Date: Thu, 06 Feb 1997 13:42:12 -0800 From: Paul Traina <pst@jnx.com> To: Terry Lambert <terry@lambert.org> Cc: hackers@freebsd.org, bde@freebsd.org, rgrimes@freebsd.org Subject: Re: serial ports at 230k Message-ID: <199702062142.NAA00990@base.jnx.com> In-Reply-To: Your message of "Thu, 06 Feb 1997 14:31:48 MST." <199702062131.OAA17929@phaeton.artisoft.com>
next in thread | previous in thread | raw e-mail | index | archive | help
That's what I thought too, but everything I read suggests that no special hardware is actually necessary. I know the clock divisor goes to 0 at 115k, so I'm assuming that there's a clock multiplier somewhere else that can be kicked with relatively modern 550s. W95, with appropriate prodding, was happy to set my serial port speed to what it claimed was 230k. From: Terry Lambert <terry@lambert.org> Subject: Re: serial ports at 230k > Does anyone have any experience with running 16550A's at 230kbps > under FreeBSD? > > Yes, I know, the driver doesn't support it currently, but has anyone > played? The hardware doesn't support it, unless you changeout your clock crystal (assuming it isn't using an on-board clock generator in an ASIC containing it and the UART both). All the driver does is translate manifest conatants to bit patterns, so it doesn't care if B300 (for instance) really makes the UART go into 300 baud mode or not. 8-). Terry Lambert terry@lambert.org --- Any opinions in this posting are my own and not those of my present or previous employers.
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?199702062142.NAA00990>