Re: onboard wireless on rpi4
| Newsgroups | gmane.os.freebsd.devel.arm |
|---|---|
| Message-ID | <[email protected]> |
September 6, 2020 9:20 PM, "Mark Millard via freebsd-arm" <[email protected]> wrote: > On 2020-Sep-6, at 08:20, Robert Crowston via freebsd-arm <freebsd-arm at freebsd.org> wrote: > >> That's interesting: OpenBSD is allowing only the lowest 1 GB of memory for DMA; the documentation I >> obtained suggests the first 3 GB should be accessible. I am experimenting with this new lower >> bound. > > https://rpi4-uefi.dev/tag/netbsd reports: > > QUOTE > NetBSD also is the only OS today to fully support ACPI _DMA descriptors for describing DMA > translations/constraints. This is very important for supporting Pi and Pi-like platforms via > straight-up ACPI and without platform DMA quirks. > END QUOTE That would be https://reviews.freebsd.org/D25219 for us.. not "full support" though because our bus dma tags are way too weak and inflexible, much worse than NetBSD's :( The RPi ACPI tables declare a 3GB limit for XHCI, and a 1GB limit for some other devices. Namely, devices described by https://github.com/tianocore/edk2-platforms/blob/master/Platform/RaspberryPi/AcpiTables/GpuDevs.asl _______________________________________________ [email protected] mailing list https://lists.freebsd.org/mailman/listinfo/freebsd-arm To unsubscribe, send any mail to "[email protected]"