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Commit e87a850b authored by Vineet Gupta's avatar Vineet Gupta
Browse files

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: default avatarChuck Jordan <cjordan@synopsys.com>
Signed-off-by: default avatarVineet Gupta <vgupta@synopsys.com>
parent c00bfd97

arch/arc/boot/dts/angel4.dts

+1 −1
Original line number Diff line number Diff line
@@ -17,7 +17,7 @@ 
	interrupt-parent = <&intc>;



	chosen {

		bootargs = "console=ttyARC0,115200n8";

		bootargs = "console=ttyARC0,115200n8 earlyprintk=ttyARC0";

	};



	aliases {

arch/arc/plat-arcfpga/platform.c

+4 −9
Original line number Diff line number Diff line
@@ -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);



	/*