On Tue, 2016-05-24 at 12:48 +0200, Christian Zigotzky wrote:
> Ben,
>
> Thanks for the hint. I'm sorry I don't know how pgprot_noncached()
> works.
>
> I tried:
>
> 1) range.size, pgprot_noncached()
>
> 2) range.size, pgprot_val(pgprot_noncached(__pgprot(0))));
Hrm... The above is what is used elsewhere, I'm not sure what's wrong.
Aneesh, any idea ?
Michael, does it work on our PA-Semi board ? (DO we have that
southbridge on it ?)
Actually, can you try pgprot_noncached(PAGE_KERNEL) ? If that works,
then I wonder what that's going on in pci_64.c ...
Cheers,
Ben.
> 3) range.size, pgprot_val(pgprot_noncached_wc(__pgprot(0))));
>
> Unfortunately without any success.
>
> I'd like to modify the following code for the ATi SB600 southbridge
> chipset:
>
> /* Workaround for lack of device tree */
> if (primary) {
> __ioremap_at(range.cpu_addr, (void
> *)ISA_IO_BASE,
> range.size,
> _PAGE_NO_CACHE|_PAGE_GUARDED);
> hose->io_base_virt = (void
> *)_IO_BASE;
> printk("Initialised io_base_virt
> 0x%lx
> _IO_BASE 0x%llx\n", (unsigned long)hose->io_base_virt, (unsigned
> long
> long)_IO_BASE);
> }
>
> This workaround works with the kernel 4.6 final. After the commit
> powerpc-4.7-1, the computer doesn't boot anymore.
>
> Last message in the CFE firmware:
>
> Booting Linux via __start()...
>
> Cheers,
>
> Christian
>
>
> On 23 May 2016 at 10:01 AM, Benjamin Herrenschmidt wrote:
> >
> > On Mon, 2016-05-23 at 06:38 +0200, Christian Zigotzky wrote:
> > >
> > > Hi All,
> > >
> > > You removed PAGE_GUARDED in the commit
> > >
> > > https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/c
> > > ommi
> > > t/?id=c04a5880299eab3da8c10547db96ea9cdffd44a6
> > >
> > > We use
> > >
> > > range.size, _PAGE_NO_CACHE|_PAGE_GUARDED);
> > >
> > > This doesn't work anymore. What can we use instead?
> > You should just use pgprot_noncached()
> >
> > Cheers,
> > Ben.
> >
> >
_______________________________________________
Linuxppc-dev mailing list
Linuxppc-dev@lists.ozlabs.org
https://lists.ozlabs.org/listinfo/linuxppc-dev
