On Mar 23, 2007, at 9:49 PM, Mike Tancsa wrote:
Advertising
Hi,
I have a mini-pci UART that has a problem with its speed. When I
connect to it at 300bps the other side sees this as 1200. e.g.
Other PC PUC device
4800 1200
9600 2400
19200 4800
*snip*
I am guessing something needs to be changed in the puc driver for it ?
/* Oxford Semiconductor OX16PCI954 PCI UARTs */
{ "Oxford Semiconductor OX16PCI954 UARTs",
{ 0x1415, 0x9501, 0, 0 },
{ 0xffff, 0xffff, 0, 0 },
{
{ PUC_PORT_TYPE_COM, 0x10, 0x00, COM_FREQ },
{ PUC_PORT_TYPE_COM, 0x10, 0x08, COM_FREQ },
{ PUC_PORT_TYPE_COM, 0x10, 0x10, COM_FREQ },
{ PUC_PORT_TYPE_COM, 0x10, 0x18, COM_FREQ },
},
},
but what ?
Try changing the frequency from COM_FREQ to (4 * COM_FREQ). The
frequency is driving the baudrate generator and given that the
baudrate is off by a factor of 4, it follows that we program the
baudrate generator with a divisor that corresponds to a frequency
that's off by a factor of 4 as well.
HTH,
--
Marcel Moolenaar
[EMAIL PROTECTED]
_______________________________________________
freebsd-questions@freebsd.org mailing list
http://lists.freebsd.org/mailman/listinfo/freebsd-questions
To unsubscribe, send any mail to "[EMAIL PROTECTED]"
