Re: [linuxham] Multiport Serial Card Problems
- Thanks for this John,
Unfortunately this doesn't seem to work either, at least not on my Mint 14 PC.
73's de Dave, G8FXM
On 23/01/13 01:49, John Phelps wrote:
Hi all,Have more hopefully useful info for the serial issue :-)This link explains the details: http://linux.about.com/od/srl_howto/a/hwtsrl17t03.htmQuick Summary:
Hopefully adding this kernel commandline parameter clears the issue.
- The max number of Linux-kernel serial ports is normally 4 (defined when kernel is compiled)
- This number can be over-ridden though by adding the kernel commandline parameter " 8250.nr_uarts=X " where X is an integer value.
- how to add this new commandline parameter varies from Linux distro to Linux distro... also on some distros this is just " nr_uarts=X " ...
- No need to recompile kernel to add support for more serial ports.
On Sun, Jan 20, 2013 at 10:31 AM, CIW308 VE6OH <ssc@...> wrote:
There was an issue - long time ago - with some Kernels not supporting
more that, I think, 4 com ports. You may have to rebuild the Kernel
with support for more com ports.
MitchJ. T. (Mitch) Mitchell
On 2013-01-20 11:27, David Toombs wrote:
> Hi All,
> I'm still getting some strange results with my WCH Group Multi Port
> Serial Card card.
> setserial returns the following:
> /dev/ttyS4, UART: 16550A, Port: 0xcc20, IRQ: 19
> /dev/ttyS5, UART: 16550A, Port: 0xcc28, IRQ: 19
> /dev/ttyS6, UART: 16550A, Port: 0xcc30, IRQ: 19
> /dev/ttyS7, UART: 16550A, Port: 0xcc38, IRQ: 19
> ttyS4 and ttyS5 do not work at all. these are the additional ports
> physically provided by the expansion bus.
> ttyS6 and ttyS7 do work as expected in CQRLog i.e. if I configure
> either, they both work.
> however in FLDIGI by setting rig control to either ttyS6 or ttyS7,
> FLDIGI works irrespective of which com port I actually connect the rig
> too i.e. if I physically connect to ttyS6 a FLDIGI rig control setting
> of ttyS6 or ttyS7 will work and visa versa.
> Therefore maybe there is a problem with FLDIGI in addressing PCI serial
> cards sharing a common IRQ maybe? I suggest this only as CQRLog works as
> expected. Id appreciate hearing from anyone else who has a similar set
> up who can confirm my findings.
> I'm seeing reference to set_multiport via much googling, but havnt
> worked out if I should be using this and how to use it? If anyone can
> suggest a reason as to why ttyS4 and ttyS5 do not work wither either
> CQRLog or FLDIGI or advise on how I set set_multiport, I'd also be very
> grateful. I cant find any reason why these ports should not be working?
> Note this card works flawlessly in Windows Vista so I don't suspect a
> hardware failure.
Amateur Radio VE6OH RAC Director - Alberta, NWT, Nunavut
CFARS CIW308 RAC LO
Mobile Cellular 780 446 8958
SKYPE USER ID "MITCH-VE6OH"