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Newer kernels are compiled with a configuration option that determines the max number of serial ports that can be active at runtime. The config option in 2.6.23 is called CONFIG_SERIAL_8250_RUNTIME_UARTS. I'm not sure what it's called in Centos 5. If it's set at 4, you'll have to rebuild your kernel with a larger value.
Last edited by jcliburn; 09-23-2007 at 08:48 AM.
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