Hi-- On 5/31/23 01:17, Hongyu Xie wrote: > diff --git a/drivers/tty/serial/Kconfig b/drivers/tty/serial/Kconfig > index 3e3fb377d90d..70d0d2e4b827 100644 > --- a/drivers/tty/serial/Kconfig > +++ b/drivers/tty/serial/Kconfig > @@ -198,6 +198,31 @@ config SERIAL_KGDB_NMI > > If unsure, say N. > > +config PANIC_SERIAL_HELPER > + tristate "debug through uart after panic" UART > + depends on PANIC_TIMEOUT=0 > + select CONSOLE_POLL > + help > + This is a debug module that allows you to get all kernel logs > + after panic. > + > + Normally you need to attach a USB-to-UART tool or enable kdump > + before panic happens to get log from kernel after panic. If you > + didn't do that and kdump is not working, you can't get any log to > + know what happened before panic. If you have a USB-to-UART tool > + and the uart port on your computer is working, this module helps UART > + you to get all kernel log after panic() is called. > + > + This module uses serial port in poll mode, so it's more stable > + than other debugging methods. > + > + Read <file:Documentation/dev-tools/panic_serial_helper.rst> for > + usage. > + > + Say Y if you have an UART port that is working. If unsure, say N. > + Say M if you want add this as a module driver. > + The module will be called panic_serial_helper. thanks. -- ~Randy
