1 files changed, 46 insertions, 0 deletions

diff --git a/arch/blackfin/Kconfig b/arch/blackfin/Kconfig
index cdce8cc5b7b..26ebb0e8c43 100644
--- a/arch/blackfin/Kconfig
+++ b/arch/blackfin/Kconfig
@@ -521,6 +521,52 @@ config BFIN_IDLE_LED_NUM
         help
           Select the LED (marked on the board) for you to blink.
 
+choice
+        prompt "Blackfin Exception Scratch Register"
+        default BFIN_SCRATCH_REG_RETN
+        help
+          Select the resource to reserve for the Exception handler:
+            - RETN: Non-Maskable Interrupt (NMI)
+            - RETE: Exception Return (JTAG/ICE)
+            - CYCLES: Performance counter
+
+          If you are unsure, please select "RETN".
+
+config BFIN_SCRATCH_REG_RETN
+        bool "RETN"
+        help
+          Use the RETN register in the Blackfin exception handler
+          as a stack scratch register.  This means you cannot
+          safely use NMI on the Blackfin while running Linux, but
+          you can debug the system with a JTAG ICE and use the
+          CYCLES performance registers.
+
+          If you are unsure, please select "RETN".
+
+config BFIN_SCRATCH_REG_RETE
+        bool "RETE"
+        help
+          Use the RETE register in the Blackfin exception handler
+          as a stack scratch register.  This means you cannot
+          safely use a JTAG ICE while debugging a Blackfin board,
+          but you can safely use the CYCLES performance registers
+          and the NMI.
+
+          If you are unsure, please select "RETN".
+
+config BFIN_SCRATCH_REG_CYCLES
+        bool "CYCLES"
+        help
+          Use the CYCLES register in the Blackfin exception handler
+          as a stack scratch register.  This means you cannot
+          safely use the CYCLES performance registers on a Blackfin
+          board at anytime, but you can debug the system with a JTAG
+          ICE and use the NMI.
+
+          If you are unsure, please select "RETN".
+
+endchoice
+
 #
 # Sorry - but you need to put the hex address here -
 #