Re: [PATCH] serial: Add a debug console using the RISC-V SBI interface

On Sun, Sep 12, 2021 at 11:56 PM Samuel Holland samuel@sholland.org wrote:

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 samuel@sholland.org

drivers/serial/Kconfig | 10 ++++++++++ drivers/serial/Makefile | 1 + drivers/serial/serial_sbi.c | 16 ++++++++++++++++ 3 files changed, 27 insertions(+) create mode 100644 drivers/serial/serial_sbi.c

Reviewed-by: Bin Meng bmeng.cn@gmail.com