Changeset 7d5077c in rtems

Timestamp:

07/24/00 19:18:42 (23 years ago)

Author:

Joel Sherrill <joel.sherrill@…>

Branches:

4.10, 4.11, 4.8, 4.9, 5, master

Children:

3c51181

Parents:

14b35d47

Message:

Patch from Eric Valette <valette@…> with debugging
by Till Straumann <strauman@…>. With this
patch, the motorola_shared BSP should also support the MVME2303.

File:

• c/src/lib/libbsp/powerpc/shared/start/start.S (modified) (2 diffs)

c/src/lib/libbsp/powerpc/shared/start/start.S

@@ -79 +79 @@
 
 /*
- * we now have the 1st 64M of ram mapped with the bats.
+ * we now have the 1st 64M of ram mapped with the bats. We are still 
+ * running on the bootloader stack and cannot switch to an RTEMS allocated 
+ * init stack before copying the residual data that may have been set just after
+ * rtems_end address. This bug has been experienced on MVME2304. Thank to
+ * Till Straumann <strauman@SLAC.Stanford.EDU> for hunting it and suggesting 
+ * the appropriate code.
  */
         
 enter_C_code:
         bl      MMUon
-        /*
-         * stack = &__rtems_end + 4096
-         */
-        addis   r9,r0, __rtems_end+(4096-CPU_MINIMUM_STACK_FRAME_SIZE)@ha
-        addi    r9,r9, __rtems_end+(4096-CPU_MINIMUM_STACK_FRAME_SIZE)@l
-        mr      r1, r9
         bl      zero_bss
         /*
@@ -100 +99 @@
         mr      r7,r27 
         bl      save_boot_params
+        /*
+         * stack = &__rtems_end + 4096
+         */
+        addis   r9,r0, __rtems_end+(4096-CPU_MINIMUM_STACK_FRAME_SIZE)@ha
+        addi    r9,r9, __rtems_end+(4096-CPU_MINIMUM_STACK_FRAME_SIZE)@l
+        mr      r1, r9
+        /*
+         * We are know in a environment that is totally independent from bootloader setup.
+         */
         bl      boot_card
         bl      _return_to_ppcbug