On Sun, Nov 08, 2009 at 09:04:51AM +0000, Russell King - ARM Linux wrote: > On Sat, Nov 07, 2009 at 08:03:05AM -0700, Matthew Wilcox wrote: > > I'm OK with this ... it might provoke bugs in some _other_ piece of hardware, > > but that seems pretty unlikely. > > Please remember that some ARM hardware only has the capability to read > and write full 32-bit quantities of configuration space, which means > writing the control register can result in the status register being > written as well. > > That shouldn't be a problem, but is merely something else to consider > which isn't obvious. Wow, that's horrid. You must have to special case each config register that's accessed in a 16-bit way, since some bits are 'preserve' and others are 'write 1 to clear'. What a nightmare. -- Matthew Wilcox Intel Open Source Technology Centre "Bill, look, we understand that you're interested in selling us this operating system, but compare it to ours. We can't possibly take such a retrograde step." -- 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
