Can't set serial console line speed higher than default

[John Hagen]

Hi all,

I've been trying to set my serial console line speed on a FreeBSD
4.7-RELEASE installation on a Dell P200 Optiplex GXi PC higher than the
default 9600 baud with a VT520 terminal. I am using the single serial
port on the system mainboard.

I am having no luck at all increasing line speed during boot or running
getty later, though using 9600 baud on PC and terminal works fine for
everything, though it's a little slow.

Here's what I did:

Per the Handbook (printed copy, section 15.6.2 and 15.6.4), I initially
set the ttyd0 line in /etc/ttys to the following to get a login prompt:

ttyd0  "/usr/libexec/getty std.9600"  vt520 on secure

With this option set, "-h" in /boot.config and a "kill -1 1" sent to
init I get boot messages sent to the terminal and subsequently a login
prompt. All works fine, I can log in and do work. Then I changed
/etc/ttys to the following:

ttyd0  "/usr/libexec/getty std.38400"  vt520 on secure

After changing the terminal config to use a 38400 baud send and receive
speed, kicking init and resetting the terminal, I just get garbage on
the screen (upside down question marks, etc).

The terminal is set to 8 bits, no parity, 1 stop bit and XON/XOFF flow
control in full duplex mode. I then attempted to recompile a kernel that
would allow a higher line speed.

I set the following in my kernel build config file:

device     sio0   at isa? port IO_COM1 flags 0x10 irq 4 options
CONSPEED=38400

I recompiled and installed the kernel the tradional way (w/o using
buildkernel). I rebooted and cannot get anything but garbage on the
terminal with the terminal's line speed set any higher than 9600 baud. I
rebooted and added the following to /etc/make.conf:

BOOT_COMCONSOLE_SPEED=38400

Then I ran through a kernel rebuild, install and reboot with no luck and
still garbage on the screen. Then I noticed that the Handbook recommends
to rebuild the boot blocks in certain cases, so I tried that as well. I
tried running a make in /sys/boot/i386/boot2 and I get:

/usr/libexec/elf/ld: cannot open
/usr/sys/src/boot/i386/boot/../btx/crt0.o: No such file or directory 
*** Error code 1

I went to /usr/sys/src/boot/i386/btx/lib and sure enough, crt0.o is
missing.

At this point, I have no idea what else to try. How can I increase my
serial line speed correctly?

TIA,

-- 
john hagen ~ jhagen <at> haushagen.org
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