Re: aarch64 bus_space

[Tobias Nygren <tnn%NetBSD.org@localhost>]

On Sat, 04 Oct 2025 20:43:33 +0100
Robert Swindells <rjs%fdy2.co.uk@localhost> wrote:

> Is there any restriction on physical addresses of devices that can
> be mapped?
> 
> One register block of the RK3588 PCIe controller is above the 4G line.
> 
> Reading or writing using the bus_space_handle_t setup for it just
> locks up the machine.
> 
> Have tried both with and without BUS_SPACE_MAP_NONPOSTED.

The Ampere Altra has devices that reside much higher, in the terabytes
region. If it locks up when reading I'm leaning towards some required
clock gate not being enabled.

-Tobias