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>
interrupt-parent = <&intc>;
chosen {
interrupt-parent = <&intc>;
chosen {
- bootargs = "console=ttyARC0,115200n8";
+ bootargs = "console=ttyARC0,115200n8 earlyprintk=ttyARC0";
ARRAY_SIZE(fpga_early_devs));
/*
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);
/*
early_platform_driver_probe("earlyprintk", 1, 0);
/*