1# 2# USB Core configuration 3# 4config USB_DEBUG 5 bool "USB verbose debug messages" 6 help 7 Say Y here if you want the USB core & hub drivers to produce a bunch 8 of debug messages to the system log. Select this if you are having a 9 problem with USB support and want to see more of what is going on. 10 11config USB_ANNOUNCE_NEW_DEVICES 12 bool "USB announce new devices" 13 default N 14 help 15 Say Y here if you want the USB core to always announce the 16 idVendor, idProduct, Manufacturer, Product, and SerialNumber 17 strings for every new USB device to the syslog. This option is 18 usually used by distro vendors to help with debugging and to 19 let users know what specific device was added to the machine 20 in what location. 21 22 If you do not want this kind of information sent to the system 23 log, or have any doubts about this, say N here. 24 25comment "Miscellaneous USB options" 26 27config USB_DEFAULT_PERSIST 28 bool "Enable USB persist by default" 29 default y 30 help 31 Say N here if you don't want USB power session persistence 32 enabled by default. If you say N it will make suspended USB 33 devices that lose power get reenumerated as if they had been 34 unplugged, causing any mounted filesystems to be lost. The 35 persist feature can still be enabled for individual devices 36 through the power/persist sysfs node. See 37 Documentation/usb/persist.txt for more info. 38 39 If you have any questions about this, say Y here, only say N 40 if you know exactly what you are doing. 41 42config USB_DYNAMIC_MINORS 43 bool "Dynamic USB minor allocation" 44 help 45 If you say Y here, the USB subsystem will use dynamic minor 46 allocation for any device that uses the USB major number. 47 This means that you can have more than 16 of a single type 48 of device (like USB printers). 49 50 If you are unsure about this, say N here. 51 52config USB_OTG 53 bool "OTG support" 54 depends on PM_RUNTIME 55 default n 56 help 57 The most notable feature of USB OTG is support for a 58 "Dual-Role" device, which can act as either a device 59 or a host. The initial role is decided by the type of 60 plug inserted and can be changed later when two dual 61 role devices talk to each other. 62 63 Select this only if your board has Mini-AB/Micro-AB 64 connector. 65 66config USB_OTG_WHITELIST 67 bool "Rely on OTG Targeted Peripherals List" 68 depends on USB_OTG || EXPERT 69 default y if USB_OTG 70 help 71 If you say Y here, the "otg_whitelist.h" file will be used as a 72 product whitelist, so USB peripherals not listed there will be 73 rejected during enumeration. This behavior is required by the 74 USB OTG specification for all devices not on your product's 75 "Targeted Peripherals List". "Embedded Hosts" are likewise 76 allowed to support only a limited number of peripherals. 77 78 Otherwise, peripherals not listed there will only generate a 79 warning and enumeration will continue. That's more like what 80 normal Linux-USB hosts do (other than the warning), and is 81 convenient for many stages of product development. 82 83config USB_OTG_BLACKLIST_HUB 84 bool "Disable external hubs" 85 depends on USB_OTG || EXPERT 86 help 87 If you say Y here, then Linux will refuse to enumerate 88 external hubs. OTG hosts are allowed to reduce hardware 89 and software costs by not supporting external hubs. So 90 are "Embedded Hosts" that don't offer OTG support. 91 92