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
1 回答
如果您的系统使用驱动程序8250来处理串行端口,请检查内核配置文件中的
CONFIG_SERIAL_8250_NR_UARTS
参数 . 这定义了内核将处理的最大串行端口数 .从Kconfig为该驱动程序:
有可能,
CONFIG_SERIAL_8250_NR_UARTS
的值在您的系统上仍为4 . 如果是这样,您可以在内核配置中设置更大的值并重建内核以使所有端口可用 .请注意,
8250.nr_uarts
内核运行时参数只能设置0到CONFIG_SERIAL_8250_NR_UARTS
之间的端口数,因此仅在引导时设置它是不够的 .