On Fri, 11 Jun 2010 10:43:27 -0700 "H. Peter Anvin" <hpa@xxxxxxxxx> wrote: > On 06/11/2010 02:20 AM, Kenji Kaneshige wrote: > > If the physical address is too high to be handled by ioremap() in > > x86_32 PAE (e.g. more than 36-bit physical address), ioremap() must > > return error (NULL). However, current x86 ioremap try to map this too > > high physical address, and it causes unexpected behavior. > > What unexpected behavior? It is perfectly legitimately to map such a > high address in PAE mode. We have a 36-bit kernel-imposed limit on > *RAM* in 32-bit mode (because we can't manage more than that), but there > is no reason it should apply to I/O. > I'm sorry for lack of study. How to access it via mapped area by ioremap() ? Thanks, -Kame -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
