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RE: [PATCH][MIPS][5/6]: AR7: serial hack

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Subject: RE: [PATCH][MIPS][5/6]: AR7: serial hack
From: "Nico Coesel" <>
Date: Tue, 18 Mar 2008 16:40:23 +0100
Original-recipient: rfc822;
Thread-index: AciJAs+MVV6DKv8GQWiw9FA8wJZFjgACykIw
Thread-topic: [PATCH][MIPS][5/6]: AR7: serial hack
Hello all,
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: 
> [] Namens Alan Cox
> Verzonden: dinsdag 18 maart 2008 15:02
> Aan: Thomas Bogendoerfer
> CC: Matteo Croce;; Florian 
> Fainelli; Felix Fietkau; Nicolas Thill; 
>; 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.

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