On Tue, 23 Sep 2008 16:41:49 -0500 "Ayman El-Khashab" <[EMAIL PROTECTED]> wrote:
> Greetings, > > I am developing an app that needs to map pci address space to the PLB on > the ppc460ex. From what I gather I need to use the mtcdr > instruction/macro to configure the PIM0 space. However, I cannot figure > out how to use that from userland code. Is it possible? Normally, no. The mtdcr/mfdcr instructions are privileged instructions. On that particular core though, there are userspace dcr instructions. They are mtdcrux/mfdcrux instructions documented in the CPU manual. You will have to hard code them, as there are no versions of binutils that I know of that will emit the userspace dcr instructions. > Can I change the PIM some other way? Yes, write a proper driver. josh _______________________________________________ Linuxppc-embedded mailing list Linuxppc-embedded@ozlabs.org https://ozlabs.org/mailman/listinfo/linuxppc-embedded
