2 # USB Core configuration
4 config USB_ANNOUNCE_NEW_DEVICES
5 bool "USB announce new devices"
7 Say Y here if you want the USB core to always announce the
8 idVendor, idProduct, Manufacturer, Product, and SerialNumber
9 strings for every new USB device to the syslog. This option is
10 usually used by distro vendors to help with debugging and to
11 let users know what specific device was added to the machine
14 If you do not want this kind of information sent to the system
15 log, or have any doubts about this, say N here.
17 comment "Miscellaneous USB options"
19 config USB_DEFAULT_PERSIST
20 bool "Enable USB persist by default"
23 Say N here if you don't want USB power session persistence
24 enabled by default. If you say N it will make suspended USB
25 devices that lose power get reenumerated as if they had been
26 unplugged, causing any mounted filesystems to be lost. The
27 persist feature can still be enabled for individual devices
28 through the power/persist sysfs node. See
29 Documentation/usb/persist.txt for more info.
31 If you have any questions about this, say Y here, only say N
32 if you know exactly what you are doing.
34 config USB_DYNAMIC_MINORS
35 bool "Dynamic USB minor allocation"
37 If you say Y here, the USB subsystem will use dynamic minor
38 allocation for any device that uses the USB major number.
39 This means that you can have more than 16 of a single type
40 of device (like USB printers).
42 If you are unsure about this, say N here.
49 The most notable feature of USB OTG is support for a
50 "Dual-Role" device, which can act as either a device
51 or a host. The initial role is decided by the type of
52 plug inserted and can be changed later when two dual
53 role devices talk to each other.
55 Select this only if your board has Mini-AB/Micro-AB
58 config USB_OTG_WHITELIST
59 bool "Rely on OTG Targeted Peripherals List"
60 depends on USB_OTG || EXPERT
63 If you say Y here, the "otg_whitelist.h" file will be used as a
64 product whitelist, so USB peripherals not listed there will be
65 rejected during enumeration. This behavior is required by the
66 USB OTG specification for all devices not on your product's
67 "Targeted Peripherals List". "Embedded Hosts" are likewise
68 allowed to support only a limited number of peripherals.
70 Otherwise, peripherals not listed there will only generate a
71 warning and enumeration will continue. That's more like what
72 normal Linux-USB hosts do (other than the warning), and is
73 convenient for many stages of product development.
75 config USB_OTG_BLACKLIST_HUB
76 bool "Disable external hubs"
77 depends on USB_OTG || EXPERT
79 If you say Y here, then Linux will refuse to enumerate
80 external hubs. OTG hosts are allowed to reduce hardware
81 and software costs by not supporting external hubs. So
82 are "Embedded Hosts" that don't offer OTG support.