linux/arch/ia64/include/asm/serial.h

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/*
* Derived from the i386 version.
*/
/*
* This assumes you have a 1.8432 MHz clock for your UART.
*
* It'd be nice if someone built a serial card with a 24.576 MHz
* clock, since the 16550A is capable of handling a top speed of 1.5
* megabits/second; but this requires the faster clock.
*/
#define BASE_BAUD ( 1843200 / 16 )
/*
* All legacy serial ports should be enumerated via ACPI namespace, so
* we need not list them here.
*/