linux-kernel - RE: tty/serial: Need clarification on Support for 4+M Baudrate

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Thu, 12 Jan 2012 10:49:38 +0100
From:	Rajanikanth H V <rajanikanth.hv@...ricsson.com>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	"linux-serial@...r.kernel.org" <linux-serial@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"gregkh@...e.de" <gregkh@...e.de>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Rajanikanth H V <rajanikanth.hv@...ricsson.com>
Subject: RE: tty/serial: Need clarification on Support for 4+M Baudrate

Alan,

Thanks for your response, suggested modification helped to get 4.8M baud
but not 4.05M as this is being approximated to 4.0M baud which happens in
tty_termios_encode_baud_rate(...).

I have precise and weird requirement to get 4.05M baud as uart
baud clock divisor value changes between 4.0M and 4.05M Baud.

Any suggestion?

Thanks,
Rajanikanth

-----Original Message-----
From: Alan Cox [mailto:alan@...rguk.ukuu.org.uk] 
Sent: Wednesday, January 11, 2012 6:00 PM
To: Rajanikanth H V
Cc: linux-serial@...r.kernel.org; linux-kernel@...r.kernel.org; gregkh@...e.de; linux-arm-kernel@...ts.infradead.org
Subject: Re: tty/serial: Need clarification on Support for 4+M Baudrate

On Wed, 11 Jan 2012 17:49:01 +0530
> I have a requirement to interface UART with an external microcontroller 
> using baud rate above 4Mbps, hence following is my approach to apply
> the changes. Can any one review/provide me appropriate approach.

See TCGETS2/TCSETS2 and the BOTHER flag.

The kernel supports aetting arbitary baud rates already.

Alan
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/