Quoting "maximilian attems" <max@stro.at>:
On Tue, 31 Mar 2009, W. Martin Borgert wrote:(Or, let Linux support eight instead of four serial ports by default, so that I don't need to build a kernel at the first place.)it does up to 32, just boot with nr_uarts=16 or 8250.nr_uarts=16
Ah, vielen Dank! I will forward the information to my colleague, who actually works on RS232/485. He tried, IIRC, sysctl of exactly this value at runtime and it didn't work, so he gave up too early...