Section 9.20. Hardware-Specific Options

9.20. Hardware-Specific Options

These options specify different parameters, depending on the hardware present in the system.

Disable the USB subsystem.

If this option is present, the USB subsystem will not be initialized.

Parallel port and its mode.

lp= [0 |port[,port...]|reset |auto ]

Specify the parallel port to use. The lp=port1,port2... format associates a sequence of parallel ports to devices, starting with lp0. An example is lp=none,parport0, which would suppress configuration of the lp0 device and cause the lp1 device to use the first parallel port.

lp=0

Disables the printer driver.

lp=reset

Causes the attached printers to be reset. This option can be combined with the port specifications.

lp=auto

Causes the kernel to examine the device ID from each port to determine whether a IEEE 1284-compatible printer is attached. If so, the kernel will manage that printer.

Specify the parallel port parameters.

parport=[ setting[, setting...]

Specify settings for parallel port drivers. Parallel ports are assigned in the order they are specified on the command line, starting with parport0.

auto forces the driver to use any IRQ/DMA settings detected (the default is to ignore detected IRQ/DMA settings because of possible conflicts). You can also specify the base address, IRQ, and DMA settings in the format 0xnnnn[,irq[,dma]]. irq and dma can be numbers, auto to use detected settings on that particular port, or nofifo to avoid using a FIFO even if it is detected.

Parallel port initialization mode.

parport_init_mode=[spp|ps2|epp|ecp|ecpepp]

Specifies the mode for operating the parallel port. This is necessary on the Pegasos computer where the firmware has no options for setting up the parallel port mode. This option works for parallel port chips of type 686a and 8231.

Maximum number of UARTs to be registered.

nr_uarts= n

Specifies the maximum number of different UARTs that can be registered in the kernel.