Re: How to boot from SD but run from USB?

yeti <yeti@tilde.institute> wrote:

Chris Green <cl@isbd.net> wrote:
 

Is it simply a matter of leaving /boot on the SD card and changing /
to being a USB drive or does one need to edit something in /boot
somewhere?

 
That would work, but I think there is an even simpler way:
 
Put only "bootcode.bin" on a FAT partition on the SD and a complete OS
image on the USB drive.
 
When you see "/boot/bootcode.bin" on your USB drive being updated,
update the other one too.  A script for that should not need dark magic,
but it still is on my to do list.
 

I know it had to be pretty simple! :-)  I have some other old Pi
systems lying around here so I can try it on them.  The Pi that I
actually want to do this on is in France and I won't be there for a
couple of weeks.

A script to update the bootcode.bin on the FAT drive should be pretty
simple, just put it in /etc/rc.local and it will be run every time you
boot.  It won't matter running it if /boot/bootcode.bin hasn't been
updated, though I suppose you might complain that it's writing to the
SD card unnecessarily.  OK, use rsync and the file will only be
written if it has changed.

--
Chris Green
·