On 2019-07-03, A  Dumas  wrote:
> David Taylor  wrote:
>> The more I think about it, having the SSD as the system boot device
>> might be a good idea as well.  Seems like that should be easy at least
>> with the 3B+, and perhaps therefore the 4B.
>
> Definitely a good idea but doesn't work yet. They're working on updates
> that will enable net boot and usb boot on the Pi4. You could easily boot a
> minimal image from sd card and move the root file system to the ssd,
> though.
>

Yet, you can use the SDcard to hold only the /boot partition with the
kernel and firmware etc and boot to a root partition on a USB attached
device. You simply specify the relevant root partition in the cmdline.txt
file.

Once set up I make the SDcard  /boot partition readonly to prevent any
corruption of the SDcard.

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