On 03/12/2014 05:49 AM, 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[ 0] = ON (SYSBOOT[ 0]==0: NAND boot mode selected ) > SW2[ 1] = ON (SYSBOOT[ 1]==0: -- do -- ) > SW2[ 2] = OFF (SYSBOOT[ 2]==1: -- do -- ) > SW2[ 3] = OFF (SYSBOOT[ 3]==1: -- do -- ) > SW2[ 4] = ON (SYSBOOT[ 4]==0: -- do -- ) > SW2[ 8] = OFF (SYSBOOT[ 8]==1: 0:x8 device, 1:x16 device ) > SW2[ 9] = ON (SYSBOOT[ 9]==0: ECC done by ROM ) > SW2[10] = ON (SYSBOOT[10]==0: Non Muxed device ) > SW2[11] = 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 > > Signed-off-by: Pekon Gupta <pekon@xxxxxx> > --- > arch/arm/boot/dts/am335x-bone.dts | 123 ++++++++++++++++++++++++++++++++++++++ > 1 file changed, 123 insertions(+) > > diff --git a/arch/arm/boot/dts/am335x-bone.dts b/arch/arm/boot/dts/am335x-bone.dts > index 94ee427..be2c572 100644 > --- a/arch/arm/boot/dts/am335x-bone.dts > +++ b/arch/arm/boot/dts/am335x-bone.dts better to make a nand_cape dts which includes the am335x-bone.dts? > @@ -10,6 +10,36 @@ > #include "am33xx.dtsi" > #include "am335x-bone-common.dtsi" > > +&am33xx_pinmux { > + nand_flash_x16: nand_flash_x16 { > + pinctrl-single,pins = < > + 0x00 (MUX_MODE0 | PIN_INPUT) /* gpmc_ad0.gpmc_ad0 */ > + 0x04 (MUX_MODE0 | PIN_INPUT) /* gpmc_ad1.gpmc_ad1 */ > + 0x08 (MUX_MODE0 | PIN_INPUT) /* gpmc_ad2.gpmc_ad2 */ > + 0x0c (MUX_MODE0 | PIN_INPUT) /* gpmc_ad3.gpmc_ad3 */ > + 0x10 (MUX_MODE0 | PIN_INPUT) /* gpmc_ad4.gpmc_ad4 */ > + 0x14 (MUX_MODE0 | PIN_INPUT) /* gpmc_ad5.gpmc_ad5 */ > + 0x18 (MUX_MODE0 | PIN_INPUT) /* gpmc_ad6.gpmc_ad6 */ > + 0x1c (MUX_MODE0 | PIN_INPUT) /* gpmc_ad7.gpmc_ad7 */ > + 0x20 (MUX_MODE0 | PIN_INPUT) /* gpmc_ad8.gpmc_ad8 */ > + 0x24 (MUX_MODE0 | PIN_INPUT) /* gpmc_ad9.gpmc_ad9 */ > + 0x28 (MUX_MODE0 | PIN_INPUT) /* gpmc_ad10.gpmc_ad10 */ > + 0x2c (MUX_MODE0 | PIN_INPUT) /* gpmc_ad11.gpmc_ad11 */ > + 0x30 (MUX_MODE0 | PIN_INPUT) /* gpmc_ad12.gpmc_ad12 */ > + 0x34 (MUX_MODE0 | PIN_INPUT) /* gpmc_ad13.gpmc_ad13 */ > + 0x38 (MUX_MODE0 | PIN_INPUT) /* gpmc_ad14.gpmc_ad14 */ > + 0x3c (MUX_MODE0 | PIN_INPUT) /* gpmc_ad15.gpmc_ad15 */ > + 0x70 (MUX_MODE0 | PIN_INPUT_PULLUP ) /* gpmc_wait0.gpmc_wait0 */ > + 0x74 (MUX_MODE7 | PIN_OUTPUT_PULLUP) /* gpmc_wpn.gpio0_30 */ > + 0x7c (MUX_MODE0 | PIN_OUTPUT_PULLUP) /* gpmc_csn0.gpmc_csn0 */ > + 0x90 (MUX_MODE0 | PIN_OUTPUT) /* gpmc_advn_ale.gpmc_advn_ale */ > + 0x94 (MUX_MODE0 | PIN_OUTPUT) /* gpmc_oen_ren.gpmc_oen_ren */ > + 0x98 (MUX_MODE0 | PIN_OUTPUT) /* gpmc_wen.gpmc_wen */ > + 0x9c (MUX_MODE0 | PIN_OUTPUT) /* gpmc_be0n_cle.gpmc_be0n_cle */ > + >; > + }; > +}; > + > &ldo3_reg { > regulator-min-microvolt = <1800000>; > regulator-max-microvolt = <3300000>; > @@ -27,3 +57,96 @@ > &aes { > status = "okay"; > }; > + > +/* > + * uncomment following to enable NAND cape support > + * &mmc2 { > + * status = "disabled"; > + * }; > + * &elm { > + * status = "okay"; > + * }; > + * &gpmc { > + * status = "okay"; > + * }; > + */ > +&gpmc { > + pinctrl-names = "default"; > + pinctrl-0 = <&nand_flash_x16>; > + ranges = <0 0 0x08000000 0x10000000>; /* CS0: NAND */ > + nand@0,0 { > + reg = <0 0 0>; /* CS0, offset 0 */ > + ti,nand-ecc-opt = "bch8"; > + ti,elm-id = <&elm>; > + nand-bus-width = <16>; > + gpmc,device-width = <2>; > + gpmc,sync-clk-ps = <0>; > + gpmc,cs-on-ns = <0>; > + gpmc,cs-rd-off-ns = <80>; > + gpmc,cs-wr-off-ns = <80>; > + gpmc,adv-on-ns = <0>; > + gpmc,adv-rd-off-ns = <80>; > + gpmc,adv-wr-off-ns = <80>; > + gpmc,we-on-ns = <20>; > + gpmc,we-off-ns = <60>; > + gpmc,oe-on-ns = <20>; > + gpmc,oe-off-ns = <60>; > + gpmc,access-ns = <40>; > + gpmc,rd-cycle-ns = <80>; > + gpmc,wr-cycle-ns = <80>; > + gpmc,wait-on-read = "true"; > + gpmc,wait-on-write = "true"; > + gpmc,bus-turnaround-ns = <0>; > + gpmc,cycle2cycle-delay-ns = <0>; > + gpmc,clk-activation-ns = <0>; > + gpmc,wait-monitoring-ns = <0>; > + gpmc,wr-access-ns = <40>; > + gpmc,wr-data-mux-bus-ns = <0>; > + /* MTD partition table */ > + /* All SPL-* partitions are sized to minimal length > + * which can be independently programmable. For > + * NAND flash this is equal to size of erase-block */ > + #address-cells = <1>; > + #size-cells = <1>; > + partition@0 { > + label = "NAND.SPL"; > + reg = <0x00000000 0x00040000>; > + }; > + partition@1 { > + label = "NAND.SPL.backup1"; > + reg = <0x00040000 0x00040000>; > + }; > + partition@2 { > + label = "NAND.SPL.backup2"; > + reg = <0x00080000 0x00040000>; > + }; > + partition@3 { > + label = "NAND.SPL.backup3"; > + reg = <0x000C0000 0x00040000>; > + }; > + partition@4 { > + label = "NAND.u-boot-spl-os"; > + reg = <0x00100000 0x00080000>; > + }; > + partition@5 { > + label = "NAND.u-boot"; > + reg = <0x00180000 0x00100000>; > + }; > + partition@6 { > + label = "NAND.u-boot-env"; > + reg = <0x00280000 0x00040000>; > + }; > + partition@7 { > + label = "NAND.u-boot-env.backup1"; > + reg = <0x002C0000 0x00040000>; > + }; > + partition@8 { > + label = "NAND.kernel"; > + reg = <0x00300000 0x00700000>; > + }; > + partition@9 { > + label = "NAND.file-system"; > + reg = <0x00A00000 0x1F600000>; > + }; > + }; > +}; > -- Regards, Nishanth Menon -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
