Red Hat Bugzilla – Bug 184212
make CONFIG_SERIAL_8250_NR_UARTS bigger please
Last modified: 2015-01-04 17:25:50 EST
Description of problem: An 8 port serial board won't work without recompiling kernel to bump the number of "non-legacy" serial ports supported. This particular board is a vscom board from byterunner, but with the kernel insisting there are no more than 4 serial ports ever, I'm sure other boards would have the same problem. These boards are not that uncommon and I don't see how it could hurt anything to allow then to work without having to rebuild the kernel. Version-Release number of selected component (if applicable): How reproducible: Always Steps to Reproduce: 1. Install board 2. See only 4 /dev/ttyS* devices show up. 3. Actual results: Expected results: All 8 of 'em. Additional info: I put x86_64 in the platform field, but I imagine this is common to all platforms.
it's runtime configurable by booting with 8250.nr_uarts=8 (or however many you need). In the future, we'll find a way to make this automatic based upon hardware detection.
Thanks muchly. I'll see if I can get byterunner to put this info on their support site where folks like me can find it :-). Works great, I can talk to all my serial ports now after adding the boot parameter (much simpler than rebuilding the kernel :-).