Asking for help, to locally compile FreeBSD source code for ARM cpu for Raspberry Pi 4B with 8 Gigs

Hello fellow  FreeBSD ARM developers,

I wish to setup a duplicate environment that you have on your local 
machine to compile the FreeBSD kernel for a Raspberry Pi 4B with 8 Gigs 
Dram memory, on my local AMD64 machine.   ( does this same image work 
directly with the Raspberry Pi 400 keyboard?  Is there a different 
configuration file to use for the Raspi Keyboard 400?).

Can you share any configuration files that you have created with me?   
Is it simple as following the FreeBSD  Handbook chapters 8,24 for 
compiling  and adding "Target_Arch=aarch64" to the Makefile? I think I 
found my answer in the personal website URL links below.  Like abnevme

https://docs.freebsd.org/en/books/handbook/kernelconfig/ Chapter 8

https://docs.freebsd.org/en/books/handbook/cutting-edge/ Chapter 24


URL links to Read: and increase our knowledge

http://www.mrp3.com/fbsd_rpi.html  Using FreeBSD on a Raspberry Pi 3

https://ogris.de/howtos/freebsd-raspberry.html  50 step howto

https://abnevme.wordpress.com/2014/06/21/84/ 2nd take

06.21.14 <https://abnevme.wordpress.com/2014/06/21/84/>
by abnev <https://abnevme.wordpress.com/author/abnev/>


  Building a custom FreeBSD image for the RaspberryPi from source

https://abnevme.wordpress.com/2014/06/18/building-a-custom-freebsd-raspberrypi-image/ 
Building a custom image for Raspberry Pi

https://medium.com/swlh/freebsd-usb-boot-on-raspberry-pi-4-765cb6e75570 
Alan Thompson Nove 2020 medium article.

https://a-delacruz.github.io/ubuntu/rpi3-setup-64bit-uboot.html Rpi3 
setup 64bit Uboot



So many specific questions,  I have.  Probably have included too much 
information here. Sorry.  Will try to setup mail app to send text only 
format.

Thank you for helping a new participant, to build the same as you.


Is there a reason to use the gcc over clang compiler?   I like using 
the  clang compiler.


Here is a search on the freebsd buglist for "raspberry"
<https://bugs.freebsd.org/bugzilla/buglist.cgi?quicksearch=raspberry&list_id=420179>

https://bugs.freebsd.org/bugzilla/buglist.cgi?quicksearch=raspberry&list_id=420179


BUGS:

TL-WN823N  rtl8188eu RealTek chip set.  Works on x64-86 GhostBSD 13.0 
(based on FreeBSD 13.0 sources absorbed/transferred into GhostBSD 
sources.  Does the ports need to be updated for the FreeBSD ARM build 
kernel?   tested on snapshot version April 1, 2021 RPI FreeBSD 14.0 
CURRENT kernel.   Will try again with the May 6 or later date snapshot. 
Maybe it got fixed since April 1 2021 snapshot version.
<https://download.freebsd.org/ftp/snapshots/arm64/aarch64/ISO-IMAGES/13.0/>

https://download.freebsd.org/ftp/snapshots/arm64/aarch64/ISO-IMAGES/13.0/

Same chip USB Wifi Dongle,  can  "ifconfig wlan0 up scan" and list local 
access points.

yet using   "wpa_supplicant -d -K -i wlan0 -c /etc/wpa_supplicant.conf " 
fails during the "ifconfig wlan0 down" sequence of powering down the 
chip rtl8192eu.  Was testing a wifi usb dongle replacement for the 
Broadcom Wifi chipset on the Raspberry Pi board.


ADDITIONAL RESOURCES:

I am testing building FreeBSD ARM kernel from source, then moving on to 
building GhostBSD.org from source code.  I have a blog and telegram 
group associated with those activities.

https://ghostbsd_arm64.blogspot.com My Blog about compiling GhostBSD for 
ARM and testing on Raspberry Pi.

https://t.me/joinchat/ST6N61pnu3Di8zgk Telegram Group  "GhostBSD ARM port"


CONFIGURATION SETUP:

I am trying to keep track of (or audit)  which files work to boot up 
RaspberryPi 4B with 8 gigs.

I found this audit tool md5deep and installed from pkgs

pkg install md5deep

md5deep -z -b * > ~/audit_bootfiles_raspi4b_may12.md5

My Config.txt  file supports  1920x1080 pixel HDMI output to TV / screen 
monitor.

https://ghostbsd-arm64.blogspot.com/2021/04/april-1-2021-configtxt-changes-raspi.html

Modify config.txt file to match the following:  comment out #hdmi_safe=1

[pi4]
#hdmi_safe=1
#overscan_left=1
# 1080p screen  1920x1080 pixel screen size
hdmi_group=1
hdmi_mode=16

cat /media/BOOT/config.txt
[all]
arm_64bit=1
dtparam=audio=on,i2c_arm=on,spi=on
dtoverlay=mmc
dtoverlay=disable-bt
device_tree_address=0x4000
kernel=u-boot.bin

[pi4]
hdmi_safe=1
armstub=armstub8-gic.bin


NEW VERSION:

cat /media/BOOT/config.txt
[all]
arm_64bit=1
dtparam=audio=on,i2c_arm=on,spi=on
dtoverlay=mmc
dtoverlay=disable-bt
device_tree_address=0x4000
kernel=u-boot.bin

[pi4]
#hdmi_safe=1

#overscan_left=1
# 1080p screen  1920x1080 pixel screen size
hdmi_group=1
hdmi_mode=16armstub=armstub8-gic.bin

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      5888  74647627f798ca2a3fbed3c13e342c71  armstub8.bin
       141  daa84f7928905470af6969db30de4af3  config.txt
      3187  3af5097c49ce34ba375452ff5e486c05  fixup_cd.dat
     28392  1a08a1b0a13ae93e0106384057136be3  bcm2710-rpi-3-b.dtb
     52456  bc175da040361a117dea6ca0d5459c12  bootcode.bin
       124  5aeff4c2e6496760c2b754cf51fabf6e  README
      7314  81f4693f6e65112b4e545d3f02f018f0  fixup.dat
     10298  6bebd59753c504c3b312371014d8df26  fixup_db.dat
     10298  4f30700929f834278238b1b0b6327b93  fixup_x.dat
    793116  75c18a9fb7a5a851f4ee87bb70673b40  start_cd.elf
    513168  e42c9fa7253d4c8d30c3c3e1c88f328e  u-boot.bin
   2952960  1ac5026674c8b8c9acdd8e43e7bc1d81  start.elf
   3704808  40810618fd52598375c18856db1f13f9  start_x.elf
   4794472  cb35a8bed01f9b4bb9b80105b2a1dc8a  start_db.elf