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