Re: Raspberry Pi 3B: /dev/mem mmap GPIO works on earmv7hf but not on aarch64

On 16/02/2026 18:33, Izumi Tsutsui wrote:
> Hi,
> 
[snip]

> Questions
> ---------
> 
> - Is /dev/mem + mmap expected to work for BCM283x/2711 peripheral MMIO
>    on evbarm/aarch64?

No. It's lucky it works on evbarmv7.

> - If yes, where should I look for the correct mapping attributes
>    (device vs normal cacheable) for /dev/mem mappings on aarch64?

They don't exist.


> - Does the described behavior sound like a cache attribute / pmap issue,
>    or could it be an address translation issue?

There is no support for device type memory mappings via /dev/mem

What's wrong with gpioctl(8)?