We have a single board computer (SBC) that includes a PLX 9656. These systems initially ran UNIX, Solaris 10 X86, now they must migrate to Red Hat Linux 6.2. Under UNIX all I/O was functional. We’ve found that with Linux installed, all I/O is good EXCEPT two RS232 serial ports whose UART resides on local bus under a PLX PCI 9656. The OEM of the SBC no longer is capable to support, so it’s up to us to support this design, which incorporates the PLX 9656.

RH Linux 6.2 detects the PLX 9656 but doesn’t attach a driver for it, Linux does not detect the DUART (Exar XR16L2551) located on local bus under the 9656. I really need to be able to talk to the serial ports under the PCI9656 via Red Hat Linux. I have to assume a Linux driver for same/similar implementation exists?

Please help.
Thanks in advance.
Amy

There seems to be a driver for this PLX 9656, it's in sound: Digigram PCXHR. If you do not have in your kernel, you may need to compile it separately. When this is loaded, the UART should be detected.