> From: Jean-Philippe Brucker <jean-philippe@xxxxxxxxxx> > Sent: Thursday, September 30, 2021 6:33 PM > > The PTE flags define whether the memory access is cache-coherent or not. > * WB is cacheable (short for write-back cacheable. Doesn't matter here > what OI or RWA mean.) > * NC is non-cacheable. > > | Normal PCI access | No_snoop PCI access > -------+-------------------+------------------- > PTE WB | Cacheable | Non-cacheable > PTE NC | Non-cacheable | Non-cacheable This implies that PCI no-snoop supersedes PTE flags when it's supported by the system?
