Hi all, I recently acquired an old Advantech UNO-1150G industrial computer to use as a home internet router and I'm in the process of getting the additional serial ports going. There are four serial ports, two standard RS-232 ones with one being a motherboard header, and two additional RS-323/RS-422/RS-485 ports hanging off a Oxford 16PCI952 PCI serial I/O interface. I have placed both ports into RS-232 mode by setting jumpers on the motherboard. The manufacturer's driver[1] appears to be a very old fork of the original 8250 serial driver, circa kernel 2.4 days, which they've hacked up to support their various serial cards. They advertise support for kernel 2.4, 2.6 and 3.x… 3.0.x would be more accurate on the latter. After much effort with `git bisect`, I've managed to get it to the point that it loads on kernel 4.10.1 without causing an oops. It does not however, write anything to the serial port. (Receive is unknown.) My work is here for now: https://github.com/sjlongland/adv950 I see other devices based around the Oxford serial devices all using the 8250 serial driver. It seems logical to me to try clean this driver up so that it can be merged back with that driver and go into the kernel. Is there any way to try and debug the serial infrastructure without having to resort to peppering the code with `printk` calls? Any other debugging hints? -- Stuart Longland (aka Redhatter, VK4MSL) I haven't lost my mind... ...it's backed up on a tape somewhere. 1. http://support.advantech.com/support/DownloadSRDetail_New.aspx?SR_ID=1-GLBRCD&Doc_Source=Download
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