On Fri, May 18, 2018 at 06:08:24PM +0300, Heikki Krogerus wrote: > > Rafael, the problem here with these Dell laptops is that a memory page > that is used as a mailbox for special communication between EC FW and > OS (called UCSI mailbox) should be in uncached memory, but the memory > is marked as cached. > > I'm actually not even sure if the cache mode is something that is set > based on information from ACPI tables, or is it something that the > BIOS handles separately? > > If it's information coming from ACPI tables, can we help pin point the > place the BIOS guys at Dell should fix? Given that Windows works with this same set of ACPI tables, perhaps the requirement isn't that this memory location be uncached? We shouldn't have to fix up ACPI tables just for Linux, we've been down that path before :( thanks, greg k-h -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
