Aneesh, I understand what you mean. I tried
range.size, pgprot_val(pgprot_noncached(__pgprot(0)))); a few days ago. It compiled but the kernel doesn't boot. Cheers, Christian On 25 May 2016 at 08:58 AM, Christian Zigotzky wrote:
Aneesh, Thank you for your help. I tried /* Workaround for lack of device tree */ if (primary) {__ioremap_at(range.cpu_addr, (void *)ISA_IO_BASE,range.size, HPTE_R_C | HPTE_R_M); 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);} Unfortunately the kernel doesn't boot. Cheers, Christian On 24 May 2016 at 5:37 PM, Aneesh Kumar K.V wrote:You can look at commit 72176dd0ad36c ("powerpc/mm: Use a helper for finding pte bits mapping I/O area") to find similar conversion we did. For ex: __ioremap_at(phb_io_base_phys, (void *)ISA_IO_BASE, size, _PAGE_NO_CACHE|_PAGE_GUARDED); gets replaced by __ioremap_at(phb_io_base_phys, (void *)ISA_IO_BASE, size, pgprot_val(pgprot_noncached(__pgprot(0)))); Now that gets mapped to the below hpte bits pte bit -> _PAGE_NON_IDEMPOTENT Which get converted in htab_convert_pte_flags(unsigned long pteflags) to if ((pteflags & _PAGE_CACHE_CTL ) == _PAGE_NON_IDEMPOTENT) rflags |= (HPTE_R_I | HPTE_R_G); BTW we default add (HPTE_R_C | HPTE_R_M ). Hence the final pte WIMG bits will be MIG. I guess that is what you wanted ? If that doesn't work, can you point me the current code so that I can look at it and suggest correct alternative. -aneesh
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