* Gupta, Pekon <pekon@xxxxxx> [140622 22:42]: > Hi Tony, > > Just reviving this thread for some information.. > > >From: Tony Lindgren [mailto:tony@xxxxxxxxxxx] > >Sent: Monday, May 19, 2014 9:56 PM > >To: Gupta, Pekon > >Cc: linux-omap; Ezequiel Garcia; Stefan Roese; Javier Martinez Canillas; Quadros, Roger > >Subject: Re: [PATCH v7 1/4] ARM: dts: am335x-bone: add support for beaglebone NAND cape > > > >* Pekon Gupta <pekon@xxxxxx> [140519 02:16]: > >> --- a/arch/arm/boot/dts/am335x-bone.dts > >> +++ b/arch/arm/boot/dts/am335x-bone.dts > >> @@ -9,6 +9,7 @@ > >> > >> #include "am33xx.dtsi" > >> #include "am335x-bone-common.dtsi" > >> +#include "am335x-bone-memory-cape.dts" > >> > >> &ldo3_reg { > >> regulator-min-microvolt = <1800000>; > >> --- a/arch/arm/boot/dts/am335x-boneblack.dts > >> +++ b/arch/arm/boot/dts/am335x-boneblack.dts > >> @@ -9,6 +9,7 @@ > >> > >> #include "am33xx.dtsi" > >> #include "am335x-bone-common.dtsi" > >> +#include "am335x-bone-memory-cape.dts" > >> > >> &ldo3_reg { > >> regulator-min-microvolt = <1800000>; > > > >Based on the recent discussions on the capes, it seems that nobody > >wants to implement toggling of the capes in u-boot. And as there > >can be other capes using GPMC bus, we can't merge this. > > I have been able to get toggling of capes (enabling and disabling of DT nodes) > in u-boot. It was already there in u-boot mainline [1], may be no-body tried it. > > Example: Below sequence works for NAND cape patch mentioned in this thread. > --------------- > /* load DTB */ > u-boot> tftp 0x81000000 am335x-boneblack.dtb > u-boot> fdt addr 0x81000000 > /* disable MMC2 node */ > u-boot> fdt list /ocp/mmc@481d8000 > u-boot> fdt set /ocp/mmc@481d8000 status \d\i\s\a\b\l\e\d > u-boot> fdt list /ocp/mmc@481d8000 status > /* enable GPMC node */ > u-boot> fdt list /ocp/gpmc > u-boot> fdt set /ocp/gpmc status \o\k\a\y > u-boot> fdt list /ocp/gpmc status > /* enable ELM node */ > u-boot> fdt list /ocp/elm > u-boot> fdt set /ocp/elm status \o\k\a\y > u-boot> fdt list /ocp/elm status > /* boot uImage */ > tftp 0x82000000 uImage > bootm 0x82000000 - 0x81000000 > > Note: "fdt set" command does not accept string literals > as binding values, it internally converts them to string, so > escape sequenced characters were used here.. > "okay" == \o\k\a\y > "disabled" == \d\i\s\a\b\l\e\d" Cool. Now all we need is a few helper functions in u-boot so it can be done a bit easier :) Regards, Tony -- 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
