On Mon, 2017-03-13 at 17:10 +0100, Mason wrote: > Hello, > > There are two revisions of our PCI Express controller. > > Rev 1 did not support the following features: > > 1) legacy PCI interrupt delivery (INTx signals) I'm not sure about this... > 2) I/O address space But yes, definitely some support this. We're working on a new type of network controller that uses I/O for some types of low latency feature support. - Greg > > Internally, someone stated that such missing support would prevent > some PCIe cards from working with our controller. > > Are there really modern PCIe cards that require 1) and/or 2) > to function? > > Can someone provide examples of such cards, so that I may test them > on both revisions? > > I was told to check ath9k-based cards. Any other examples? > > Looking around, I came across this thread: > http://lists.infradead.org/pipermail/linux-arm-kernel/2016-March/418254.html > "i.MX6 PCIe: Fix imx6_pcie_deassert_core_reset() polarity" > > IIUC, although some PCIe boards do support MSI, the driver might not > put in the work to use that infrastructure, and instead reverts to > legacy interrupts. (So it is a SW issue, in a sense.) > > Regards.
