Linux Kernel Architecture

Mauerer runapp02.tex V2 - 09/04/2008 6:09pm Page 1145

Appendix B: Working with the Source Code

if USB_SUPPORT

config USB_ARCH_HAS_HCD

boolean

default y if USB_ARCH_HAS_OHCI

...

default PCI

config USB_ARCH_HAS_OHCI

boolean

# ARM:

default y if SA1111

default y if ARCH_OMAP

# PPC:

default y if STB03xxx

default y if PPC_MPC52xx

# MIPS:

default y if SOC_AU1X00

# more:

default PCI

config USB

tristate "Support for USB"

depends on USB_ARCH_HAS_HCD

---help---

Universal Serial Bus (USB) is a specification for a serial bus

subsystem which offers higher speeds and more features than the

traditional PC serial port. The bus supplies power to peripherals

...

source "drivers/usb/core/Kconfig"

source "drivers/usb/host/Kconfig"

...

source "drivers/usb/net/Kconfig"

comment "USB port drivers"

depends on USB

config USB_USS720

tristate "USS720 parport driver"

depends on USB && PARPORT

---help---

This driver is for USB parallel port adapters that use the Lucent

Technologies USS-720 chip. These cables are plugged into your USB

port and provide USB compatibility to peripherals designed with

parallel port interfaces.

...

source "drivers/usb/gadget/Kconfig"

endif # USB_SUPPORT

Figure B-2 illustrates how the defined tree structure is displayed on screen to enable users to select the
options they want.