Is there really nobody interested in using the GPMC on the BeagleBone Black?
Am Dienstag, 18. Februar 2014 11:35:06 UTC+1 schrieb quik...@gmail.com:
>
> 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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