From mboxrd@z Thu Jan 1 00:00:00 1970 From: Adeel Nafis Date: Wed, 30 Jan 2013 13:59:52 +0500 Subject: [Buildroot] can not open ttyUSB0 In-Reply-To: References: Message-ID: <5108E108.2020801@linkwisetech.com> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: buildroot@busybox.net From: Thomas Petazzoni To: Adeel Nafis Cc:buildroot at busybox.net Subject: Re: [Buildroot] can not open ttyUSB0 Message-ID: <20130130093112.73034ecd@skate> Content-Type: text/plain; charset=US-ASCII > Before trying to access the device through /dev, make sure that your > kernel has actually detected this device, and that a driver has been > bound to it: > > *) Check your dmesg to see if there is something related to your 3G > modem and the creation of ttyUSB0 > > *) Check /sys/class/tty/ and check if there is a ttyUSB0 symlink. > Until there is no ttyUSB0 symlink, it means that the kernel hasn't > detected the device, or that a driver is missing for it. Thanks, the listing from dmesg does indicate the first detection and not the subsequent mode switching or connection to the ttyUSB0 of the modem usb 1-1: new full speed USB device using s3c2410-ohci and address 4 usb 1-1: configuration #1 chosen from 1 choice scsi4 : SCSI emulation for USB Mass Storage devices usb-storage: device found at 4 usb-storage: waiting for device to settle before scanning scsi5 : SCSI emulation for USB Mass Storage devices usb-storage: device found at 4 usb-storage: waiting for device to settle before scanning mmc0: starting CMD25 arg 00360d30 flags 00000035 mmc0: req done (CMD25): 0/0/0: 00000900 00000000 00000000 00000000 mmc0: starting CMD13 arg e6240000 flags 00000015 mmc0: req done (CMD13): 0/0/0: 00000900 00000000 00000000 00000000 mmc0: starting CMD25 arg 00360d48 flags 00000035 mmc0: req done (CMD25): 0/0/0: 00000900 00000000 00000000 00000000 mmc0: starting CMD13 arg e6240000 flags 00000015 mmc0: req done (CMD13): 0/0/0: 00000900 00000000 00000000 00000000 scsi 4:0:0:0: CD-ROM HUAWEI Mass Storage 2.31 PQ: 0 ANSI: 2 scsi 5:0:0:0: Direct-Access HUAWEI MMC Storage 2.31 PQ: 0 ANSI: 2 usb-storage: device scan complete sd 5:0:0:0: Attached scsi removable disk sda usb-storage: device scan complete there is no symlink for /sys/class/tty/ttyUSB0, so I guess this indicates that there is a missing driver, but which one? I have also tried doing the following modprobe usbserial vendor=0x12d1 product=0x1446 but it makes no difference. -- Adeel Ahmed Nafis Design Engineer LINKWISE TECHNOLOGY PTE LTD Blk 3 Ang Mo Kio Industrial Park 2A #06-08, AMK TECH 1 Singapore 568050