1 files changed, 13 insertions, 1 deletions

diff --git a/arch/powerpc/kernel/head_64.S b/arch/powerpc/kernel/head_64.S
index dea8191253d2..06c7251c1bf7 100644
--- a/arch/powerpc/kernel/head_64.S
+++ b/arch/powerpc/kernel/head_64.S
@@ -53,7 +53,8 @@
  *   2. The kernel is entered at __start
  * -or- For OPAL entry:
  *   1. The MMU is off, processor in HV mode, primary CPU enters at 0
- *      with device-tree in gpr3
+ *      with device-tree in gpr3. We also get OPAL base in r8 and
+ *      entry in r9 for debugging purposes
  *   2. Secondary processors enter at 0x60 with PIR in gpr3
  *
  *  For iSeries:
@@ -335,6 +336,11 @@ _GLOBAL(__start_initialization_multiplatform)
         /* Save parameters */
         mr      r31,r3
         mr      r30,r4
+#ifdef CONFIG_PPC_EARLY_DEBUG_OPAL
+        /* Save OPAL entry */
+        mr      r28,r8
+        mr      r29,r9
+#endif
 
 #ifdef CONFIG_PPC_BOOK3E
         bl      .start_initialization_book3e
@@ -711,6 +717,12 @@ _INIT_STATIC(start_here_multiplatform)
         bdnz    3b
 4:
 
+#ifdef CONFIG_PPC_EARLY_DEBUG_OPAL
+        /* Setup OPAL entry */
+        std     r28,0(r11);
+        std     r29,8(r11);
+#endif
+
 #ifndef CONFIG_PPC_BOOK3E
         mfmsr   r6
         ori     r6,r6,MSR_RI