MIPS, ttyFDC: Add early FDC console support
Add support for early console of MIPS Fast Debug Channel (FDC) on
channel 1 with a call very early from the MIPS setup_arch().
Signed-off-by: James Hogan <james.hogan@imgtec.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Jiri Slaby <jslaby@suse.cz>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/9145/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
diff --git a/drivers/tty/Kconfig b/drivers/tty/Kconfig
index 39469ca..e0c18e5 100644
--- a/drivers/tty/Kconfig
+++ b/drivers/tty/Kconfig
@@ -437,4 +437,17 @@
If unsure, say N.
+config MIPS_EJTAG_FDC_EARLYCON
+ bool "Early FDC console"
+ depends on MIPS_EJTAG_FDC_TTY
+ help
+ This registers a console on FDC channel 1 very early during boot (from
+ MIPS arch code). This is useful for bring-up and debugging early boot
+ issues.
+
+ Do not enable unless there is a debug probe attached to drain the FDC
+ TX FIFO.
+
+ If unsure, say N.
+
endif # TTY