I didn't follow the entire discussion, but I might have similar problems
on the AU1100 SoC. The AU1100 also has 16550 style serial ports. The
serial console doesn't work even though I specify console=/dev/ttyS0 on
the kernel command line. Once a getty is started, the serial port is
active and working fine.
> -----Oorspronkelijk bericht-----
> Van: email@example.com
> [mailto:firstname.lastname@example.org] Namens Alan Cox
> Verzonden: dinsdag 18 maart 2008 15:02
> Aan: Thomas Bogendoerfer
> CC: Matteo Croce; email@example.com; Florian
> Fainelli; Felix Fietkau; Nicolas Thill;
> firstname.lastname@example.org; Andrew Morton
> Onderwerp: Re: [PATCH][MIPS][5/6]: AR7: serial hack
> > Is there a good reason, why we don't check for BOTH_EMPTY in
> > serial8250_console_putchar() ? To match the 2.6.10 behaviour we
> A very good one - we have at least 1 byte of FIFO and the
> serial-ethernet magic console devices also use that fifo
> emptying entirely to deduce when to send a new packet.
> > would need that and this would fix the AR7 case without any special
> > handling.
> If the AR7 is an 8250 why does it need special handling? and
> indeed why does serial work on it except for console - or
> does that fail too.