On Wed, 9 Jan 2019 at 12:35, Simon Goldschmidt <[email protected]> wrote: > > If _debug_uart_putc() is called before _debug_uart_init(), the > ns16550 debug uart driver hangs in a tight loop waiting for the > tx FIFO to get empty. > > As this can happen via a printf sneaking in before the port calls > debug_uart_init(), introduce a config option to ignore characters > before the debug uart is initialized. > > This is done by reading the baudrate divisor and aborting if is zero. > > The Kconfig option is required as reading the baudrate divisor does > not seem to work for all ns16500 compatibles (which is why the last > attempt on this has been reverted in 1a67969a99). > > Tested on socfpga_cyclone5_socrates. > > Signed-off-by: Simon Goldschmidt <[email protected]> > --- > > drivers/serial/Kconfig | 12 ++++++++++++ > drivers/serial/ns16550.c | 20 ++++++++++++++++++-- > 2 files changed, 30 insertions(+), 2 deletions(-)
Reviewed-by: Simon Glass <[email protected]> _______________________________________________ U-Boot mailing list [email protected] https://lists.denx.de/listinfo/u-boot
