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. >> >> >> >> -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.