I seems that what you are trying to do is to setup GPMC access on the
BeagleBone Black using kernel 3.12.x. The steps to do this are as follows:
(1) You must boot using an external micro SDHC card because the internal
eMMC must be disabled
(2) Disable eMMC and HDMI in uEnv.txt by adding
optargs=capemgr.disable_partno=BB-BONE-EMMC-2G,BB-BONELT-HDMI,BB-BONELT-HDMIN
(3) After booting cape manager will still load both capes. The must be
removed manually.
(4) In the sources of kernel 3.12.x we must modify
/arch/arm/boot/dts/am335x-boneblack.dts to free up the reset pin for the
eMMC device. This is done by changing status from "ok" to disabled in
section &mmc2
(5) It should now be possible to load your custom .dts file without any
warnings
Unfortunately, the GPMC is still not working in kernel 3.12. I have tested
this using 3.12.8 and 3.12.10. I cannot see any activity on the GPMC
signals. The same procedure is working in kernel 3.8.13.
Am Freitag, 17. Januar 2014 17:55:11 UTC+1 schrieb Drew Moore:
>
> Thanks for responding..
>
> I did
> grep clkout2 *.dts
> in both directories and found that clkout2 didn't show up in the 3.8 but
> did show up in 3.12
> in 3.12 it shows up in am335x-evm.dts and also am335x-evmsk.dts.. (and
> dove-cubox.dts but I don't think that is related)
>
> I also just noticed that it also shows up in am335x-bone-common.dtsi,
> (3.12) which now seems more likely to be the beaglebone related file.
>
> Here's that chunk from my device tree file..
>
> fragment@0 {
> target = <&am33xx_pinmux>;
> __overlay__ {
> gpmc_pins: pinmux_gpmc_pins {
> pinctrl-single,pins = <
> /* 0x20 = Fast, RX_enabled, pullup, pullup_enable,
> mode 0 */
> 0x000 0x20 /* gpmc_ad0.gpmc_ad0 MODE0 | INPUT |
> PULLUP */
> 0x004 0x20 /* gpmc_ad1.gpmc_ad1 MODE0 | INPUT |
> PULLUP */
> 0x008 0x20 /* gpmc_ad2.gpmc_ad2 MODE0 | INPUT |
> PULLUP */
> 0x00C 0x20 /* gpmc_ad3.gpmc_ad3 MODE0 | INPUT |
> PULLUP */
> 0x010 0x20 /* gpmc_ad4.gpmc_ad4 MODE0 | INPUT |
> PULLUP */
> 0x014 0x20 /* gpmc_ad5.gpmc_ad5 MODE0 | INPUT |
> PULLUP */
> 0x018 0x20 /* gpmc_ad6.gpmc_ad6 MODE0 | INPUT |
> PULLUP */
> 0x01C 0x20 /* gpmc_ad7.gpmc_ad7 MODE0 | INPUT |
> PULLUP */
> 0x020 0x20 /* gpmc_ad8.gpmc_ad8 MODE0 | INPUT |
> PULLUP */
> 0x024 0x20 /* gpmc_ad9.gpmc_ad9 MODE0 | INPUT |
> PULLUP */
> 0x028 0x20 /* gpmc_ad10.gpmc_ad10 MODE0 | INPUT |
> PULLUP */
> 0x02C 0x20 /* gpmc_ad11.gpmc_ad11 MODE0 | INPUT |
> PULLUP */
> 0x030 0x20 /* gpmc_ad12.gpmc_ad12 MODE0 | INPUT |
> PULLUP */
> 0x034 0x20 /* gpmc_ad13.gpmc_ad13 MODE0 | INPUT |
> PULLUP */
> 0x038 0x20 /* gpmc_ad14.gpmc_ad14 MODE0 | INPUT |
> PULLUP */
> 0x03C 0x20 /* gpmc_ad15.gpmc_ad15 MODE0 | INPUT |
> PULLUP */
>
> 0x078 0x04 /* gpmc_ben1.gpmc_dir MODE4 | OUTPUT */
> 0x080 0x00 /* gpmc_cscn1.gpmc_cscn1 MODE0 | OUTPUT
> */
> 0x08C 0x00 /* gpmc_clk.gpmc_clk MODE0 | OUTPUT */
> 0x090 0x00 /* gpmc_advn_ale.gpmc_advn_ale MODE0 |
> OUTPUT */
> 0x094 0x00 /* gpmc_oen_ren.gpmc_oen_ren MODE0 |
> OUTPUT */
> 0x098 0x00 /* gpmc_wen.gpmc_wen MODE0 | OUTPUT */
> 0x09C 0x00 /* gpmc_ben0_cle.gpmc_ben0_cle MODE0 |
> OUTPUT */
> 0x1b4 0x03 /* xdma_event_intr1.clkout2 MODE3 |
> OUTPUT */
> >;
> };
> };
> };
>
> I used BB-BONE-CAM3 as a starting point but yes, I'm mostly guessing at
> what this stuff means.
> My next guess is that the last line above is in the wrong section..
> clkout2 is not a gpmc pin.
>
> I don't have any /include/ lines in my file.. just
> compatible = "ti,beaglebone", "ti,beaglebone-black";
> from the CAM3 file I modified.
>
>
>
>
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