[U-Boot] [U-Boot, v2, 2/6] board/ti/am335x: add support for beaglebone NAND cape

[Tom Rini]

On Tue, Jul 22, 2014 at 04:03:20PM +0530, pekon gupta wrote:

> Beaglebone Board can be connected to expansion boards to add devices to them.
> These expansion boards are called 'capes'. This patch adds support for
> following versions of Beaglebone(AM335x) NAND capes
> (a) NAND Device with bus-width=16, block-size=128k, page-size=2k, oob-size=64
> (b) NAND Device with bus-width=16, block-size=256k, page-size=4k, oob-size=224
> Further information and datasheets can be found at [1] and [2]
> 
> * How to boot from NAND using Memory Expander + NAND Cape ? *
>  - Important: As BOOTSEL values are sampled only at POR, so after changing any
>    setting on SW2 (DIP switch), disconnect and reconnect all board power supply
>    (including mini-USB console port) to POR the beaglebone.
> 
>  - Selection of ECC scheme
>   for NAND cape(a), ROM code expects BCH8_HW ecc-scheme
>   for NAND cape(b), ROM code expects BCH16_HW ecc-scheme
> 
>  - Selction of boot modes can be controlled via  DIP switch(SW2) present on
>    Memory Expander cape.
>    SW2[SWITCH_BOOT] == OFF  follow default boot order  MMC-> SPI -> UART -> USB
>    SW2[SWITCH_BOOT] == ON   boot mode selected via DIP switch(SW2)
>    So to flash NAND, first boot via MMC or other sources and then switch to
>    SW2[SWITCH_BOOT]=ON to boot from NAND Cape.
> 
>  - For NAND boot following switch settings need to be followed
>    SW2[ 1] = OFF  (SYSBOOT[ 0]==1: NAND boot mode selected )
>    SW2[ 2] = OFF  (SYSBOOT[ 1]==1:       -- do --          )
>    SW2[ 3] = ON   (SYSBOOT[ 2]==0:       -- do --          )
>    SW2[ 4] = ON   (SYSBOOT[ 3]==0:       -- do --          )
>    SW2[ 5] = OFF  (SYSBOOT[ 4]==1:       -- do --          )
>    SW2[ 6] = OFF  (SYSBOOT[ 8]==1: 0:x8 device, 1:x16 device )
>    SW2[ 7] = ON   (SYSBOOT[ 9]==0: ECC done by ROM  )
>    SW2[ 8] = ON   (SYSBOOT[10]==0: Non Muxed device )
>    SW2[ 9] = ON   (SYSBOOT[11]==0:    -- do --      )
> 
> [1] http://beagleboardtoys.info/index.php?title=BeagleBone_Memory_Expansion
> [2] http://beagleboardtoys.info/index.php?title=BeagleBone_4Gb_16-Bit_NAND_Module
> 
> *IMPORTANT NOTE*
> As Beaglebone board shares the same config as AM335x EVM, so following
> changes are required in addition to this patch for Beaglebone NAND cape.
> (1) Enable NAND in am335x_beaglebone board profile
> (2) Add CONFIG_SYS_NAND_BUSWIDTH_16BIT to board config because:
>  -  AM335x EVM has NAND device with datawidth=8, whereas
>  -  Beaglebone NAND cape has NAND device with data-width=16
> 
> diff --git a/boards.cfg b/boards.cfg
> -Active  arm         armv7          am33xx      ti              am335x              am335x_boneblack                      am335x_evm:SERIAL1,CONS_INDEX=1,EMMC_BOOT                                                                                         Tom Rini <trini at ti.com>
> +Active  arm         armv7          am33xx      ti              am335x              am335x_boneblack                      am335x_evm:SERIAL1,CONS_INDEX=1,NAND                                                                                              Tom Rini <trini at ti.com>
> 
> diff --git a/include/configs/am335x_evm.h b/include/configs/am335x_evm.h
> +#define CONFIG_SYS_NAND_BUSWIDTH_16BIT
> 
> Signed-off-by: Pekon Gupta <pekon at ti.com>

Applied to u-boot-ti/master, thanks!

-- 
Tom
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: application/pgp-signature
Size: 836 bytes
Desc: Digital signature
URL: <http://lists.denx.de/pipermail/u-boot/attachments/20140825/e7a432d7/attachment.pgp>