diff options
| author | Heinrich Schuchardt <heinrich.schuchardt@canonical.com> | 2023-09-04 14:24:04 +0300 |
|---|---|---|
| committer | Leo Yu-Chi Liang <ycliang@andestech.com> | 2023-09-05 05:53:55 +0300 |
| commit | dfe08374943c0e898fcfaf7327f69e0fb56b7d23 (patch) | |
| tree | dba6f74cca2f0eb5726d838795b08fe87c7276bd | |
| parent | d14222e7c152e36bf7d370c2623242a22fb9e821 (diff) | |
| download | u-boot-dfe08374943c0e898fcfaf7327f69e0fb56b7d23.tar.xz | |
risc-v: implement DBCN based debug console
Use the DBCN SBI extension to implement a debug console.
Make it the default for S-mode RISC-V.
Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
Reviewed-by: Leo Yu-Chi Liang <ycliang@andestech.com>
| -rw-r--r-- | drivers/serial/Kconfig | 5 | ||||
| -rw-r--r-- | drivers/serial/serial_sbi.c | 20 |
2 files changed, 24 insertions, 1 deletions
diff --git a/drivers/serial/Kconfig b/drivers/serial/Kconfig index a1e089962a..8c54bc9c47 100644 --- a/drivers/serial/Kconfig +++ b/drivers/serial/Kconfig @@ -218,6 +218,7 @@ config DEBUG_UART choice prompt "Select which UART will provide the debug UART" depends on DEBUG_UART + default DEBUG_SBI_CONSOLE if RISCV_SMODE default DEBUG_UART_NS16550 config DEBUG_UART_ALTERA_JTAGUART @@ -289,11 +290,13 @@ config DEBUG_EFI_CONSOLE config DEBUG_SBI_CONSOLE bool "SBI" - depends on SBI_V01 + depends on RISCV_SMODE help Select this to enable a debug console which calls back to SBI to output to the console. This can be useful for early debugging of U-Boot when running on top of SBI (Supervisor Binary Interface). + This implementation of the debug UART is not available while in + M-mode (e.g. during SPL). config DEBUG_UART_S5P bool "Samsung S5P" diff --git a/drivers/serial/serial_sbi.c b/drivers/serial/serial_sbi.c index b9f35ed36e..a51a96c1ef 100644 --- a/drivers/serial/serial_sbi.c +++ b/drivers/serial/serial_sbi.c @@ -3,6 +3,8 @@ #include <debug_uart.h> #include <asm/sbi.h> +#ifdef CONFIG_SBI_V01 + static inline void _debug_uart_init(void) { } @@ -13,4 +15,22 @@ static inline void _debug_uart_putc(int c) sbi_console_putchar(c); } +#else + +static int sbi_dbcn_available; + +static inline void _debug_uart_init(void) +{ + if (CONFIG_IS_ENABLED(RISCV_SMODE)) + sbi_dbcn_available = sbi_probe_extension(SBI_EXT_DBCN); +} + +static inline void _debug_uart_putc(int ch) +{ + if (CONFIG_IS_ENABLED(RISCV_SMODE) && sbi_dbcn_available) + sbi_dbcn_write_byte(ch); +} + +#endif + DEBUG_UART_FUNCS |