[POWERPC] Early serial debug support for PPC44x

This adds support for early serial debugging via the built in
port on IBM/AMCC PowerPC 44x CPUs.  It uses a bolted TLB entry in
address space 1 for the UART's mapping, allowing robust debugging both
before and after the initialization of the MMU.

Signed-off-by: David Gibson <dwg@au1.ibm.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>

1 files changed, 18 insertions, 4 deletions

diff --git a/arch/powerpc/Kconfig.debug b/arch/powerpc/Kconfig.debug
index 86aa3745af7f..f70e795c262e 100644
--- a/arch/powerpc/Kconfig.debug
+++ b/arch/powerpc/Kconfig.debug
@@ -139,10 +139,6 @@ config BOOTX_TEXT
           Say Y here to see progress messages from the boot firmware in text
           mode. Requires either BootX or Open Firmware.
 
-config SERIAL_TEXT_DEBUG
-        bool "Support for early boot texts over serial port"
-        depends on 4xx
-
 config PPC_EARLY_DEBUG
         bool "Early debugging (dangerous)"
 
@@ -207,6 +203,24 @@ config PPC_EARLY_DEBUG_BEAT
         help
           Select this to enable early debugging for Celleb with Beat.
 
+config PPC_EARLY_DEBUG_44x
+        bool "Early serial debugging for IBM/AMCC 44x CPUs"
+        depends on 44x
+        select PPC_UDBG_16550
+        help
+          Select this to enable early debugging for IBM 44x chips via the
+          inbuilt serial port.
+
 endchoice
 
+config PPC_EARLY_DEBUG_44x_PHYSLOW
+        hex "Low 32 bits of early debug UART physical address"
+        depends PPC_EARLY_DEBUG_44x
+        default "0x40000200"
+
+config PPC_EARLY_DEBUG_44x_PHYSHIGH
+        hex "EPRN of early debug UART physical address"
+        depends PPC_EARLY_DEBUG_44x
+        default "0x1"
+
 endmenu