[POWERPC] 4xx: Add early udbg support for 40x processors

This adds some basic real mode based early udbg support for 40x
in order to debug things more easily

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Josh Boyer <jwboyer@linux.vnet.ibm.com>

1 files changed, 13 insertions, 0 deletions

diff --git a/arch/powerpc/Kconfig.debug b/arch/powerpc/Kconfig.debug
index d20ccf5f2ca9..179a453f7e04 100644
--- a/arch/powerpc/Kconfig.debug
+++ b/arch/powerpc/Kconfig.debug
@@ -227,6 +227,14 @@ config PPC_EARLY_DEBUG_44x
           Select this to enable early debugging for IBM 44x chips via the
           inbuilt serial port.
 
+config PPC_EARLY_DEBUG_40x
+        bool "Early serial debugging for IBM/AMCC 40x CPUs"
+        depends on 40x
+        help
+          Select this to enable early debugging for IBM 40x chips via the
+          inbuilt serial port. This works on chips with a 16550 compatible
+          UART. Xilinx chips with uartlite cannot use this option.
+
 config PPC_EARLY_DEBUG_CPM
         bool "Early serial debugging for Freescale CPM-based serial ports"
         depends on SERIAL_CPM
@@ -248,6 +256,11 @@ config PPC_EARLY_DEBUG_44x_PHYSHIGH
         depends on PPC_EARLY_DEBUG_44x
         default "0x1"
 
+config PPC_EARLY_DEBUG_40x_PHYSADDR
+        hex "Early debug UART physical address"
+        depends on PPC_EARLY_DEBUG_40x
+        default "0xef600300"
+
 config PPC_EARLY_DEBUG_CPM_ADDR
         hex "CPM UART early debug transmit descriptor address"
         depends on PPC_EARLY_DEBUG_CPM