On Mon, 18 Mar 2019 at 03:39, Hongbo Zhang <hongbo.zh...@linaro.org> wrote: > > On Fri, 15 Mar 2019 at 18:41, Ard Biesheuvel <ard.biesheu...@linaro.org> > wrote: > > > > On Fri, 15 Mar 2019 at 11:08, Hongbo Zhang <hongbo.zh...@linaro.org> wrote: > > > > > > For the Aarch64, there is one machine 'virt', it is primarily meant to > > > run on KVM and execute virtualization workloads, but we need an > > > environment as faithful as possible to physical hardware, for supporting > > > firmware and OS development for pysical Aarch64 machines. > > > > > > This patch introduces new machine type 'sbsa-ref' with main features: > > > - Based on 'virt' machine type. > > > - A new memory map. > > > - CPU type cortex-a57. > > > - EL2 and EL3 are enabled. > > > - GIC version 3. > > > - System bus AHCI controller. > > > - System bus EHCI controller. > > > > Hello Hongbo, > > > > Apologies for bringing this up now, but I seem to remember that the > > EHCI does not support 64-bit DMA. Did you run into any issues with > > this? Or was this fixed in QEMU in the mean time? > > > Hi Ard, > Which EHCI do you mean? > This time I use a newly introduced system bus EHCI, commit 114529f7 > and I only tested USB mouse and key board, didn't test DMA function. >
The host controller doesn't work without DMA, so if mouse and keyboard worked for you, and no DRAM exists below the 4 GB mark, this has apparently been fixed in QEMU.
