diff options
| author | Vineet Gupta <vgupta@synopsys.com> | 2014-03-31 14:52:09 +0400 |
|---|---|---|
| committer | Vineet Gupta <vgupta@synopsys.com> | 2014-06-03 12:50:09 +0400 |
| commit | e87a850b9c92be6a8cf5735c516ec864d65f24dd (patch) | |
| tree | 5121fa121b6bd6ce2d6dbed6eee0ac5c213d7fa0 /arch | |
| parent | c00bfd974fb0b7a5a501aebada2a94945e38a9a5 (diff) | |
| download | linux-e87a850b9c92be6a8cf5735c516ec864d65f24dd.tar.xz | |
ARC: [arcfpga] Early ARC UART to be only activated by cmdline
Earlier CONFIG_SERIAL_ARC_CONSOLE would unconditionally enable the
legacy ARC UART based early console even if platform lacked that UART
(e.g. nSIM OSCI platform).
So a multi-platform image containing the 2 UART drivers won't work.
Fix that by probing the driver only if "earlyprintk=ttyARC0" is present
in cmdline.
Reported-by: Chuck Jordan <cjordan@synopsys.com>
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arc/boot/dts/angel4.dts | 2 | ||||
| -rw-r--r-- | arch/arc/plat-arcfpga/platform.c | 13 |
2 files changed, 5 insertions, 10 deletions
diff --git a/arch/arc/boot/dts/angel4.dts b/arch/arc/boot/dts/angel4.dts index bcf662d21a57..5bb2fdaca02f 100644 --- a/arch/arc/boot/dts/angel4.dts +++ b/arch/arc/boot/dts/angel4.dts @@ -17,7 +17,7 @@ interrupt-parent = <&intc>; chosen { - bootargs = "console=ttyARC0,115200n8"; + bootargs = "console=ttyARC0,115200n8 earlyprintk=ttyARC0"; }; aliases { diff --git a/arch/arc/plat-arcfpga/platform.c b/arch/arc/plat-arcfpga/platform.c index f09e771b4bbd..61c7e5997387 100644 --- a/arch/arc/plat-arcfpga/platform.c +++ b/arch/arc/plat-arcfpga/platform.c @@ -79,16 +79,11 @@ static void arc_fpga_serial_init(void) ARRAY_SIZE(fpga_early_devs)); /* - * ARC console driver registers itself as an early platform driver - * of class "earlyprintk". - * Install it here, followed by probe of devices. - * The installation here doesn't require earlyprintk in command line - * To do so however, replace the lines below with - * parse_early_param(); - * early_platform_driver_probe("earlyprintk", 1, 1); - * ^^ + * ARC console driver registers (build time) as an early platform driver + * of class "earlyprintk". However it needs explicit cmdline toggle + * "earlyprintk=ttyARC0" to be successfuly runtime registered. + * Otherwise the early probe below fails to find the driver */ - early_platform_driver_register_all("earlyprintk"); early_platform_driver_probe("earlyprintk", 1, 0); /* |