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41f7be733 serial: Add a debug console using the RISC-V SBI interface ... Browse Code »

The RISC-V SBI interface v0.1 provides a function for printing a
character to the console. Even though SBI v0.1 functions are deprecated,
the SBI console is quite useful for early debugging, because it works
without any dcache, memory, or MMIO access in S mode.

Signed-off-by: Samuel Holland
Reviewed-by: Sean Anderson
Reviewed-by: Bin Meng

Samuel Holland
2021-10-07 16:08:23 +0800

serial_sbi.c 259 Bytes

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// SPDX-License-Identifier: GPL-2.0+

#include <debug_uart.h>
#include <asm/sbi.h>

static inline void _debug_uart_init(void)
{
}

static inline void _debug_uart_putc(int c)
{
	if (CONFIG_IS_ENABLED(RISCV_SMODE))
		sbi_console_putchar(c);
}

DEBUG_UART_FUNCS