sam9261ek_nandflash_config - use nand flash
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make at91sam9261ek_dataflash_cs0_config - use data flash (spi cs0)
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make at91sam9261ek_dataflash_cs3_config - use data flash (spi cs3)
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------------------------------------------------------------------------------
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AT91SAM9263EK
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------------------------------------------------------------------------------
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Memory map
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0x20000000 - 23FFFFFF SDRAM (64 MB)
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0xC0000000 - Cxxxxxxx Atmel Dataflash card (J9)
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Environment variables
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U-Boot environment variables can be stored at different places:
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- Dataflash on SPI chip select 0 (dataflash card)
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- Nand flash.
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- Nor flash (not populate by default)
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You can choose your storage location at config step (here for at91sam9260ek) :
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make at91sam9263ek_nandflash_config - use nand flash
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make at91sam9263ek_dataflash_cs0_config - use data flash (spi cs0)
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make at91sam9263ek_norflash_config - use nor flash
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You can choose to boot directly from U-Boot at config step
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make at91sam9263ek_norflash_boot_config - boot from nor flash
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------------------------------------------------------------------------------
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AT91SAM9M10G45EK
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------------------------------------------------------------------------------
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Memory map
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0x70000000 - 77FFFFFF SDRAM (128 MB)
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Environment variables
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U-Boot environment variables can be stored at different places:
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- Nand flash.
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You can choose your storage location at config step (here for at91sam9m10g45ek) :
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make at91sam9m10g45ek_nandflash_config - use nand flash
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------------------------------------------------------------------------------
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AT91SAM9RLEK
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------------------------------------------------------------------------------
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Memory map
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0x20000000 - 23FFFFFF SDRAM (64 MB)
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0xC0000000 - C07FFFFF Soldered Atmel Dataflash (AT45DB642)
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Environment variables
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U-Boot environment variables can be stored at different places:
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- Dataflash on SPI chip select 0
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- Nand flash.
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You can choose your storage location at config step (here for at91sam9rlek) :
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make at91sam9rlek_nandflash_config - use nand flash
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------------------------------------------------------------------------------
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AT91SAM9N12EK, AT91SAM9X5EK
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------------------------------------------------------------------------------
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Memory map
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0x20000000 - 27FFFFFF SDRAM (128 MB)
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Environment variables
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U-Boot environment variables can be stored at different places:
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- Nand flash.
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- SD/MMC card
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- Serialflash/Dataflash on SPI chip select 0
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You can choose your storage location at config step (here for at91sam9x5ek) :
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make at91sam9x5ek_dataflash_config - use data flash
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make at91sam9x5ek_mmc_config - use sd/mmc card
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make at91sam9x5ek_nandflash_config - use nand flash
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make at91sam9x5ek_spiflash_config - use serial flash
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------------------------------------------------------------------------------
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SAMA5D3XEK
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------------------------------------------------------------------------------
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Memory map
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0x20000000 - 3FFFFFFF SDRAM (512 MB)
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Environment variables
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U-Boot environment variables can be stored at different places:
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- Nand flash.
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- SD/MMC card
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- Serialflash on SPI chip select 0
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You can choose your storage location at config step (here for sama5d3xek) :
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make sama5d3xek_mmc_config - use SD/MMC card
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make sama5d3xek_nandflash_config - use nand flash
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make sama5d3xek_serialflash_config - use serial flash
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II. NAND partition table
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All the board support boot from NAND flash will use the following NAND
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partition table
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0x00000000 - 0x0003FFFF bootstrap (256 KiB)
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0x00040000 - 0x000BFFFF u-boot (512 KiB)
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0x000C0000 - 0x000FFFFF env (256 KiB)
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0x00100000 - 0x0013FFFF env_redundant (256 KiB)
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0x00140000 - 0x0017FFFF spare (256 KiB)
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0x00180000 - 0x001FFFFF dtb (512 KiB)
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0x00200000 - 0x007FFFFF kernel (6 MiB)
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0x00800000 - 0xxxxxxxxx rootfs (All left)
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III. Watchdog support
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For security reasons, the at91 watchdog is running at boot time and,
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if deactivated, cannot be used anymore.
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If you want to use the watchdog, you will need to keep it running in
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your code (make sure not to disable it in AT91Bootstrap for instance).
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In the U-Boot configuration, the AT91 watchdog support is enabled using
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the CONFIG_AT91SAM9_WATCHDOG and CONFIG_HW_WATCHDOG options.
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