linux-kernel - Re: Is 115200 still the maximum baudrate?

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Date:   Thu, 2 Nov 2017 13:13:55 -0400
From:   Theodore Ts'o <tytso@....edu>
To:     Paul Menzel <pmenzel+linux-serial@...gen.mpg.de>
Cc:     linux-serial@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: Is 115200 still the maximum baudrate?

On Thu, Nov 02, 2017 at 04:42:56PM +0100, Paul Menzel wrote:
> 
> The Linux serial console documentation [1] says that 115200 is the maximum
> supported baudrate.
> 
> > The maximum baudrate is 115200.
> 
> Is that still accurate? If yes, where should I look to support higher
> values?

See the setserial man page and the spd_* options:

spd_hi
    Use 57.6kb when the application requests 38.4kb. This parameter
    may be specified by a non-privileged user.
     
spd_vhi
    Use 115kb when the application requests 38.4kb. This parameter may
    be specified by a non-privileged user.
    
spd_shi
    Use 230kb when the application requests 38.4kb. This parameter may
    be specified by a non-privileged user.

spd_warp
    Use 460kb when the application requests 38.4kb. This parameter may
    be specified by a non-privileged user.

						- Ted