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authorpekon gupta <pekon@ti.com>2014-07-22 16:03:22 +0530
committerTom Rini <trini@ti.com>2014-08-25 10:48:12 -0400
commite53ad4b445464327aebd1c5ea6260b7bb9b80ae7 (patch)
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parent3df3bc1e1dc4c38de93d66fb589565f36d9749c7 (diff)
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board/ti/am43xx: add support for parallel NAND
This patch adds support for NAND device connected to GPMC chip-select on following AM43xx EVM boards. am437x-gp-evm: On this board, NAND Flash signals are muxed with eMMC, thus at a time either eMMC or NAND can be enabled. Selection between eMMC and NAND is controlled by: (a) Statically using Jumper on connecter (J89) present on board. (a) If Jumper on J89 is NOT used, then selection can be dynamically controlled by driving SPI2_CS0[MUX_MODE=GPIO] pin via software: SPI2_CS0 == 0: NAND (default) SPI2_CS0 == 1: eMMC am43x-epos-evm: On this board, NAND Flash control lines are muxed with QSPI, Thus only one of the two can be used at a time. Selection is controlled by: (a) Dynamically driving following GPIO pin from software GPMC_A0(GPIO) == 0 NAND is selected (default) NAND device (MT29F4G08AB) on these boards has: - data-width=8bits - blocksize=256KB - pagesize=4KB - oobsize=224 bytes For above NAND device, ROM code expects the boot-loader to be flashed in BCH16 ECC scheme for NAND boot, So by default BCH16 ECC is enabled for AM43xx EVMs. Signed-off-by: Pekon Gupta <pekon@ti.com>
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