[PATCH v1 1/3] ARM: dts: am335x-bone: add support for beaglebone NAND cape

[Gupta, Pekon]

>From: Ezequiel Garcia [mailto:ezequiel at vanguardiasur.com.ar]
>>On 24 Jun 05:54 PM, Pekon Gupta wrote:
>> +&gpmc {
>> +	ranges = <0 0 0 0x01000000>;	/* address range = 16MB (minimum GPMC partition) */
>> +	nand at 0,0 {
>> +		status = "disabled";
>> +		reg = <0 0 4>;		/* device IO registers */
>> +		pinctrl-names = "default";
>> +		pinctrl-0 = <&bbcape_nand_flash_pins>;
>> +		ti,nand-ecc-opt = "bch8";
>> +		ti,elm-id = <&elm>;
>
>Don't you need something like this to turn on the elm device?
>
>&elm {
>	status = "okay";
>};
>
No, This was the intend of these patches to keep cape DTS as "disabled"
so that:
(1)These patches should not change the behavior of existing DTS
 (am335x-boneblack.dts or am335x-bone.dts), or conflict with
 any existing node or other cape DTS.
(2) In-case of share-pin mux where multiple capes use same pins
Cape DTS should not conflict each other.

Now, to enable the choice of cape without hacking any source file,
user can use u-boot commands (refer to example in cover-letter):
/* load DTB */
u-boot> tftp 0x81000000 am335x-boneblack.dtb
u-boot> fdt addr 0x81000000
/* disabled conflicting MMC2 (eMMC) */
u-boot> fdt set  /ocp/mmc at 481d8000 status \d\i\s\a\b\l\e\d
/* enable NAND cape*/
u-boot> fdt set  /ocp/elm status \o\k\a\y
u-boot> fdt set  /ocp/gpmc status \o\k\a\y
u-boot> fdt set  /ocp/gpmc/nand status \o\k\a\y

And then boot using this DTB loaded at 0x81000000
(you can put all these commands in uEnv as part of $bootcmd)


with regards, Pekon