Raspberry Pi 4B not booting single user mode on FreeBSD 14.0 aarch64. Does it work for you?

Reply: Mark Millard : "Re: Raspberry Pi 4B not booting single user mode on FreeBSD 14.0 aarch64. Does it work for you?"
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From: Fred Finster <fred_at_thegalacticzoo.com>
Date: Fri, 20 Jan 2023 14:22:36 UTC
was just trying to boot into single user mode from this documentation below:
https://people.freebsd.org/~rodrigc/doc/handbook/makeworld.html
Once in single-user mode, run these commands if the system is formatted 
with UFS:

|#|  *|mount -u /|*
|#|  *|mount -a -t ufs|*
|#|  *|swapon -a|*

example I created this blog post: 
https://ghostbsd-arm64.blogspot.com/2023/01/time-make-j4-buildworld.html
I could boot into multi-user mode but not into Single User Mode on this 
Raspberry Pi 4B.
What do you suggest and how to trouble shoot?  I turned on verbose mode 
and saw that it hung after starting /sbin/init
but do not know why  this aarch64 ARM64 BCM2711 cpu hangs on FreeBSD 
14.0 going into "single user mode".

This Version:

root@Fred_RasPi4B:~ # uname -Kmnopr
FreeBSD Fred_RasPi4B 14.0-CURRENT arm64 aarch64 1400077
root@Fred_RasPi4B:~ # uname -a
FreeBSD Fred_RasPi4B 14.0-CURRENT FreeBSD 14.0-CURRENT #6 
main-n259952-7e2600ea7be2-dirty: Sun Jan 15 18:14:05 PST 2023 
root@Fred_RasPi4B:/usr/obj/usr/src/arm64.aarch64/sys/GENERIC-VCHIQ arm64

  With beastie_disable="NO"  I tried the set boot options  7

3 safe mode  :off
4 single user  :on
5 verbose       :on
backspace   main menu
enter  boot into single user mode

Warning:  no time-of-day  clock registered,  system time will not be set 
accurately
start_init:  trying /sbin/init                   gets to /sbin/init and 
hangs here

Is there specific documentation relating to booting into Single User 
Mode for aarch64 ARM64?

What should I read to understand how to trouble shoot booting the u-boot 
and initial FreeBSD code?

If you are in U-Boot prompt,  will "boot -s"  boot you up to single user 
mode per the documentation?

I assume others using other aarch64 ARM SBC boards have different tools 
for troubleshooting /sbin/init code.




 From FreeBSD forums: 
https://forums.freebsd.org/threads/freebsb-12-boot-halts-on-rpi-3.69000/
Here is the contents of  file /boot/loader.conf, I setup based on the 
above URL.

  cat /boot/loader.conf
# beastie_disable="NO"
# loader_color="YES"

# Disable the beastie menu and color
beastie_disable="YES"
loader_color="NO"

vm.pageout_oom_seq="4096"
vm.pfault_oom_attempts="1"

kern.cam.boot_delay="5000"


I have also tried the  nextboot -o "-s" -k kernel

https://www.freebsd.org/cgi/man.cgi?nextboot(8)

man nextboot

FILES
      /boot/nextboot.conf  The configuration file that the nextboot
                           configuration is written into.

EXAMPLES
      To boot the GENERIC kernel with the nextboot command:

            nextboot -k GENERIC

      To enable into single user mode with the normal kernel:

            nextboot -o "-s" -k kernel


root@Fred_RasPi4B:~ # ls -ld /boot/k*
drwxr-xr-x  2 root  wheel  15360 Jan 15 23:32 /boot/kernel
drwxr-xr-x  2 root  wheel  15360 Dec 13 11:43 /boot/kernel.old
drwxr-xr-x  2 root  wheel  15360 Aug  5 02:31 /boot/kernel.original.F14


root@Fred_RasPi4B:~ # kldstat
Id Refs Address                Size Name
  1   45 0xffff000000000000  1319fa0 kernel
  2    1 0xffff0000ff800000    5d000 linux64.ko
  3    1 0xffff0000ff85d000    36000 linux_common.ko
  4    1 0xffff0000ff893000    3c000 netlink.ko
  5    1 0xffff0000ff8cf000    35000 if_rtwn_usb.ko
  6    2 0xffff0000ff904000    7b000 wlan.ko
  7    1 0xffff0000ff97f000    3d000 rtwn.ko
  8    1 0xffff0000ff9bc000    24000 uhid.ko
  9    1 0xffff0000ffc00000    26000 ums.ko
10    1 0xffff0000ffc26000    25000 usbhid.ko
11    1 0xffff0000ffc4b000    25000 hidbus.ko
12    1 0xffff0000ffc70000    25000 wmt.ko
13    1 0xffff0000ffc95000    22000 mac_ntpd.ko


root@Fred_RasPi4B:~ # ls -l /boot/ne*
-rw-------  1 root  wheel  58 Jan 20 04:08 /boot/nextboot.conf
root@Fred_RasPi4B:~ # cat /boot/nextboot.conf
nextboot_enable="YES"
kernel_options="-s"
kernel="kernel"

root@Fred_RasPi4B:~ # shutdown -r now

Shutdown NOW!
shutdown: [pid 2409]
root@Fred_RasPi4B:~ #
*** FINAL System shutdown message from root@Fred_RasPi4B ***

System going down IMMEDIATELY



System shutdown time has arrived
Connection to 192.168.1.7 closed by remote host.
Connection to 192.168.1.7 closed.

Hangs at these two lines:

Warning: no time-of-day clcok registered,  system time will not be set 
accurately.

start_init: trying /sbin/init


Ctrl-T  Ctrl-C, does nothing,  Ctrl-Alt-Delete  reboots the system


I have not hooked up the debugger yet to see where and why the single 
user mode is hung up

after /sbin/init starts


Warning:  no time-of-day  clock registered

start_init:  trying /sbin/init                   gets to /sbin/init and 
hangs here


Debugger That I have available  Black Magic Probe V2.3 Debugger. 
https://black-magic.org/

Can purchase here: https://1bitsquared.com/products/black-magic-probe


    Black Magic Probe V2.3 url Links:

https://black-magic.org/getting-started.html 
<https://www.blogger.com/blog/post/edit/2557899051335274655/7101986330636354658#> 
  Getting Started page, where to buy. Connect the Black Magic Probe to 
your computer’s USB port with mini USB cable.


    Video Tutorial https://youtu.be/ANM0fdAqDow
    <https://www.blogger.com/blog/post/edit/2557899051335274655/7101986330636354658#>


https://black-magic.org/hardware.html 
<https://www.blogger.com/blog/post/edit/2557899051335274655/7101986330636354658#> 
Blog with Hardware Version Pictures and Notes


Hackaday writeup:  https://hackaday.com/tag/black-magic-probe/

Get Started    https://black-magic.org/getting-started.html


https://news.ycombinator.com/item?id=19441088

-- 
Fred  Finster
fred@thegalacticzoo.com
+1 971-718-9144
https://GhostBSD-ARM64.blogspot.com
https://ghostbsd.org