On Tue, Jun 10, 2014 at 3:52 PM, Tony Luck <tony.luck@xxxxxxxxx> wrote: > On Mon, Jun 9, 2014 at 4:18 PM, Rob Herring <robherring2@xxxxxxxxx> wrote: >> It should do auto detect of the baud-rate if it is not specified which >> for 8250 is just reading the baud-rate divider and calculating the >> baud-rate using the uart clock. It should just reprogram the divider >> with the same divider value. I don't see anything obvious why this >> would have broken. > > Something very weird is happening. Output is good so long as I put the > trailing ",115200" on the command line. > > But I made early_serial8250_setup() printk() the return value it got > from probe_baud() - in case is was somehow getting 115201 or some > other silly value ... nope. Exactly 115200. > > I also can't explain why the "noise" comes and goes a dozen > times during boot, > > Does some other place in the kernel look at the "uart..." command > line argument? Would you be using drivers/firmware/pcdp.c as that is ia64 only? That shouldn't have an impact that I can see. Can you print the options string in serial8250_console_setup? Maybe it is getting lost when the real console is setup. Rob -- To unsubscribe from this list: send the line "unsubscribe linux-serial" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
