tag	line	file	source code
UART_MCR_OUT2	707	kernel/chr_drv/serial.c	outb_p(UART_MCR_DTR | UART_MCR_RTS | UART_MCR_OUT2,
UART_MCR_OUT2	1112	kernel/chr_drv/serial.c	outb_p(UART_MCR_DTR | UART_MCR_RTS | UART_MCR_OUT2,