On Sat, 2 Jan 2016 18:35:08 +0000 "Wiles, Keith" <keith.wiles at intel.com> wrote:
> >Yes, DPDK needs to work in embedded environments with device tree. > >Would it be possible reimplement device tree parsing in user space? > >Ideally with a shared code from kernel?? > > Stephen, Do you mean we have to add kernel code to support DPDK on SoC > Platforms? If that is the case I would like to not require code be added to > the kernel to support DPDK. We will need a kernel module. But this is not necessarily related to the device-tree parsing. > > > >On a pratical level, the new SoC support must be optional > >(via DPDK config infrastructure), since most architectures won't be using it. > >In most cases, it is better from usability if everything is runtime based, > >but with SoC this is a platform/architecture configuration. > > I am not sure I agree with the optional support, as it could be stated that > PCI support is optional on SoC platforms. It would be best to not treat SoC > support as special compared to PCI support. Other then extra footprint it > does not seem reasonable to require SoC support to be ifdef?ed in the code. > Plus adding more ifdefs is not a good testing solution. This is a matter of preserving ABI. Turning PCI-support to be optional seems to be a difficult step at the moment. > > Can we detect somehow we are on a system with SoC support or even a system > that supports PCI for that matter? IMO, we can detect two things: "PCI is present on the system" and "Device tree is accessible in /proc/device-tree". Is this acceptable? -- Jan Viktorin E-mail: Viktorin at RehiveTech.com System Architect Web: www.RehiveTech.com RehiveTech Brno, Czech Republic
