From 44a4ed42576da5f3387005a1667cb3e7aedfd687 Mon Sep 17 00:00:00 2001 From: Tobias Klauser Date: Sun, 2 Apr 2017 20:09:04 -0700 Subject: nios2: enable earlycon support Enable generic earlycon support for nios2. This e.g. allows to use a 8250/16650 UART as earlycon. In order to get the earlycon, we just need to call parse_early_param() in early_init_devtree() as soon as the device tree is initially scanned. By adding an stdout-path property to the dts (done in this patch for 10m50_devboard), the earlycon can be used. In order to provide early printk support, we need to provide a dummy implementation of early_console_write(), so that arch/nios2/kernel/early_printk.c can still be compiled if neither SERIAL_ALTERA_JTAGUART_CONSOLE nor SERIAL_ALTERA_UART_CONSOLE is selected. As soon as the altera_uart and altera_jtaguart support earlycon, the entire file can be removed. Tested-by: Guenter Roeck Signed-off-by: Tobias Klauser Acked-by: Ley Foon Tan --- arch/nios2/kernel/setup.c | 2 ++ 1 file changed, 2 insertions(+) (limited to 'arch/nios2/kernel/setup.c') diff --git a/arch/nios2/kernel/setup.c b/arch/nios2/kernel/setup.c index 6044d9be28b4..8b5146082e3e 100644 --- a/arch/nios2/kernel/setup.c +++ b/arch/nios2/kernel/setup.c @@ -137,6 +137,8 @@ asmlinkage void __init nios2_boot_init(unsigned r4, unsigned r5, unsigned r6, strncpy(boot_command_line, CONFIG_CMDLINE, COMMAND_LINE_SIZE); #endif #endif + + parse_early_param(); } void __init setup_arch(char **cmdline_p) -- cgit