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 */
