On Thu, Mar 17, 2022 at 5:15 AM Christian König <christian.koenig@xxxxxxx> wrote: > > Hi Peter, > > Am 17.03.22 um 01:14 schrieb Peter Geis: > > Good Evening, > > > > I apologize for raising this email chain from the dead, but there have > > been some developments that have introduced even more questions. > > I've looped the Rockchip mailing list into this too, as this affects > > rk356x, and likely the upcoming rk3588 if [1] is to be believed. > > > > TLDR for those not familiar: It seems the rk356x series (and possibly > > the rk3588) were built without any outer coherent cache. > > This means (unless Rockchip wants to clarify here) devices such as the > > ITS and PCIe cannot utilize cache snooping. > > well, as far as I know that is a clear violation of the PCIe specification. > > Coherent access to system memory is simply a must have.
