Electronics > Microcontrollers

rasberry pi upgrade 3b->4

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bogdant:
I have a raspberry pi 3b with a ubuntu server 20 is a working state (connected via eth to a router) and today arrived the upgrade rasberry pi 4 8G.
The question is if I just move the SDCARD from rassbery pi 3b to rasberry pi 4 will it boot and have the chance to connect via ssh ?

SiliconWizard:

--- Quote from: bogdant on July 15, 2021, 03:53:39 pm ---I have a raspberry pi 3b with a ubuntu server 20 is a working state (connected via eth to a router) and today arrived the upgrade rasberry pi 4 8G.
The question is if I just move the SDCARD from rassbery pi 3b to rasberry pi 4 will it boot and have the chance to connect via ssh ?

--- End quote ---

I dont think so.

If I'm not mistaken:
- The RPi3B has a BCM2837 SOC. This is based on a Cortex-A53.
- The RPi4 has a BCM2711 SOC. Based on Cortex-A72.

Both CPUs are 64-bit ARM, but not the same. I would expect a number of incompatibilities. There probably are several other hardware differences with onboard peripherals.

jenniferkim:
It is not recommended, but after making a full back up change the sources from Stretch to Buster:

This has a section for Jessie to Stretch, just change the names:

https://www.raspberrypi.org/documentation/raspbian/updating.md

Personally just went with creating a fresh Raspbian Buster in your RPi4 with Desktop SD Card......

dave j:

--- Quote from: jenniferkim on July 22, 2021, 09:01:41 pm ---It is not recommended, but after making a full back up change the sources from Stretch to Buster:

This has a section for Jessie to Stretch, just change the names:

https://www.raspberrypi.org/documentation/raspbian/updating.md

Personally just went with creating a fresh Raspbian Buster with Desktop SD Card......

--- End quote ---

The OP is asking about moving from a Pi3 to a Pi4 whilst running Ubuntu not migrating to a new version of Raspberry Pi OS.

@bogdant
Looking at the Ubuntu for Raspberry Pi download page, they don't have separate 64 bit versions for Pi3s and Pi4s. Assuming you are running an up to date 64 bit Ubuntu on your Pi3 there's a good chance it will work. It doesn't say the 32 bit version won't run on the Pi4 but with 8Gb of memory, you'd probably want to be using the 64 bit version anyway.

ralphrmartin:
I had an RPI3B running a web server, samba server, rss server, with raspbian and software fully updated, with root file system on an SSD. I just switched the SD and SSD over to an RPI4, rebooted, and everything "just worked".

Now, there may be corner cases which rely on the hardware in some way, or speed of operation, etc, but for "straightforward" use cases, a simple switch of this kind appears to work just fine for raspbian. Ubuntu should be similar, but may differ.

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