How to compile FreeBSD with COM2 as the boot console serial port

Hi,

I’m trying to compile the FreeBSD kernel to use COM2 instead of COM1 as the boot console serial port.

I’ve got a VirtualBox VM running FreeBSD 13.0-RELEASE and have checked out the FreeBSD source to commit ef1e43df92c6 .

I want my FreeBSD kernel to use serial port COM2 (instead of COM1) for the console when it boots up. I also want it to use baud rate 115200.

I have a /etc/make.conf which is the following:
```
BOOT_COMCONSOLE_PORT="0x2F8"
BOOT_COMCONSOLE_SPEED=115200
```

I have added the line
```
device ttyu1 port IO_COM2 flags 0x30 irq 3
```
to the end of my kernel configuration file.

But when I run the commands "sudo make clean && sudo make buildkernel KERNCONF=MAINCONFIG" from the root directory, config fails with a syntax error on the line that I added to my kernel configuration file. Do you guys have any ideas how I could fix this?

When I run `ls dev | grep ttyu1` in the VM there are entries for `ttyu1`, `ttyu1.init`, and `ttyu1.lock`, not sure if this is relevant here.

Thank you,
James Pedersen
 
Just curious, did you come up with this syntax yourself or is there some document that describes it?
This syntax is my own invention. I have no idea it it’s right or not. At the moment I don’t know where to find info about the right syntax.
 
I ended up solving this issue by doing the following:

1. Creating /boot.config with line:
Code:
-Dh -S115200
2. Creating /boot/loader.conf:
Code:
boot_multicons=“YES”
boot_serial=“YES”
console=“comconsole,vidconsole”
comconsole_port=“0x2F8”
comconsole_speed=“115200”
3. Editing /etc/ttys to be as follows:

console none unknown off secure
Code:
ttyv0 “/usr/libexec/getty Pc” xterm onifexists secure
ttyv1 “/usr/libexec/getty Pc” xterm onifexists secure
ttyv2 “/usr/libexec/getty Pc” xterm onifexists secure
ttyv3 “/usr/libexec/getty Pc” xterm onifexists secure
ttyv4 “/usr/libexec/getty Pc” xterm off secure
ttyv5 “/usr/libexec/getty Pc” xterm off secure
ttyv6 “/usr/libexec/getty Pc” xterm off secure
ttyv7 “/usr/libexec/getty Pc” xterm off secure
ttyv8 “/usr/local/bin/xdm -nodaemon” xterm off secure
ttyu0 “/usr/libexec/getty 3wire” vt100 onifexists secure
ttyu1 “/usr/libexec/getty std.115200” vt100 onifexists secure
ttyu2 “/usr/libexec/getty 3wire” vt100 off secure
ttyu3 “/usr/libexec/getty 3wire” vt100 off secure
dcons “/usr/libexec/getty std.115200” vt100 onifexists secure
xc0 “/usr/lib/getty Pc” xterm off secure
rcons “/usr/libexec/getty std.115200” vt100 onifexists secure
This solved the issue.

Basically I wanted to boot my pfSense box using a FreeBSD USB drive so that I could fsck.ufs the pfSense filesystem. But the hardware running pfSense uses COM2 for the serial port running at a baud rate of 115200, hence my desire to make these modifications.
 
Hi,

I’m trying to compile the FreeBSD kernel to use COM2 instead of COM1 as the boot console serial port.

I’ve got a VirtualBox VM running FreeBSD 13.0-RELEASE and have checked out the FreeBSD source to commit ef1e43df92c6 .

...
Hello James,
FreeBSD can't be installed to my computer due to an old bug:



I don't know why it's still not solved, I want to use the exact same FreeBSD version ef1e43df92c6, can you let me know please how you setup the virtual machine to compile it ?

I want to apply this patch but I don't know how:


Hope you can help.
Thank you.
 
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