How to change rootfs from official RPI3 image

[Ricky Zhang]

> BTW: Yes, u-boot is opensource: /usr/ports/sysutils/u-boot-rpi3
> There are sysutils/u-boot-* ports for different system. With sysutils/u-boot-master as the main part of it.
> 
> https://www.freshports.org/sysutils/u-boot-rpi3 <https://www.freshports.org/sysutils/u-boot-rpi3>
> http://www.denx.de/wiki/U-Boot <http://www.denx.de/wiki/U-Boot>
> 
> Regards,
> Ronald.


Hi Ronald,

Sorry, if I messed up the mailing list thread. I didn’t receive your email directly. Instead, I got your reply from daily digest. I have to copy subject and quote your reply manually in my email client. I have no idea how to fix it after reading all FAQ (https://www.freebsd.org/doc/en_US.ISO8859-1/articles/mailing-list-faq/article.html#etiquette <https://www.freebsd.org/doc/en_US.ISO8859-1/articles/mailing-list-faq/article.html#etiquette>). Any other mailing list I subscribed didn’t work this way...

In any case, the magic works. I did rsync:

rsync -aAXvr --progress --delete /* /mnt/USB \
    --exclude='/boot/msdos/*' \
    --exclude='/dev/*' \
    --exclude='/proc/*' \
    --exclude='/net/*' \
    --exclude='/tmp/*' \
    --exclude='/mnt/*' \
    --exclude='/media/*'

I confirmed that it mount ssd as rootfs:

Ricky at router ~ $ df -h
Filesystem                  Size    Used   Avail Capacity  Mounted on
/dev/label/gpt/ssdrootfs    407G    5.5G    369G     1%    /
devfs                       1.0K    1.0K      0B   100%    /dev
/dev/msdosfs/MSDOSBOOT       50M     13M     37M    26%    /boot/msdos
tmpfs                        50M    4.0K     50M     0%    /tmp

As you said, kernel still comes from SD card. I don’t fully understand the FreeBSD boot process. Neither am I familiar with UEFI.

- I guess /boot/msdos/uboot.bin finds the SD card roofs system. Load the kernel from /boot/kernel in SD card and scan /boot/loader.conf to find the rootfs. Please correct me if I’m wrong.
- Should I remove /boot folder from SSD to avoid confusion? 
- Are there any guide how to compile and deploy kernel?