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))));
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/commi
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.
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