TFTM035-6, ili9488 on BBB or BBG

[zir...@gmail.com]

Hi,
I am trying to bring up the
https://www.buydisplay.com/default/lcd-3-5-inch-320x480-tft-display-module-optl-touch-screen-w-breakout-board
with DRM_TILCDC on the RGB 16 pins on P8. First I tried to go SPI.
Here is my saga.


I flashed the latest http://debian.beagleboard.org/images/bone-debian-9.5-lxqt-armhf-2018-10-07-4gb.img.xz to BBB
I killed the default u-boot from eMMC, the right uBoot is taken from sdcard

The display wiring is:

LCD________________BBB___________________GPIO_______________________________

JP2 1                          P9_27 (VSYNC)
JP2 2                          P9_29 (HSYNC)
JP2 3                          P9_28 (PCLK)
JP2 4                          P9_30 (DE)

JP1 [3-20]             P8 31-46    (keep first 8 LCD off due: BBB is not booting)
 
JP1 1                P9_1        GND                                    
JP1 2                P9_3        +VCC                          
JP1 21 RESET         P9_12       RST            GPIO 60
JP1 23 CS            P9_17       CS             SPI0_CS0
JP1 24 SCLK          P9_22       CLK            SPI0_SCLK
JP1 25 DC            P9_15       D/C            GPIO 48
JP1 27 MOSI          P9_18       MOSI           SPI 0 D1
JP1 28 MISO          P9_21       MISO           SPI 0 D0
JP1 29 BL/LED        P9_27       LED/BL 29      GPIO 115

I have the uEnv.txt as:

#Docs: http://elinux.org/Beagleboard:U-boot_partitioning_layout_2.0

uname_r=4.14.108-ti-r108
#uuid=
#dtb=

###U-Boot Overlays###
###Documentation: http://elinux.org/Beagleboard:BeagleBoneBlack_Debian#U-Boot_Overlays
###Master Enable
enable_uboot_overlays=1
###
###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 Cape
#dtb_overlay=/lib/firmware/<file8>.dtbo
# dtb_overlay=/boot/dtbs/4.14.108-ti-r108/katerra_tow.dtbo
###
###Disable auto loading of virtual capes (emmc/video/wireless/adc)
#disable_uboot_overlay_emmc=1
#disable_uboot_overlay_video=1
#disable_uboot_overlay_audio=1
#disable_uboot_overlay_wireless=1
#disable_uboot_overlay_adc=1
###
###PRUSS OPTIONS
###pru_rproc (4.4.x-ti kernel)
#uboot_overlay_pru=/lib/firmware/AM335X-PRU-RPROC-4-4-TI-00A0.dtbo
###pru_rproc (4.14.x-ti kernel)
uboot_overlay_pru=/lib/firmware/AM335X-PRU-RPROC-4-14-TI-00A0.dtbo
###pru_uio (4.4.x-ti, 4.14.x-ti & mainline/bone kernel)
#uboot_overlay_pru=/lib/firmware/AM335X-PRU-UIO-00A0.dtbo
###
###Cape Universal Enable
enable_uboot_cape_universal=1
###
###Debug: disable uboot autoload of Cape
#disable_uboot_overlay_addr0=1
#disable_uboot_overlay_addr1=1
#disable_uboot_overlay_addr2=1
#disable_uboot_overlay_addr3=1
###
###U-Boot fdt tweaks... (60000 = 384KB)
#uboot_fdt_buffer=0x60000
###U-Boot Overlays###

cmdline=coherent_pool=1M net.ifnames=0 quiet

#In the event of edid real failures, uncomment this next line:
#cmdline=coherent_pool=1M net.ifnames=0 quiet video=HDMI-A-1:1024x768@60e

#Use an overlayfs on top of a read-only root filesystem:
#cmdline=coherent_pool=1M net.ifnames=0 quiet overlayroot=tmpfs

##enable Generic eMMC Flasher:
##make sure, these tools are installed: dosfstools rsync
#cmdline=init=/opt/scripts/tools/eMMC/init-eMMC-flasher-v3.sh

I compiled the kernel from: https://github.com/RobertCNelson/ti-linux-kernel-dev
I deployed the kernel.

I plugged into kernel this driver: https://github.com/avrxml/asf/tree/master/sam/components/display/ili9488

 sudo modprobe fbtft
 sudo insmod fb_ili9488.ko
dmesg
[ 1066.593329] fbtft: module is from the staging directory, the quality is unknown, you have been warned.
[ 1068.537263] fb_ili9488: module is from the staging directory, the quality is unknown, you have been warned.
debian@beaglebone:~$

I have no /dev/fb*

I also tried this, which generated a /dev/fb0, but cat-ing a /dev/random just flashed the display randomly

sudo cp ~/fb_ili9* ./modules/4.14.108-ti-r108/kernel/drivers/staging/fbtft/
sudo depmod -a
sudo modprobe fbtft_device custom busnum=1 name=fb_ili9488 gpios=reset:60,dc:48,led:115 speed=16000000

I also tried flexfb as:

sudo modprobe flexfb width=480 height=320

sudo modprobe flexfb width=480 height=320 buswidth=8 init=-1,0xb0,0x0,-1,0x11,-2,120,-1,0x3A,0x55,-1,0xC2,0x33,-1,0xC5,0x00,0x1E,0x80,-1,0x36,0x48,-1,0xB1,0xB0,-1,0xE0,0x00,0x04,0x0E,0x08,0x17,0x0A,0x40,0x79,0x4D,0x07,0x0E,0x0A,0x1A,0x1D,0x0F,-1,0xE1,0x00,0x1B,0x1F,0x02,0x10,0x05,0x32,0x34,0x43,0x02,0x0A,0x09,0x33,0x37,0x0F,-1,0x11,-1,0x29,-3

sudo modprobe fbtft_device name=flexpfb buswidth=8 gpios=dc:48,reset:60,wr:27,cs:4,db00:8,db01:9,db02:12,db03:10,db04:13,db05:11,db06:14,db07:15

sudo modprobe flexfb width=480 height=320 buswidth=8 init=-1,0xb0,0x0,-1,0x11,-2,120,-1,0x3A,0x55,-1,0xC2,0x33,-1,0xC5,0x00,0x1E,0x80,-1,0x36,0x48,-1,0xB1,0xB0,-1,0xE0,0x00,0x04,0x0E,0x08,0x17,0x0A,0x40,0x79,0x4D,0x07,0x0E,0x0A,0x1A,0x1D,0x0F,-1,0xE1,0x00,0x1B,0x1F,0x02,0x10,0x05,0x32,0x34,0x43,0x02,0x0A,0x09,0x33,0x37,0x0F,-1,0x11,-1,0x29,-3

What I am missing.

The above SPI approach worked fine with ili9341 SPI display. A screenshot can be seen here:

https://www.amazon.ca/gp/product/B07BDML7LM/ref=ppx_yo_dt_b_asin_title_o04_s00?ie=UTF8&psc=1#customerReviews

Thank you

Thank you.