Re: PCI / PCIe Device Memory - Rationale for Choosing MMIO Over PMIO (and Visa-Versa)

2020-11-05 Thread Jack Winch
Hey Greg, > I think you should be talking to hardware people about this, as this is > almost always due to hardware limitations/issues/design decisions. To be honest, I anticipated a response along these lines (after briefly speaking to another individual on this matter). They commented on how

Re: PCI / PCIe Device Memory - Rationale for Choosing MMIO Over PMIO (and Visa-Versa)

2020-11-05 Thread Greg KH
On Thu, Nov 05, 2020 at 02:27:58PM +, Jack Winch wrote: > Hi all, > > Over the last couple of months, I've been reading the hardware > documentation and Linux device driver source code for a range of > different PCI and PCIe devices. Those examined range from > multi-function data

PCI / PCIe Device Memory - Rationale for Choosing MMIO Over PMIO (and Visa-Versa)

2020-11-05 Thread Jack Winch
Hi all, Over the last couple of months, I've been reading the hardware documentation and Linux device driver source code for a range of different PCI and PCIe devices. Those examined range from multi-function data acquisition cards through to avionics bus interface devices. In doing so, I have