Re: port-arm/57643: aarch64: smmu(4) seems mandatory for some SoC and/or memory configuration

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

The following reply was made to PR port-arm/57643; it has been noted by GNATS.

From: Tobias Nygren <tnn%NetBSD.org@localhost>
To: gnats-bugs%netbsd.org@localhost
Cc: rokuyama.rk%gmail.com@localhost
Subject: Re: port-arm/57643: aarch64: smmu(4) seems mandatory for some SoC
 and/or memory configuration
Date: Wed, 4 Oct 2023 17:12:17 +0200

 > It occurs LK2K with 64 and 32GB memory. On the other hand, I've
 > never observed similar errors on ROCKPro64 (U-Boot, 4GB memory)
 > and Quartz64 (UEFI, *8GB* memory).
 
 Just to add a data point. Writing this letter from an LX2K, 64 GB
 with wm(4) that says it uses 64-bit DMA:
 
 wm0 at pci5 dev 0 function 0, 64-bit DMA: Intel i82574L (rev. 0x00)
 
 This card works fine, as does ahcisata(4) and xhci(4) which also
 use 64-bit DMA.