2 # USB Host Controller Drivers
4 comment "USB Host Controller Drivers"
7 tristate "Cypress C67x00 HCD support"
9 The Cypress C67x00 (EZ-Host/EZ-OTG) chips are dual-role
10 host/peripheral/OTG USB controllers.
12 Enable this option to support this chip in host controller mode.
15 To compile this driver as a module, choose M here: the
16 module will be called c67x00.
19 tristate "xHCI HCD (USB 3.0) support"
21 The eXtensible Host Controller Interface (xHCI) is standard for USB 3.0
22 "SuperSpeed" host controller hardware.
24 To compile this driver as a module, choose M here: the
25 module will be called xhci-hcd.
29 config USB_XHCI_PLATFORM
33 tristate "xHCI support for Marvell Armada 375/38x"
34 select USB_XHCI_PLATFORM
35 depends on ARCH_MVEBU || COMPILE_TEST
37 Say 'Y' to enable the support for the xHCI host controller
38 found in Marvell Armada 375/38x ARM SOCs.
43 tristate "EHCI HCD (USB 2.0) support"
45 The Enhanced Host Controller Interface (EHCI) is standard for USB 2.0
46 "high speed" (480 Mbit/sec, 60 Mbyte/sec) host controller hardware.
47 If your USB host controller supports USB 2.0, you will likely want to
48 configure this Host Controller Driver.
50 EHCI controllers are packaged with "companion" host controllers (OHCI
51 or UHCI) to handle USB 1.1 devices connected to root hub ports. Ports
52 will connect to EHCI if the device is high speed, otherwise they
53 connect to a companion controller. If you configure EHCI, you should
54 probably configure the OHCI (for NEC and some other vendors) USB Host
55 Controller Driver or UHCI (for Via motherboards) Host Controller
58 You may want to read <file:Documentation/usb/ehci.txt>.
60 To compile this driver as a module, choose M here: the
61 module will be called ehci-hcd.
63 config USB_EHCI_ROOT_HUB_TT
64 bool "Root Hub Transaction Translators"
65 depends on USB_EHCI_HCD
67 Some EHCI chips have vendor-specific extensions to integrate
68 transaction translators, so that no OHCI or UHCI companion
69 controller is needed. It's safe to say "y" even if your
70 controller doesn't support this feature.
72 This supports the EHCI implementation that's originally
73 from ARC, and has since changed hands a few times.
75 config USB_EHCI_TT_NEWSCHED
76 bool "Improved Transaction Translator scheduling"
77 depends on USB_EHCI_HCD
80 This changes the periodic scheduling code to fill more of the low
81 and full speed bandwidth available from the Transaction Translator
82 (TT) in USB 2.0 hubs. Without this, only one transfer will be
83 issued in each microframe, significantly reducing the number of
84 periodic low/fullspeed transfers possible.
86 If you have multiple periodic low/fullspeed devices connected to a
87 highspeed USB hub which is connected to a highspeed USB Host
88 Controller, and some of those devices will not work correctly
89 (possibly due to "ENOSPC" or "-28" errors), say Y. Conversely, if
90 you have only one such device and it doesn't work, you could try
95 config USB_FSL_MPH_DR_OF
105 config USB_EHCI_HCD_PMC_MSP
106 tristate "EHCI support for on-chip PMC MSP71xx USB controller"
107 depends on MSP_HAS_USB
109 select USB_EHCI_BIG_ENDIAN_DESC
110 select USB_EHCI_BIG_ENDIAN_MMIO
112 Enables support for the onchip USB controller on the PMC_MSP7100 Family SoC's.
115 config XPS_USB_HCD_XILINX
116 bool "Use Xilinx usb host EHCI controller core"
117 depends on (PPC32 || MICROBLAZE)
118 select USB_EHCI_BIG_ENDIAN_DESC
119 select USB_EHCI_BIG_ENDIAN_MMIO
121 Xilinx xps USB host controller core is EHCI compilant and has
122 transaction translator built-in. It can be configured to either
123 support both high speed and full speed devices, or high speed
127 bool "Support for Freescale PPC on-chip EHCI USB controller"
129 select USB_EHCI_ROOT_HUB_TT
130 select USB_FSL_MPH_DR_OF if OF
132 Variation of ARC USB block used in some Freescale chips.
135 tristate "Support for Freescale i.MX on-chip EHCI USB controller"
137 select USB_EHCI_ROOT_HUB_TT
139 Variation of ARC USB block used in some Freescale chips.
141 config USB_EHCI_HCD_OMAP
142 tristate "EHCI support for OMAP3 and later chips"
147 Enables support for the on-chip EHCI controller on
148 OMAP3 and later chips.
150 config USB_EHCI_HCD_ORION
151 tristate "Support for Marvell EBU on-chip EHCI USB controller"
152 depends on USB_EHCI_HCD && PLAT_ORION
155 Enables support for the on-chip EHCI controller on Marvell's
156 embedded ARM SoCs, including Orion, Kirkwood, Dove, Armada XP,
157 Armada 370. This is different from the EHCI implementation
158 on Marvell's mobile PXA and MMP SoC, see "EHCI support for
159 Marvell PXA/MMP USB controller" for those.
161 config USB_EHCI_HCD_SPEAR
162 tristate "Support for ST SPEAr on-chip EHCI USB controller"
163 depends on USB_EHCI_HCD && PLAT_SPEAR
166 Enables support for the on-chip EHCI controller on
169 config USB_EHCI_HCD_AT91
170 tristate "Support for Atmel on-chip EHCI USB controller"
171 depends on USB_EHCI_HCD && ARCH_AT91
174 Enables support for the on-chip EHCI controller on
178 tristate "Support for Qualcomm QSD/MSM on-chip EHCI USB controller"
179 depends on ARCH_MSM || ARCH_QCOM
180 select USB_EHCI_ROOT_HUB_TT
182 Enables support for the USB Host controller present on the
183 Qualcomm chipsets. Root Hub has inbuilt TT.
184 This driver depends on OTG driver for PHY initialization,
185 clock management, powering up VBUS, and power management.
186 This driver is not supported on boards like trout which
189 config USB_EHCI_TEGRA
190 tristate "NVIDIA Tegra HCD support"
191 depends on ARCH_TEGRA
192 select USB_EHCI_ROOT_HUB_TT
195 This driver enables support for the internal USB Host Controllers
196 found in NVIDIA Tegra SoCs. The controllers are EHCI compliant.
198 config USB_EHCI_HCD_PPC_OF
199 bool "EHCI support for PPC USB controller on OF platform bus"
203 Enables support for the USB controller present on the PowerPC
204 OpenFirmware platform bus.
207 bool "EHCI support for SuperH USB controller"
210 Enables support for the on-chip EHCI controller on the SuperH.
211 If you use the PCI EHCI controller, this option is not necessary.
213 config USB_EHCI_EXYNOS
214 tristate "EHCI support for Samsung S5P/EXYNOS SoC Series"
215 depends on PLAT_S5P || ARCH_EXYNOS
217 Enable support for the Samsung Exynos SOC's on-chip EHCI controller.
220 bool "EHCI support for Marvell PXA/MMP USB controller"
221 depends on (ARCH_PXA || ARCH_MMP)
222 select USB_EHCI_ROOT_HUB_TT
224 Enables support for Marvell (including PXA and MMP series) on-chip
225 USB SPH and OTG controller. SPH is a single port host, and it can
226 only be EHCI host. OTG is controller that can switch to host mode.
227 Note that this driver will not work on Marvell's other EHCI
228 controller used by the EBU-type SoCs including Orion, Kirkwood,
229 Dova, Armada 370 and Armada XP. See "Support for Marvell EBU
230 on-chip EHCI USB controller" for those.
232 config USB_W90X900_EHCI
233 tristate "W90X900(W90P910) EHCI support"
234 depends on ARCH_W90X900
236 Enables support for the W90X900 USB controller
238 config USB_CNS3XXX_EHCI
239 bool "Cavium CNS3XXX EHCI Module (DEPRECATED)"
240 depends on ARCH_CNS3XXX
241 select USB_EHCI_HCD_PLATFORM
243 This option is deprecated now and the driver was removed, use
244 USB_EHCI_HCD_PLATFORM instead.
246 Enable support for the CNS3XXX SOC's on-chip EHCI controller.
247 It is needed for high-speed (480Mbit/sec) USB 2.0 device
250 config USB_EHCI_ATH79
251 bool "EHCI support for AR7XXX/AR9XXX SoCs (DEPRECATED)"
252 depends on (SOC_AR71XX || SOC_AR724X || SOC_AR913X || SOC_AR933X)
253 select USB_EHCI_ROOT_HUB_TT
254 select USB_EHCI_HCD_PLATFORM
257 This option is deprecated now and the driver was removed, use
258 USB_EHCI_HCD_PLATFORM instead.
260 Enables support for the built-in EHCI controller present
261 on the Atheros AR7XXX/AR9XXX SoCs.
263 config USB_EHCI_HCD_PLATFORM
264 tristate "Generic EHCI driver for a platform device"
267 Adds an EHCI host driver for a generic platform device, which
268 provides a memory space and an irq.
272 config USB_OCTEON_EHCI
273 bool "Octeon on-chip EHCI support"
274 depends on CAVIUM_OCTEON_SOC
276 select USB_EHCI_BIG_ENDIAN_MMIO
278 Enable support for the Octeon II SOC's on-chip EHCI
279 controller. It is needed for high-speed (480Mbit/sec)
280 USB 2.0 device support. All CN6XXX based chips with USB are
285 config USB_OXU210HP_HCD
286 tristate "OXU210HP HCD support"
288 The OXU210HP is an USB host/OTG/device controller. Enable this
289 option if your board has this chip. If unsure, say N.
291 This driver does not support isochronous transfers and doesn't
292 implement OTG nor USB device controllers.
294 To compile this driver as a module, choose M here: the
295 module will be called oxu210hp-hcd.
297 config USB_ISP116X_HCD
298 tristate "ISP116X HCD support"
300 The ISP1160 and ISP1161 chips are USB host controllers. Enable this
301 option if your board has this chip. If unsure, say N.
303 This driver does not support isochronous transfers.
305 To compile this driver as a module, choose M here: the
306 module will be called isp116x-hcd.
308 config USB_ISP1760_HCD
309 tristate "ISP 1760 HCD support"
311 The ISP1760 chip is a USB 2.0 host controller.
313 This driver does not support isochronous transfers or OTG.
314 This USB controller is usually attached to a non-DMA-Master
315 capable bus. NXP's eval kit brings this chip on PCI card
316 where the chip itself is behind a PLB to simulate such
319 To compile this driver as a module, choose M here: the
320 module will be called isp1760.
322 config USB_ISP1362_HCD
323 tristate "ISP1362 HCD support"
325 Supports the Philips ISP1362 chip as a host controller
327 This driver does not support isochronous transfers.
329 To compile this driver as a module, choose M here: the
330 module will be called isp1362-hcd.
332 config USB_FUSBH200_HCD
333 tristate "FUSBH200 HCD support"
336 Faraday FUSBH200 is designed to meet USB2.0 EHCI specification
337 with minor modification.
339 To compile this driver as a module, choose M here: the
340 module will be called fusbh200-hcd.
342 config USB_FOTG210_HCD
343 tristate "FOTG210 HCD support"
346 Faraday FOTG210 is an OTG controller which can be configured as
347 an USB2.0 host. It is designed to meet USB2.0 EHCI specification
348 with minor modification.
350 To compile this driver as a module, choose M here: the
351 module will be called fotg210-hcd.
353 config USB_MAX3421_HCD
354 tristate "MAX3421 HCD (USB-over-SPI) support"
355 depends on USB && SPI
357 The Maxim MAX3421E chip supports standard USB 2.0-compliant
358 full-speed devices either in host or peripheral mode. This
359 driver supports the host-mode of the MAX3421E only.
361 To compile this driver as a module, choose M here: the module will
362 be called max3421-hcd.
365 tristate "OHCI HCD (USB 1.1) support"
367 The Open Host Controller Interface (OHCI) is a standard for accessing
368 USB 1.1 host controller hardware. It does more in hardware than Intel's
369 UHCI specification. If your USB host controller follows the OHCI spec,
370 say Y. On most non-x86 systems, and on x86 hardware that's not using a
371 USB controller from Intel or VIA, this is appropriate. If your host
372 controller doesn't use PCI, this is probably appropriate. For a PCI
373 based system where you're not sure, the "lspci -v" entry will list the
374 right "prog-if" for your USB controller(s): EHCI, OHCI, or UHCI.
376 To compile this driver as a module, choose M here: the
377 module will be called ohci-hcd.
381 config USB_OHCI_HCD_OMAP1
382 tristate "OHCI support for OMAP1/2 chips"
383 depends on ARCH_OMAP1
384 depends on ISP1301_OMAP || !(MACH_OMAP_H2 || MACH_OMAP_H3)
387 Enables support for the OHCI controller on OMAP1/2 chips.
389 config USB_OHCI_HCD_SPEAR
390 tristate "Support for ST SPEAr on-chip OHCI USB controller"
391 depends on USB_OHCI_HCD && PLAT_SPEAR
394 Enables support for the on-chip OHCI controller on
397 config USB_OHCI_HCD_S3C2410
398 tristate "OHCI support for Samsung S3C24xx/S3C64xx SoC series"
399 depends on USB_OHCI_HCD && (ARCH_S3C24XX || ARCH_S3C64XX)
402 Enables support for the on-chip OHCI controller on
403 S3C24xx/S3C64xx chips.
405 config USB_OHCI_HCD_LPC32XX
406 tristate "Support for LPC on-chip OHCI USB controller"
407 depends on USB_OHCI_HCD && ARCH_LPC32XX
408 depends on USB_ISP1301
411 Enables support for the on-chip OHCI controller on
414 config USB_OHCI_HCD_PXA27X
415 tristate "Support for PXA27X/PXA3XX on-chip OHCI USB controller"
416 depends on USB_OHCI_HCD && (PXA27x || PXA3xx)
419 Enables support for the on-chip OHCI controller on
422 config USB_OHCI_HCD_AT91
423 tristate "Support for Atmel on-chip OHCI USB controller"
424 depends on USB_OHCI_HCD && ARCH_AT91
427 Enables support for the on-chip OHCI controller on
430 config USB_OHCI_HCD_OMAP3
431 tristate "OHCI support for OMAP3 and later chips"
432 depends on (ARCH_OMAP3 || ARCH_OMAP4)
435 Enables support for the on-chip OHCI controller on
436 OMAP3 and later chips.
438 config USB_OHCI_HCD_DAVINCI
439 bool "OHCI support for TI DaVinci DA8xx"
440 depends on ARCH_DAVINCI_DA8XX
441 depends on USB_OHCI_HCD=y
444 Enables support for the DaVinci DA8xx integrated OHCI
445 controller. This driver cannot currently be a loadable
446 module because it lacks a proper PHY abstraction.
448 config USB_OHCI_ATH79
449 bool "USB OHCI support for the Atheros AR71XX/AR7240 SoCs (DEPRECATED)"
450 depends on (SOC_AR71XX || SOC_AR724X)
451 select USB_OHCI_HCD_PLATFORM
454 This option is deprecated now and the driver was removed, use
455 USB_OHCI_HCD_PLATFORM instead.
457 Enables support for the built-in OHCI controller present on the
458 Atheros AR71XX/AR7240 SoCs.
460 config USB_OHCI_HCD_PPC_OF_BE
461 bool "OHCI support for OF platform bus (big endian)"
463 select USB_OHCI_BIG_ENDIAN_DESC
464 select USB_OHCI_BIG_ENDIAN_MMIO
466 Enables support for big-endian USB controllers present on the
467 OpenFirmware platform bus.
469 config USB_OHCI_HCD_PPC_OF_LE
470 bool "OHCI support for OF platform bus (little endian)"
472 select USB_OHCI_LITTLE_ENDIAN
474 Enables support for little-endian USB controllers present on the
475 OpenFirmware platform bus.
477 config USB_OHCI_HCD_PPC_OF
480 default USB_OHCI_HCD_PPC_OF_BE || USB_OHCI_HCD_PPC_OF_LE
482 config USB_OHCI_HCD_PCI
483 tristate "OHCI support for PCI-bus USB controllers"
486 select USB_OHCI_LITTLE_ENDIAN
488 Enables support for PCI-bus plug-in USB controller cards.
491 config USB_OHCI_HCD_SSB
492 bool "OHCI support for Broadcom SSB OHCI core (DEPRECATED)"
493 depends on (SSB = y || SSB = USB_OHCI_HCD)
495 select USB_OHCI_HCD_PLATFORM
498 This option is deprecated now and the driver was removed, use
499 USB_HCD_SSB and USB_OHCI_HCD_PLATFORM instead.
501 Support for the Sonics Silicon Backplane (SSB) attached
502 Broadcom USB OHCI core.
504 This device is present in some embedded devices with
505 Broadcom based SSB bus.
510 bool "OHCI support for SuperH USB controller (DEPRECATED)"
512 select USB_OHCI_HCD_PLATFORM
514 This option is deprecated now and the driver was removed, use
515 USB_OHCI_HCD_PLATFORM instead.
517 Enables support for the on-chip OHCI controller on the SuperH.
518 If you use the PCI OHCI controller, this option is not necessary.
520 config USB_OHCI_EXYNOS
521 tristate "OHCI support for Samsung S5P/EXYNOS SoC Series"
522 depends on PLAT_S5P || ARCH_EXYNOS
524 Enable support for the Samsung Exynos SOC's on-chip OHCI controller.
526 config USB_CNS3XXX_OHCI
527 bool "Cavium CNS3XXX OHCI Module (DEPRECATED)"
528 depends on ARCH_CNS3XXX
529 select USB_OHCI_HCD_PLATFORM
531 This option is deprecated now and the driver was removed, use
532 USB_OHCI_HCD_PLATFORM instead.
534 Enable support for the CNS3XXX SOC's on-chip OHCI controller.
535 It is needed for low-speed USB 1.0 device support.
537 config USB_OHCI_HCD_PLATFORM
538 tristate "Generic OHCI driver for a platform device"
541 Adds an OHCI host driver for a generic platform device, which
542 provides a memory space and an irq.
546 config USB_OCTEON_OHCI
547 bool "Octeon on-chip OHCI support"
548 depends on CAVIUM_OCTEON_SOC
549 default USB_OCTEON_EHCI
550 select USB_OHCI_BIG_ENDIAN_MMIO
551 select USB_OHCI_LITTLE_ENDIAN
553 Enable support for the Octeon II SOC's on-chip OHCI
554 controller. It is needed for low-speed USB 1.0 device
555 support. All CN6XXX based chips with USB are supported.
560 tristate "UHCI HCD (most Intel and VIA) support"
561 depends on PCI || USB_UHCI_SUPPORT_NON_PCI_HC
563 The Universal Host Controller Interface is a standard by Intel for
564 accessing the USB hardware in the PC (which is also called the USB
565 host controller). If your USB host controller conforms to this
566 standard, you may want to say Y, but see below. All recent boards
567 with Intel PCI chipsets (like intel 430TX, 440FX, 440LX, 440BX,
568 i810, i820) conform to this standard. Also all VIA PCI chipsets
569 (like VIA VP2, VP3, MVP3, Apollo Pro, Apollo Pro II or Apollo Pro
570 133) and LEON/GRLIB SoCs with the GRUSBHC controller.
573 To compile this driver as a module, choose M here: the
574 module will be called uhci-hcd.
576 config USB_UHCI_SUPPORT_NON_PCI_HC
578 default y if (SPARC_LEON || USB_UHCI_PLATFORM)
580 config USB_UHCI_PLATFORM
582 default y if ARCH_VT8500
584 config USB_UHCI_BIG_ENDIAN_MMIO
586 default y if SPARC_LEON
588 config USB_UHCI_BIG_ENDIAN_DESC
590 default y if SPARC_LEON
593 tristate "Freescale QE USB Host Controller support"
594 depends on OF_GPIO && QE_GPIO && QUICC_ENGINE
598 This driver enables support for Freescale QE USB Host Controller
599 (as found on MPC8360 and MPC8323 processors), the driver supports
600 Full and Low Speed USB.
603 bool "Freescale QE USB Host Controller debug support"
604 depends on USB_FHCI_HCD && DEBUG_FS
606 Say "y" to see some FHCI debug information and statistics
610 tristate "Elan U132 Adapter Host Controller"
611 depends on USB_FTDI_ELAN
613 The U132 adapter is a USB to CardBus adapter specifically designed
614 for PC cards that contain an OHCI host controller. Typical PC cards
615 are the Orange Mobile 3G Option GlobeTrotter Fusion card. The U132
616 adapter will *NOT* work with PC cards that do not contain an OHCI
619 For those PC cards that contain multiple OHCI controllers only the
622 The driver consists of two modules, the "ftdi-elan" module is a
623 USB client driver that interfaces to the FTDI chip within ELAN's
624 USB-to-PCMCIA adapter, and this "u132-hcd" module is a USB host
625 controller driver that talks to the OHCI controller within the
626 CardBus cards that are inserted in the U132 adapter.
628 This driver has been tested with a CardBus OHCI USB adapter, and
629 worked with a USB PEN Drive inserted into the first USB port of
630 the PCCARD. A rather pointless thing to do, but useful for testing.
632 It is safe to say M here.
634 See also <http://www.elandigitalsystems.com/support/ufaq/u132linux.php>
637 tristate "SL811HS HCD support"
639 The SL811HS is a single-port USB controller that supports either
640 host side or peripheral side roles. Enable this option if your
641 board has this chip, and you want to use it as a host controller.
644 To compile this driver as a module, choose M here: the
645 module will be called sl811-hcd.
647 config USB_SL811_HCD_ISO
648 bool "partial ISO support"
649 depends on USB_SL811_HCD
651 The driver doesn't support iso_frame_desc (yet), but for some simple
652 devices that just queue one ISO frame per URB, then ISO transfers
653 "should" work using the normal urb status fields.
658 tristate "CF/PCMCIA support for SL811HS HCD"
659 depends on USB_SL811_HCD && PCMCIA
661 Wraps a PCMCIA driver around the SL811HS HCD, supporting the RATOC
662 REX-CFU1U CF card (often used with PDAs). If unsure, say N.
664 To compile this driver as a module, choose M here: the
665 module will be called "sl811_cs".
667 config USB_R8A66597_HCD
668 tristate "R8A66597 HCD support"
670 The R8A66597 is a USB 2.0 host and peripheral controller.
672 Enable this option if your board has this chip, and you want
673 to use it as a host controller. If unsure, say N.
675 To compile this driver as a module, choose M here: the
676 module will be called r8a66597-hcd.
678 config USB_RENESAS_USBHS_HCD
679 tristate "Renesas USBHS HCD support"
680 depends on USB_RENESAS_USBHS
682 The Renesas USBHS is a USB 2.0 host and peripheral controller.
684 Enable this option if your board has this chip, and you want
685 to use it as a host controller. If unsure, say N.
687 To compile this driver as a module, choose M here: the
688 module will be called renesas-usbhs.
691 tristate "Wireless USB Host Controller Interface (WHCI) driver"
692 depends on PCI && USB && UWB
696 A driver for PCI-based Wireless USB Host Controllers that are
697 compliant with the WHCI specification.
699 To compile this driver a module, choose M here: the module
700 will be called "whci-hcd".
703 tristate "Host Wire Adapter (HWA) driver"
708 This driver enables you to connect Wireless USB devices to
709 your system using a Host Wire Adaptor USB dongle. This is an
710 UWB Radio Controller and WUSB Host Controller connected to
711 your machine via USB (specified in WUSB1.0).
713 To compile this driver a module, choose M here: the module
714 will be called "hwa-hc".
717 tristate "i.MX21 HCD support"
718 depends on ARM && ARCH_MXC
720 This driver enables support for the on-chip USB host in the
723 To compile this driver as a module, choose M here: the
724 module will be called "imx21-hcd".
728 config USB_OCTEON2_COMMON
730 default y if USB_OCTEON_EHCI || USB_OCTEON_OHCI
733 tristate "BCMA usb host driver"
735 select USB_OHCI_HCD_PLATFORM if USB_OHCI_HCD
736 select USB_EHCI_HCD_PLATFORM if USB_EHCI_HCD
738 Enable support for the EHCI and OCHI host controller on an bcma bus.
739 It converts the bcma driver into two platform device drivers
745 tristate "SSB usb host driver"
747 select USB_OHCI_HCD_PLATFORM if USB_OHCI_HCD
748 select USB_EHCI_HCD_PLATFORM if USB_EHCI_HCD
750 Enable support for the EHCI and OCHI host controller on an bcma bus.
751 It converts the bcma driver into two platform device drivers
756 config USB_HCD_TEST_MODE
757 bool "HCD test mode support"
759 Say 'Y' to enable additional software test modes that may be
760 supported by the host controller drivers.
762 One such test mode is the Embedded High-speed Host Electrical Test
763 (EHSET) for EHCI host controller hardware, specifically the "Single
764 Step Set Feature" test. Typically this will be enabled for On-the-Go
765 or embedded hosts that need to undergo USB-IF compliance testing with
766 the aid of special testing hardware. In the future, this may expand
767 to include other tests that require support from a HCD driver.
769 This option is of interest only to developers who need to validate
770 their USB hardware designs. It is not needed for normal use. If