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

RPi4 vs. RPi3

Mon Dec 09, 2019 12:45 pm

Hello,

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
development?

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.

Best,
Dpotop
dpotop

timanu90
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.

9k1l4oc8
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?

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