Problems
1. After installing RHEL on the LEC-2310, why are there only 4 serial ports detected?
2. After installing Debian on the LEC-2310, why are there only 4 serial ports detected?
Solutions
For Red Hat Enterprise Linux (RHEL)
RHEL only supports 4 serial ports as the default system configuration. To have more than 4 serial ports on the system, you should configure the grub file according the following instructions:
1. /etc/grub.cfg a kernel parameter 8250.nr_uarts=6.
2. #vi /etc/grub.conf
3. kernel /vmlinuz-2.6.32-279.22.1.el6.i686 ro .... 8250.nr_uarts=6
For Debian
Debian only supports 4 serial ports as the default system configuration. To have more than 4 serial ports on the system, you should configure the grub file according the following instructions:
1. /boot/grub/grub.cfg a kernel parameter 8250.nr_uarts=6.
2. Edit /etc/default/grub; GRUB_CMDLINE_LINUX="8250.nr_uarts=6"
3. Run update-grub.
4. Check /boot/grub/grub.cfg
5. Reboot.