diff options
Diffstat (limited to 'drivers/serial/serial_arc.c')
| -rw-r--r-- | drivers/serial/serial_arc.c | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/drivers/serial/serial_arc.c b/drivers/serial/serial_arc.c index e63d25d..55d0769 100644 --- a/drivers/serial/serial_arc.c +++ b/drivers/serial/serial_arc.c @@ -39,7 +39,23 @@ static void arc_serial_setbrg(void) arc_console_baud = gd->cpu_clk / (gd->baudrate * 4) - 1; writel(arc_console_baud & 0xff, ®s->baudl); + +#ifdef CONFIG_ARC + /* + * UART ISS(Instruction Set simulator) emulation has a subtle bug: + * A existing value of Baudh = 0 is used as a indication to startup + * it's internal state machine. + * Thus if baudh is set to 0, 2 times, it chokes. + * This happens with BAUD=115200 and the formaula above + * Until that is fixed, when running on ISS, we will set baudh to !0 + */ + if (gd->arch.running_on_hw) + writel((arc_console_baud & 0xff00) >> 8, ®s->baudh); + else + writel(1, ®s->baudh); +#else writel((arc_console_baud & 0xff00) >> 8, ®s->baudh); +#endif } static int arc_serial_init(void) |