On 3/12/07, Alfred von Campe <alfred@xxxxxxx> wrote:
On Mar 9, 2007, at 15:53, Matt Hyclak wrote: > Have you looked at http://wiki.centos.org/HowTos/Custom_Kernel? OK, I've rebuilt the kernel according to the instructions on this page (I ran into some issues; see earlier post in another thread). I only changed two settings in the config file: CONFIG_SERIAL_8250_MANY_PORTS=y [originally disabled] CONFIG_SERIAL_8250_NR_UARTS=20 [originally 4]
As I understand it you can also set the kernel command line arg 8250.nr_uarts equal to some value like 8, 16, 32, etc, without having to rebuild your kernel (i.e. go into grub.conf and add to your kernel line " 8250.nr_uarts=32").
The good news is that the system now sees all eight serial ports (nine counting the one on the MB itself). But the naming convention for the serial ports leaves something to be desired: # dmesg | fgrep tty ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A ttyS14 at I/O 0x5020 (irq = 177) is a 16C950/954 ttyS15 at I/O 0x5028 (irq = 177) is a 16C950/954 ttyS44 at I/O 0x5030 (irq = 177) is a 16C950/954 ttyS45 at I/O 0x5038 (irq = 177) is a 16C950/954 ttyS46 at I/O 0x5060 (irq = 193) is a 16450 ttyS47 at I/O 0x5068 (irq = 193) is a 16450 ttyS48 at I/O 0x5070 (irq = 193) is a 16450 ttyS49 at I/O 0x5078 (irq = 193) is a 16450 ttyS50 at I/O 0x50a0 (irq = 217) is a 16C950/954 ttyS51 at I/O 0x50a8 (irq = 217) is a 16C950/954 ttyS52 at I/O 0x50b0 (irq = 217) is a 16C950/954 ttyS53 at I/O 0x50b8 (irq = 217) is a 16C950/954 ttyS54 at I/O 0x50e0 (irq = 225) is a 16450 ttyS55 at I/O 0x50e8 (irq = 225) is a 16450 ttyS56 at I/O 0x50f0 (irq = 225) is a 16450 ttyS57 at I/O 0x50f8 (irq = 225) is a 16450
IIRC, what you have to do is create a udev rule so that you can cause your serial port naming to persist the way you want. I've never created one myself, but we have done that in my group where I work, so the problem is familiar to me. Cheers...james _______________________________________________ CentOS mailing list CentOS@xxxxxxxxxx http://lists.centos.org/mailman/listinfo/centos
