Re: Pi2 bootcode.bin puzzle

On 29/03/2025 14:30, bp@www.zefox.net wrote:

Mike Scott <usenet.16@scottsonline.org.uk.invalid> wrote:

On 29/03/2025 04:47, bp@www.zefox.net wrote:

I've yet to figure out what the FreeBSD equivalent to cmdline.txt
is. That might be the key to making your approach work.

>
Fbsd 13.x on a pi4, booting off a usb disk:
>
# cat /boot/msdos//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
>
>
At least, I assume that's the equivalent file. :-)

 

It is

AIUI, config.txt sets up the Pi, cmdline.txt furnishes
runtime arguments to the kernel when that kernel is
linux. If this isn't true somebody please correct me!
 

Yes. and the important bit is that cmdline.txt determines what file system is used to boot it *initially*
e.g.
console=serial0,115200 console=tty1 root=PARTUUID=778a9e44-02 \
rootfstype=ext4 fsck.repair=yes rootwait noswap=1
Note the root=command.
On the USB drive you must  also have the same ID in the /etc/fstab file...
PARTUUID=778a9e44-02  /               ext4    defaults,noatime  0       1
So an SD card boot on PIOS can use a USB drive to finish the boot and mount the root filesystem.
As for BSD, there must be an equivalent file somewhere

Thanks for writing,
 bob prohaska
   

--
For every complex problem there is an answer that is clear, simple, and wrong.
H.L.Mencken