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From: bp@www.zefox.net
Newsgroups: comp.sys.raspberry-pi
Subject: Re: Pi2 bootcode.bin puzzle
Date: Sun, 30 Mar 2025 18:38:08 -0000 (UTC)
Organization: A noiseless patient Spider
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Theo <theom+news@chiark.greenend.org.uk> wrote:
> 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. :-)
>> 
>> 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!
> 
> Does it show the FreeBSD beastie text-mode screen?
> https://docs.freebsd.org/images/books/handbook/virtualization/qemu-freebsd02.png
> 
> In which case you can probably set things up in loader.conf:
> https://docs.freebsd.org/en/books/handbook/boot/index.html#boot-loader
> 
> the same way you do on x86.

Might it be possible to let the machine boot from microSD to the 
loader prompt, next re-load the kernel from the USB drive, then
start the new kernel and finally mountroot from USB?

That seems too easy. I must be missing something.

Thanks for writing!

bob prohaska