PPC4xx: Minimal changes to add vxWorks support

Hi

I have to support vxWorks on our boards. In order to avoid changing the TLB in all PPC440x based boards I need this small patch. Can it go into the git repository or do I have to maintain it out of the tree forever?

Best regards

Signed-off-by Niklaus Giger <[email protected]>

---
 cpu/ppc4xx/start.S |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)

cpu/ppc4xx/start.S +0 -0

index 9626b65..8f19444 100644
@@ -1432,7 +1432,10 @@ relocate_code:
 	dccci	0,0			/* Invalidate data cache, now no longer our stack */

Quoted 3 lines

I have to support vxWorks on our boards. In order to avoid changing the TLB in all PPC440x based boards I need this small patch. Can it go into the git repository or do I have to maintain it out of the tree forever?

Quoted 13 lines

Best regards

Signed-off-by Niklaus Giger <[email protected]>

---
 cpu/ppc4xx/start.S |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)

cpu/ppc4xx/start.S +0 -0

index 9626b65..8f19444 100644
@@ -1432,7 +1432,10 @@ relocate_code:
 	dccci	0,0			/* Invalidate data cache, now no longer our stack */

cpu/ppc4xx/start.S relocate_code: · line 1441

Quoted 10 lines

cpu/ppc4xx/start.S +4 -1

 	sync
 	isync
-	addi	r1,r0,0x0000		/* TLB entry #0 */
+#ifndef CFG_TLB_FOR_BOOT_FLASH
+#define CFG_TLB_FOR_BOOT_FLASH 0
+#endif
+	addi	r1,r0,CFG_TLB_FOR_BOOT_FLASH	/* TLB entry (default #0) */
 	tlbre	r0,r1,0x0002		/* Read contents */
 	ori	r0,r0,0x0c00		/* Or in the inhibit, write through bit */
 	tlbwe	r0,r1,0x0002		/* Save it out */

Hi Niklaus,

I don't know the answer to your question, but the following alternate construct is cleaner (and cleaner may help get acceptance ;-):

#ifdef CFG_TLB_FOR_BOOT_FLASH
	addi	r1,r0,CFG_TLB_FOR_BOOT_FLASH	/* Use defined TLB */
#else
	addi	r1,r0,0x0000		/* Default TLB entry is #0 */

#endif