On Mar 9, 2007, at 12:21, John R Pierce wrote: > this also explains why I could never get more than a couple ports > working on a 8 port card I picked up to use as a unix server serial > console controller. Yup, and it also explains all the behavior I've seen. > and, yeah, if I can request CentOS Plus kernel consider supporting > more serial ports, chalk me in! Me too. I just checked, and it appears that the CentOS Plus kernel does not have the additional ports configured by default. So I bit the bullet and started to build my own kernel. I had the kernel- devel package installed for my current kernel. I did a "make xconfig" in /usr/src/kernels/2.6.9-42.0.10.EL-i686 (after doing a "yum install qt-devel") and changed two options under Device Drivers - > Character devices -> Serial drivers: 1. Changed "Maximum number of non-legacy 8259/16559 serial ports" from 4 to 12 2. Enabled "Support more than 4 legacy serial ports" under "Extend 8250/16550 serial driver options" I saved the config, but when I do a make, I get the following error: # make CHK include/linux/version.h SPLIT include/linux/autoconf.h -> include/config/* CHK include/asm-i386/asm_offsets.h HOSTCC scripts/genksyms/genksyms.o HOSTCC scripts/genksyms/lex.o HOSTCC scripts/genksyms/parse.o HOSTLD scripts/genksyms/genksyms CC scripts/mod/empty.o HOSTCC scripts/mod/mk_elfconfig MKELF scripts/mod/elfconfig.h HOSTCC scripts/mod/file2alias.o HOSTCC scripts/mod/modpost.o HOSTCC scripts/mod/sumversion.o HOSTLD scripts/mod/modpost HOSTCC scripts/kallsyms HOSTCC scripts/pnmtologo HOSTCC scripts/conmakehash make[1]: *** No rule to make target `init/main.o', needed by `init/ built-in.o'. Stop. I even tried to re-install the kernel-devel RPM to no avail. Granted, I've never had to rebuild a CentOS kernel before, so maybe I'm missing some steps. But I thought all you needed to do was "make xconfig" (or "make menuconfig") followed by a make. Alfred