Re: onboard wireless on rpi4
Mark Millard via freebsd-arm <[email protected]>
| Newsgroups | gmane.os.freebsd.devel.arm |
|---|---|
| Message-ID | <[email protected]> |
On 2020-Sep-6, at 11:20, Mark Millard <marklmi at yahoo.com> 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 I'll also note that for the last month or so the linux 5.8 kernel has use of: acpi_dma_get_range(dev, &dmaaddr, &offset, &size) and rc_dma_get_range(dev, &size) and nc_dma_get_range(dev, &size) in iort_dma_setup(struct device *dev, u64 *dma_addr, u64 *dma_size) in root/drivers/acpi/arm64/iort.c . (There apparently still is/was also some sort of zero copy DMA problem on the XHCI controller for 5.8. Still, https://github.com/pftf/RPi4/issues/20 was closed based on the linux progress in 5.8 : booting linux with more than 3072 MiB was working.) >> ‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐ >> On Sunday, 6 September 2020 13:40, Klaus Cucinauomo <maciphone2 at googlemail.com> wrote: >> >>>> Am 06.09.2020 um 06:40 schrieb Warner Losh <[email protected]>: >>>> >>>> I thought I read they added the busdma constraints we are missing… >>>> >>>> Warner >>> >>> Yes, for OpenBSD I thought the same , to be a little more specific : >>> >>> https://github.com/openbsd/src/commit/aae395593ca184a639a1c158ceb4b2132d85e7c2 >>> >>> https://github.com/openbsd/src/commit/a88d14946aed5dc48e4e700486795c8d171576d0 >> > > === Mark Millard marklmi at yahoo.com ( dsl-only.net went away in early 2018-Mar) _______________________________________________ [email protected] mailing list https://lists.freebsd.org/mailman/listinfo/freebsd-arm To unsubscribe, send any mail to "[email protected]"