GhostBSD ARM64 porting from x86 code base (RISC-V in the future??)

 Uart3 Serial Port,  How to locate the source code used by FreeBSD / GhostBSD-Arm64 Edit the file /etc/rc.conf  and  add the bash execution line 'set -x'  This will produce verbose output from  'make buildkernel KERNCONF=GENERIC-VCHIC   -DNO_CLEAN Issue the  'make buildkernel' command and direct stdout & stderr to a file. make buildkernel KERNCONF=GENERIC-VCHIQ -DNO_CLEAN > BRCM64_GENERIC-VCHIQ.txt 2>&1  later you can run make installkernel KERNCONF=GENERIC-VCHIQ ===> wlan_tkip (install) install -T release -o root -g wheel -m 555   wlan_tkip.ko /boot/kernel/ install -T dbg -o root -g wheel -m 555   wlan_tkip.ko.debug /usr/lib/debug/boot/kernel/ ===> wlan_wep (install) install -T release -o root -g wheel -m 555   wlan_wep.ko /boot/kernel/ install -T dbg -o root -g wheel -m 555   wlan_wep.ko.debug /usr/lib/debug/boot/kernel/ ===> wlan_xauth (install) install -T release -o root ...

 Raspberry Pi 4B  uart3 enable documentation Rpi4 uart3 enable https://forums.raspberrypi.com/viewtopic.php?t=340392    Forum Post about enabling uart3 dtoverlay=uart3 is all you need for enabling it (either w/ or w/o flow control). I.e. on my CM4 DUT   You add a line to the  config.txt  file to apply a  Device Tree overlay .  dtoverlay=uart4 dtoverlay=uart3 or dtoverlay=uart3,ctsrts //here I trying both with and without "ctsrts" gives me pi@64bit-test:~ $ raspi-gpio get BANK0 (GPIO 0 to 27): GPIO 0: level=1 fsel=0 func=INPUT pull=UP GPIO 1: level=1 fsel=0 func=INPUT pull=UP GPIO 2: level=1 fsel=0 func=INPUT pull=UP GPIO 3: level=1 fsel=0 func=INPUT pull=UP GPIO 4: level=1 fsel=3 alt=4 func=TXD3 pull=NONE GPIO 5: level=1 fsel=3 alt=4 func=RXD3 pull=UP GPIO 6: level=1 fsel=0 func=INPUT pull=UP GPIO 7: level=1 fsel=0 func=INPUT pull=UP GPIO 8: level=1 fsel=3 alt=4 func=TXD4 pull=NONE GPIO 9: level=1 fsel=3 alt=4 func=RXD4 pull=UP GPIO 10:...

Raspberry Pi 4 Device Tree compile and setup August 6, 2023 My AIM is too add a Serial Port 3 UART Device Tree Overlay for a Adafruit.com GPS device https://forums.raspberrypi.com/viewtopic.php?t=244827   DT Overlay enable 5 serial ports;  Pi-4 Activating additional UART ports https://learn.adafruit.com/adafruit-ultimate-gps/overview We carry a few different GPS modules here in the Adafruit shop, but none that satisfied our every desire - that's why we designed this little GPS breakout board. We believe this is the  Ultimate  GPS module, so we named it that. It's got everything you want and more: https://www.adafruit.com/product/790 Description For those who want to integrate our awesome Ultimate GPS module into their own projects, we now have the raw sub-module available. Don't be fooled by it's small size, this is a very sensitive, high quality GPS module with all the extras you could want and more at under 6 grams! As of October 12, 2022  -  the original...

Multifunction Ports on the Raspberry Pi 4B,  Pinout and Alternate Name Functions https://raspberrypi.stackexchange.com/questions/104464/where-are-the-uarts-on-the-raspberry-pi-4 https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=269104   John R.  forum Post https://www.studiopieters.nl/raspberry-pi-4-model-b-pinout/   Sudio Pieters Netherlands Raspi4B pinout. https://lambdaland.org/posts/2020-12-23_freebsd_rpi4/   2020 FreeBSD install, Tier 3 now Tier 1,  Rust Language setup. https://github.com/raspberrypi/linux/blob/7f465f823c2ecbade5877b8bbcb2093a8060cb0e/arch/arm/boot/dts/bcm2711.dtsi#L41 Interrupt Code for Raspberry Pi 4 from Raspberry Pi Linux As Joan has stated only 1 of UART0/1 is accessible (UART0   /dev/ttyAMA0   is connected to Bluetooth on later model Pi). There are additional UART on the Pi4. Raspberry Pi4 UART  is a more up to date answer. https://raspberrypi.stackexchange.com/questions/104464/where-are-the-uarts-on-the-raspberry-...