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From: Mark Salter <msalter@redhat.com>
Date: Wed, 25 Mar 2015 14:17:50 -0400
Subject: [PATCH] arm64: avoid needing console= to enable serial console
Tell kernel to prefer one of the serial ports for console on
platforms currently supported (pl011 or 8250). console= on
command line will override these assumed preferences. This is
just a hack to get the behavior we want from DT provided by
firmware.
Signed-off-by: Mark Salter <msalter@redhat.com>
---
arch/arm64/kernel/setup.c | 19 +++++++++++++++++++
1 file changed, 19 insertions(+)
diff --git a/arch/arm64/kernel/setup.c b/arch/arm64/kernel/setup.c
index f3067d4d4e35..6f8d814c4e5c 100644
--- a/arch/arm64/kernel/setup.c
+++ b/arch/arm64/kernel/setup.c
@@ -568,3 +568,22 @@ const struct seq_operations cpuinfo_op = {
.stop = c_stop,
.show = c_show
};
+
+/*
+ * Temporary hack to avoid need for console= on command line
+ */
+static int __init arm64_console_setup(void)
+{
+ /* Allow cmdline to override our assumed preferences */
+ if (console_set_on_cmdline)
+ return 0;
+
+ if (IS_ENABLED(CONFIG_SERIAL_AMBA_PL011))
+ add_preferred_console("ttyAMA", 0, "115200");
+
+ if (IS_ENABLED(CONFIG_SERIAL_8250))
+ add_preferred_console("ttyS", 0, "115200");
+
+ return 0;
+}
+early_initcall(arm64_console_setup);
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