TFT device tree help
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anthony.d...@gmail.com
Jan 12, 2018, 9:14:27 AM1/12/18
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Hi all!
Produces this in dmesg
I guess that makes sense, the gpios are being used by the 'enable_uboot_cape_universal=1' in /boot/uEnv.txt. Not sure that statement even makes sense. I'm guessing I need an dts overlay to set the reset and dc pins to be used with the display.
Then I tried the dts in the second gist. There are two and I have no idea which is needed. The README.md provided a command to compile so I'll go with that.
That seems to work. Things seem to be correct for my display in that dts file. Next I edit /boot/uEnv.txt and set this:
I'm not sure if that is correct and can't find any docs on where uboot expects files to be. Seems like it could go on any of these lines:
Some guidance on the uEnv.txt would be very helpful.
Can anyone point out what I'm doing wrong? I'd love to get this screen working. Thanks for your time!
I'm hoping someone can point me in the right direction here. I haven't been able to find noob-friendly docs on using device tree overlays. Most of the docs for bbb refer to the capemanager which I now know is no longer used.
I'd like to get this TFT display working with the pocketbeagle using fbtft. I wasn't able to get either of these examples working:
I hooked everything up except the buttons as in the first link.
Loading the fbtft module:
sudo rmmod fbtft_device fb_ili9341 fbtftsudo modprobe fbtft_device name=adafruit28 busnum=2 cs=1 rotate=90 gpios=dc:45,reset:86[ 195.378472] fbtft: module is from the staging directory, the quality is unknown, you have been warned.[ 195.394949] fbtft_device: module is from the staging directory, the quality is unknown, you have been warned.[ 195.398240] spidev spi1.0: spidev spi1.0 24000kHz 8 bits mode=0x00[ 195.398267] spidev spi2.0: spidev spi2.0 24000kHz 8 bits mode=0x00[ 195.398280] spidev spi2.1: spidev spi2.1 24000kHz 8 bits mode=0x00[ 195.398504] spidev spi2.1: Deleting spi2.1[ 195.399531] fbtft_device: GPIOS used by 'adafruit28':[ 195.399546] fbtft_device: 'reset' = GPIO86[ 195.399554] fbtft_device: 'dc' = GPIO45[ 195.399568] spidev spi1.0: spidev spi1.0 24000kHz 8 bits mode=0x00[ 195.399580] spidev spi2.0: spidev spi2.0 24000kHz 8 bits mode=0x00[ 195.399591] spi spi2.1: fb_ili9341 spi2.1 32000kHz 8 bits mode=0x00[ 195.447747] fb_ili9341: module is from the staging directory, the quality is unknown, you have been warned.[ 195.454803] fb_ili9341 spi2.1: fbtft_request_gpios: gpio_request_one('reset'=86) failed with -16[ 195.463981] fb_ili9341: probe of spi2.1 failed with error -16
I tried compiling the dts in the first gist (without modification) without success:
$ cd ~$ dtc -W no-unit_address_vs_reg -@ -I dts -O dtb -o /lib/firmware/am335x-pocketbeagle-simplegaming.dtbo am335x-pocketbeagle-simplegaming.dtsError: am335x-pocketbeagle-simplegaming.dts:3.1-9 syntax errorFATAL ERROR: Unable to parse input tree
Then I tried the dts in the second gist. There are two and I have no idea which is needed. The README.md provided a command to compile so I'll go with that.
$ cd ~
$ sudo dtc -W no-unit_address_vs_reg -@ -I dts -O dtb -o /lib/firmware/am335x-spilcd-adafruit28.dtbo am335x-spilcd-adafruit28.dtsThat seems to work. Things seem to be correct for my display in that dts file. Next I edit /boot/uEnv.txt and set this:
###Custom Capedtb_overlay=/lib/firmware/am335x-spilcd-adafruit28.dtboI'm not sure if that is correct and can't find any docs on where uboot expects files to be. Seems like it could go on any of these lines:
###Overide capes with eeprom#uboot_overlay_addr0=/lib/firmware/<file0>.dtbo#uboot_overlay_addr1=/lib/firmware/<file1>.dtbo#uboot_overlay_addr2=/lib/firmware/<file2>.dtbo#uboot_overlay_addr3=/lib/firmware/<file3>.dtbo######Additional custom capes#uboot_overlay_addr4=/lib/firmware/<file4>.dtbo#uboot_overlay_addr5=/lib/firmware/<file5>.dtbo#uboot_overlay_addr6=/lib/firmware/<file6>.dtbo#uboot_overlay_addr7=/lib/firmware/<file7>.dtbo######Custom Capedtb_overlay=/lib/firmware/am335x-spilcd-adafruit28.dtboSome guidance on the uEnv.txt would be very helpful.
So anyway I reboot but uboot is not happy. Here is the full output from the serial console:
U-Boot SPL 2017.09-00002-g0f3f1c7907 (Oct 09 2017 - 15:30:22)Trying to boot from MMC1
U-Boot 2017.09-00002-g0f3f1c7907 (Oct 09 2017 - 15:30:22 -0500), Build: jenkins-github_Bootloader-Builder-607
CPU : AM335X-GP rev 2.1I2C: readyDRAM: 512 MiBNo match for driver 'omap_hsmmc'No match for driver 'omap_hsmmc'Some drivers were not foundReset Source: Power-on reset has occurred.MMC: OMAP SD/MMC: 0, OMAP SD/MMC: 1Using default environment
Model: BeagleBoard.org PocketBeagle<ethaddr> not set. Validating first E-fuse MACNet: No ethernet found.Press SPACE to abort autoboot in 2 secondsboard_name=[A335PBGL] ...switch to partitions #0, OKmmc0 is current deviceSD/MMC found on device 0** Bad device 0:2 0x82000000 **** Bad device 0:2 0x82000000 **switch to partitions #0, OKmmc0 is current deviceScanning mmc 0:1...gpio: pin 56 (gpio 56) value is 0gpio: pin 55 (gpio 55) value is 0gpio: pin 54 (gpio 54) value is 0gpio: pin 53 (gpio 53) value is 1switch to partitions #0, OKmmc0 is current devicegpio: pin 54 (gpio 54) value is 1Checking for: /uEnv.txt ...Checking for: /boot.scr ...Checking for: /boot/boot.scr ...Checking for: /boot/uEnv.txt ...gpio: pin 55 (gpio 55) value is 12070 bytes read in 46 ms (43.9 KiB/s)Loaded environment from /boot/uEnv.txtChecking if uname_r is set in /boot/uEnv.txt...gpio: pin 56 (gpio 56) value is 1Running uname_boot ...loading /boot/vmlinuz-4.4.110-ti-r142 ...8900056 bytes read in 612 ms (13.9 MiB/s)loading /boot/dtbs/4.4.110-ti-r142/am335x-pocketbeagle.dtb ...130113 bytes read in 126 ms (1007.8 KiB/s)uboot_overlays: [fdt_buffer=0x60000] ...uboot_overlays: loading /lib/firmware/AM335X-PRU-RPROC-4-4-TI-00A0.dtbo ...2402 bytes read in 634 ms (2.9 KiB/s)uboot_overlays: [dtb_overlay=/lib/firmware/am335x-spilcd-adafruit28.dtbo] ...uboot_overlays: loading /lib/firmware/am335x-spilcd-adafruit28.dtbo ...1299 bytes read in 356 ms (2.9 KiB/s)fdt_overlay_apply(): FDT_ERR_NOTFOUNDloading /boot/initrd.img-4.4.110-ti-r142 ...5839816 bytes read in 421 ms (13.2 MiB/s)debug: [console=ttyO0,115200n8 bone_capemgr.uboot_capemgr_enabled=1 root=/dev/mmcblk0p1 ro rootfstype=ext4 rootwait coherent_pool=1M net.ifnames=0 quiet] ...debug: [bootz 0x82000000 0x88080000:591bc8 88000000] ...ERROR: Did not find a cmdline Flattened Device TreeCould not find a valid device tree** Invalid partition 2 **** Invalid partition 3 **** Invalid partition 4 **** Invalid partition 5 **** Invalid partition 6 **** Invalid partition 7 **Card did not respond to voltage select!mmc_init: -95, time 13gpio: pin 56 (gpio 56) value is 0gpio: pin 55 (gpio 55) value is 0gpio: pin 54 (gpio 54) value is 0gpio: pin 53 (gpio 53) value is 1Card did not respond to voltage select!mmc_init: -95, time 13gpio: pin 54 (gpio 54) value is 1Card did not respond to voltage select!mmc_init: -95, time 12** Bad device mmc 1 **Checking for: /uEnv.txt ...Card did not respond to voltage select!mmc_init: -95, time 12** Bad device mmc 1 **Checking for: /boot.scr ...Card did not respond to voltage select!mmc_init: -95, time 13** Bad device mmc 1 **Checking for: /boot/boot.scr ...Card did not respond to voltage select!mmc_init: -95, time 12** Bad device mmc 1 **Checking for: /boot/uEnv.txt ...Card did not respond to voltage select!mmc_init: -95, time 13** Bad device mmc 1 **Card did not respond to voltage select!mmc_init: -95, time 13** Bad device mmc 1 **Card did not respond to voltage select!mmc_init: -95, time 13** Bad device mmc 1 **Card did not respond to voltage select!mmc_init: -95, time 12** Bad device mmc 1 **Card did not respond to voltage select!mmc_init: -95, time 13** Bad device mmc 1 **Card did not respond to voltage select!mmc_init: -95, time 13** Bad device mmc 1 **Card did not respond to voltage select!mmc_init: -95, time 13** Bad device mmc 1 **starting USB...USB0: scanning bus 0 for devices... 1 USB Device(s) found scanning usb for storage devices... 0 Storage Device(s) foundNo ethernet found.missing environment variable: pxeuuidRetrieving file: pxelinux.cfg/C0A80102No ethernet found.Retrieving file: pxelinux.cfg/C0A8010No ethernet found.Retrieving file: pxelinux.cfg/C0A801No ethernet found.Retrieving file: pxelinux.cfg/C0A80No ethernet found.Retrieving file: pxelinux.cfg/C0A8No ethernet found.Retrieving file: pxelinux.cfg/C0ANo ethernet found.Retrieving file: pxelinux.cfg/C0No ethernet found.Retrieving file: pxelinux.cfg/CNo ethernet found.Retrieving file: pxelinux.cfg/default-arm-am33xxNo ethernet found.Retrieving file: pxelinux.cfg/default-armNo ethernet found.Retrieving file: pxelinux.cfg/defaultNo ethernet found.Config file not foundNo ethernet found.No ethernet found.=>For reference yesterday I ran:
cd /opt/scripts/tools && git pull
sudo su
./update_kernel.shAnd now my kernel is:
$ uname -aLinux beaglebone 4.4.110-ti-r142 #1 SMP Mon Jan 8 19:06:43 UTC 2018 armv7l GNU/LinuxCan anyone point out what I'm doing wrong? I'd love to get this screen working. Thanks for your time!
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