[POWERPC] Add udbg support for RTAS console

Add udbg hooks for the RTAS console, based on the RTAS put-term-char
and get-term-char calls. Along with my previous patches, this should
enable debugging as soon as early_init_dt_scan_rtas() is called.

Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
Signed-off-by: Paul Mackerras <paulus@samba.org>

1 files changed, 4 insertions, 0 deletions

diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index c5e01c4b637d..deea4c8e1f4e 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -420,6 +420,10 @@ config PPC_IBM_CELL_BLADE
         select MMIO_NVRAM
         select PPC_UDBG_16550
 
+config UDBG_RTAS_CONSOLE
+        bool
+        default n
+
 config XICS
         depends on PPC_PSERIES
         bool