Posts: 86
Joined: Mon Nov 24, 2014 2:14 pm

RPi4 vs. RPi3

Mon Dec 09, 2019 12:45 pm


I wrote a small multi-threaded application on the RPi3, and I consider porting it to RPi4.
Could you point me to the differences and difficulties I should expect ?
I guess they will be related to differences between:

1. the Cortex A53 and Cortex A72

2. the memory organization (1Go vs 4Go)

3. the BCM2837 vs. BCM2711 SoC

Could you please point me to particular difficulties I should be aware of during

To clarify my way of using the HW: I use no low-level library such as Circle.
Instead, I directly access GPIO (for UART), SD card, MMU configuration,
mailboxes (for various services, such as CPU speed), and of course the ARM
registers (AArch64, Cortex A53) for configuration.


Posts: 84
Joined: Sat Dec 24, 2016 11:54 am

Re: RPi4 vs. RPi3

Mon Dec 09, 2019 9:46 pm

I asked that in this post

https://www.raspberrypi.org/forums/view ... 4f2795ec8f

And the answer was that someone is working on that documentation, we need to wait patiently.

Posts: 24
Joined: Sat Dec 29, 2018 6:22 pm

Re: RPi4 vs. RPi3

Wed Dec 11, 2019 2:55 am

How long did it take for raspberry pi 3 documentation to come out after the board was released?

Return to “Bare metal, Assembly language”