Hi Marcelo,
Despite your patch, I'm still having trouble getting my BDI2000 to translate
kernel virtual address to physical address on a 2.6.13 kernel.
What should I look for to make sure I set it up properly ?
Regards,
Guillaume.
Marcelo Tosatti wrote:
> Hi,
>
> Currently gdb over BDI (and I've seen other reports on this list) fails to
> translate virtual->physical addresses on PPC 8xx:
>
> *** MMU: address translation for 0xC000C66C failed
> *** MMU: address translation for 0xC000C66C failed
>
> Thats because the v2.6 kernel was changed to use physical addresses on the
> first level page.
>
> Dan informed me there might be a firmware update available to address
> this problem. Is this true?
>
> With the following the kernel stores the virtual address on the PMD
> getting the BDI "to work".
>
> A newer firmware would be much better though.
>
> --- linux-2.6.14-rc4.orig/arch/ppc/kernel/head_8xx.S 2005-10-18
> 16:59:34.000000000 -0500
> +++ linux-2.6.14-rc4/arch/ppc/kernel/head_8xx.S 2005-11-01
> 05:45:00.000000000 -0600
> @@ -320,11 +320,12 @@ InstructionTLBMiss:
> lwz r11, 0(r10) /* Get the level 1 entry */
> rlwinm. r10, r11,0,0,19 /* Extract page descriptor page address */
> beq 2f /* If zero, don't try to find a pte */
> + tophys(r11,r11)
>
> /* We have a pte table, so load the MI_TWC with the attributes
> * for this "segment."
> */
> - ori r11,r11,1 /* Set valid bit */
> + /*ori r11,r11,1 Set valid bit */
> DO_8xx_CPU6(0x2b80, r3)
> mtspr SPRN_MI_TWC, r11 /* Set segment attributes */
> DO_8xx_CPU6(0x3b80, r3)
> @@ -379,6 +380,7 @@ DataStoreTLBMiss:
> lwz r11, 0(r10) /* Get the level 1 entry */
> rlwinm. r10, r11,0,0,19 /* Extract page descriptor page address */
> beq 2f /* If zero, don't try to find a pte */
> + tophys(r11,r11)
>
> /* We have a pte table, so load fetch the pte from the table.
> */
> @@ -493,6 +495,7 @@ DataTLBError:
> lwz r11, 0(r10) /* Get the level 1 entry */
> rlwinm. r10, r11,0,0,19 /* Extract page descriptor page address */
> beq 2f /* If zero, bail */
> + tophys(r11,r11)
>
> /* We have a pte table, so fetch the pte from the table.
> */
> diff -Nur -p --exclude-from=linux-2.6.14-rc4/Documentation/dontdiff
> linux-2.6.14-rc4.orig/include/asm-ppc/pgalloc.h
> linux-2.6.14-rc4/include/asm-ppc/pgalloc.h
> --- linux-2.6.14-rc4.orig/include/asm-ppc/pgalloc.h 2005-10-18
> 17:00:09.000000000 -0500
> +++ linux-2.6.14-rc4/include/asm-ppc/pgalloc.h 2005-11-01
> 08:02:08.000000000 -0600
> @@ -19,16 +19,16 @@ extern void pgd_free(pgd_t *pgd);
> #define __pmd_free_tlb(tlb,x) do { } while (0)
> #define pgd_populate(mm, pmd, pte) BUG()
>
> -#ifndef CONFIG_BOOKE
> +#if defined(CONFIG_BOOKE) || defined(CONFIG_8xx)
> #define pmd_populate_kernel(mm, pmd, pte) \
> - (pmd_val(*(pmd)) = __pa(pte) | _PMD_PRESENT)
> + (pmd_val(*(pmd)) = (unsigned long)pte | _PMD_PRESENT)
> #define pmd_populate(mm, pmd, pte) \
> - (pmd_val(*(pmd)) = (page_to_pfn(pte) << PAGE_SHIFT) |
> _PMD_PRESENT)
> + (pmd_val(*(pmd)) = (unsigned long)page_to_virt(pte) |
> _PMD_PRESENT)
> #else
> #define pmd_populate_kernel(mm, pmd, pte) \
> - (pmd_val(*(pmd)) = (unsigned long)pte | _PMD_PRESENT)
> + (pmd_val(*(pmd)) = __pa(pte) | _PMD_PRESENT)
> #define pmd_populate(mm, pmd, pte) \
> - (pmd_val(*(pmd)) = (unsigned long)page_to_virt(pte) |
> _PMD_PRESENT)
> + (pmd_val(*(pmd)) = (page_to_pfn(pte) << PAGE_SHIFT) |
> _PMD_PRESENT)
> #endif
>
> extern pte_t *pte_alloc_one_kernel(struct mm_struct *mm, unsigned long addr);
> diff -Nur -p --exclude-from=linux-2.6.14-rc4/Documentation/dontdiff
> linux-2.6.14-rc4.orig/include/asm-ppc/pgtable.h
> linux-2.6.14-rc4/include/asm-ppc/pgtable.h
> --- linux-2.6.14-rc4.orig/include/asm-ppc/pgtable.h 2005-10-18
> 17:00:09.000000000 -0500
> +++ linux-2.6.14-rc4/include/asm-ppc/pgtable.h 2005-11-01
> 08:01:34.000000000 -0600
> @@ -719,16 +719,16 @@ extern pgprot_t phys_mem_access_prot(str
> * handler). On everything else the pmd contains the physical address
> * of the pte page. -- paulus
> */
> -#ifndef CONFIG_BOOKE
> +#if defined (CONFIG_BOOKE) || defined CONFIG_8xx
> #define pmd_page_kernel(pmd) \
> - ((unsigned long) __va(pmd_val(pmd) & PAGE_MASK))
> + ((unsigned long) (pmd_val(pmd) & PAGE_MASK))
> #define pmd_page(pmd) \
> - (mem_map + (pmd_val(pmd) >> PAGE_SHIFT))
> + (mem_map + (__pa(pmd_val(pmd)) >> PAGE_SHIFT))
> #else
> #define pmd_page_kernel(pmd) \
> - ((unsigned long) (pmd_val(pmd) & PAGE_MASK))
> + ((unsigned long) __va(pmd_val(pmd) & PAGE_MASK))
> #define pmd_page(pmd) \
> - (mem_map + (__pa(pmd_val(pmd)) >> PAGE_SHIFT))
> + (mem_map + (pmd_val(pmd) >> PAGE_SHIFT))
> #endif
>
> /* to find an entry in a kernel page-table-directory */
>
>
>
>
>
>
>
>
> _______________________________________________
> Linuxppc-embedded mailing list
> Linuxppc-embedded at ozlabs.org
> https://ozlabs.org/mailman/listinfo/linuxppc-embedded
>
--
=======================================
Guillaume Autran
Senior Software Engineer
MRV Communications, Inc.
Tel: (978) 952-4932 office
=======================================
