CONFIG_PREEMPT_RT=y. I was hoping to use the OrangePi5 Pro - with Linuxcnc - for machine controls - This would require predictable response times for precision cutting routines. The kernel build settings in the current release do not include the Setting for PREEMPTIVE_RT. Debian for X86 defaults to having it setup to support a Fully Preemptive mode. I am wondering why this hasn't trickled down to SBC builds. Byte2bot sells a shield card for converting the Pi 20 pin header to a Parallel port for connecting to CNC motion control cards - roughly $50 without having any manual wiring. Really slick - but at the moment - its would be good for Raspberry pi 4 and 5 as they have the Realtime kernel build available. I have a Tower PC with PCIe parallel on debian bookwork setup for machine control for a milling machine. So the Orange_Pi_5 is a much better solution . Please let me know how if I am on the correct track. I will copy the config file to the .config file in the kernel build directory -- This should be found in the /boot directory or the /proc directory - and add in the PREEMPT commands for fully PREEMTIVE that I found listed in the Kconfig file. Then I have to figure out where to place the orangepi5pro.csc file you pointed me to. At that point I should try to find some reference material about the Preemption settings the make process is going to ask me about. make should complete, and then "make module_install" - Then "make modules" At that point - the build is done. I will have to sort out how the /boot files need to be modified. Sorry for all the questions - If there is some reference material - that is clear about the Image Uinitram the Armbian Environment - and other boot related topics please point them out.

update: if disconnect TX from USB-UART adaptor - then there is infinite output that changes every microsecond with more strings: ESC[1;47rESC[46;1H[ 45.827723][ Tible6] [dhd-wlan0] w l_ext_iapsta_evefs.readdy=1 (/system/etcb/init/hw/init.uo sr not foun db^MESC[1;46rESC[46;1H ESC[1;47rESC[46;1Hnt : [S] Link UP with c8::ca:98^MESC[1;46rESC[46;1H ESC[1;47rESC[46;1HESC[1;46rESC[46;1H ESC[1;47rESC[46;1H[ 45.827747][ T6] [dhd-wlan0] wconsole:/ $ ^MESC[1;46rESC[46;1H ESC[1;47rESC[46;1Hl_notify_connect_status : wl_bss_conn.127^MESC[1;46rESC[46;1H ESC[1;47rESC[46;1Hect_done succeeded with c8:ca:98 ^MESC[1;46rESC[46;1H ESC[1;47rESC[46;1HESC[1;46rESC[46;1H ESC[1;47rESC[46;1H[ 45.843270][ T6] [dhd-wlan0] wl_notify_connect_sonso le:/ $ c^MESC[1;46rESC[46;1H ESC[1;47rESC[46;1Htatus : wl_bss_connect_done succeeded127|^MESC[1;46rESC[46;1H ESC[1;47rESC[46;1H with c8:7f:54:e0:ca:98 vndr_oui: 00-90-127|^MESC[1;46rESC[46;1H ESC[1;47rESC[46;1H4C 00-0C-43 00-0C-E7 ^MESC[1;46rESC[46;1H ESC[1;47rESC[46;1HESC[1;46rESC[46;1H ESC[1;47rESC[46;1H[ 45.881840][ T165] type=1400 audit(1699712132.610:14conssole:/ $ ^MESC[1;46rESC[46;1H ESC[1;47rESC[46;1H4): avc: denied { open } for comm="FD655_Demo" path="/sys/class/fd655/fd65console:/ $ ^MESC[1;46rESC[46;1H ESC[1;47rESC[46;1H5_vpause_127|y^MESC[1;46rESC[46;1H ESC[1;47rESC[46;1Hflag" dev="s127fig=|^MESC[1;46rESC[46;1H ESC[1;47rESC[46;1Hysfs" ino=19647 sc[ 82.040633][ T386] read descriptors^MESC[1;46rESC[46;1H ESC[1;47rESC[46;1H[ 82.040698][ T386] read strings^MESC[1;46rESC[46;1H ESC[1;47rESC[46;1H[ 82.043097][ T1] init: processing action (sys.usb.config=adb && sys.usb.configfs=1 && sys.usb.ffs.ready=1) f82.045159][ T1] init: Co mmand 'symlink /coESC[46;159HnESC[46;159HfESC[46;159HiESC[46;159HgESC[46;159H But still no active shell session

Werner - thanks - I did check the community and only found builds for 6.1 -- I did a build and had added three lines in the .conf file CONFIG_ PREEMPTICE_RT=y CONFIG_PREEMPTION=y and CONFIG_PREEMPT=y as I recall. did the "make" "make modules_install" and then the "make module" and there were a string of questions - during the make about some of the pre-emption options, which I was unprepared to answer. Not worried about those. I was concerned that the modules_install and the module make commands were installing the necessary routines. I do not understand how the orangepi5pro.csc file gets incorporated into the build process. I was on an Orangepi os to run the krtnrl build. Now moving back to Armbian 6.1.115. I am downloading a Armbian community supported 6.1.115 download for orange pi pro. I will then download the rockchip-rk3588.conf file - and the orangepi5pro.csc file - not sure where the board config file goes and how it ties into the kernel build process - might need a pointer for that Jim

Hello, finally CH340G usb-uart has arrived - I have checked it performs data transfer on 1.5M speed in RX/TX loop normally. But when connecting to board - there is no output to console at all. Have tried RX/TX changing still no output, just regular start of android TV box. Please suggest does UART needs to be enabled in some screen/menu?

just wanted to check if there is plan to have an image for the Rock 3B model? update: just tested the latest image for Rock 3A, and it is working ok. version: Armbian 25.2.1 Bookworm Minimal/IOT Kernel: 6.12.13, Size: 266.4 MB, Release date: Feb 13, 2025 I will run a few docker containers to see if there are any issues.