How to change rootfs from official RPI3 image

[Ronald Klop]

Van: Ricky Zhang <zhangchaowang at gmail.com>
Datum: dinsdag, 20 augustus 2019 04:18
Aan: freebsd-arm at freebsd.org
Onderwerp: How to change rootfs from official RPI3 image
> 
> Hi,
> 
> I dd a FreeBSD 12.0 RPI3 image to a SD card. Everything works like a charm
> on my RPI3.
> 
> But I want to switch rootfs to a larger USB hard drive. The boot partition
> contains one configurable text file config.txt. I can't google how the
> uboot load kernel from the rootfs partition. To my surprise, the FreeBSD
> kernel is in the rootfs partition.
> 
> Is this u-boot pieces open source? Where are the user guide documents? The
> only document I could find provides no technical details in boot sequence.
> 
> thanks,
> Ricky
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> 
> 

Hi, I have it arranged that the kernel is loaded from the SD card, but the rest of the system is from an SSD via USB.

In /etc/fstab:
/dev/gpt/ssdrootfs / ufs rw,noatime 1 1
/dev/ufs/rootfs /bootdir ufs rw,noatime 1 2
/dev/msdosfs/MSDOSBOOT /boot/msdos msdosfs rw,noatime 0 2

And a symlink from /boot -> /bootdir/boot

In /boot/loader.conf:
vfs.root.mountfrom="ufs:/dev/gpt/ssdrootfs"
kern.cam.boot_delay="20000"

My 2 cents.

Regards,
Ronald.