On Wed, 2017-08-30 at 14:23 +0800, huibin.hong@xxxxxxxxxxxxxx wrote: > Hello everyone > Many RK socs have 5 uart, and our customer may use more than 4 > uarts, but they don't know why > there is not ttyS4, because we need to modify the follow config. Why > limit the number 4? Where did you get this configuration? Moreover, 8250 module supports overriding of NR_UARTS at runtime. > > config SERIAL_8250_NR_UARTS > int "Maximum number of 8250/16550 serial ports" > depends on SERIAL_8250 > default "4" > help > Set this to the number of serial ports you want the driver > to support. This includes any ports discovered via ACPI or > PCI enumeration and any ports that may be added at run-time > via hot-plug, or any ISA multi-port serial cards. > > config SERIAL_8250_RUNTIME_UARTS > int "Number of 8250/16550 serial ports to register at runtime" > depends on SERIAL_8250 > range 0 SERIAL_8250_NR_UARTS > default "4" > help > Set this to the maximum number of serial ports you want > the kernel to register at boot time. This can be overridden > with the module parameter "nr_uarts", or boot-time parameter > 8250.nr_uarts > -- Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx> Intel Finland Oy -- To unsubscribe from this list: send the line "unsubscribe linux-serial" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
