On Mon, 9 Jul 2007, jian tao wrote: > Hi pals, > > I am a new guy of linux usb driver. I met a problem with detecting SD > card under linux2.6.11. My developing board: MPC8349 EHCI host --> > ISP1505 (usb PHY) --->USB2227 (SMSC Flash card Reader chip). When > linux booting, i would success to detect usb2227 see below log. > Then i plug in SD card, nothing could happen, it fail to find scsi > device. I know there would be three kernel threads to polling current > usb status. One is "hub_thread" to polling port status; one is > "usb_stor_control_thread" to dealing with scsi cmd; another is > "usb_stor_scan_thread" to scan scsi devie. > > Question1: > when i plug SD card in USB2227 card reader, which thread would > responsible such event? i guess it must be the "usb_stor_scan_thread".
No. None of the threads you listed is responsible. In practice the detection is done by HAL, a userspace daemon. > Question2: > The function sd_probe would be called when a new scsi device attached. > What is the relationship between daemon process and this function? Which daemon process are you talking about? In general there is no connection between any daemons and sd_probe. > Question3: > What may the main cause of such issue? (suppose no hardware issue) Your question isn't clear. Are you asking why the kernel does not detect the SCSI device? But it _does_ detect the SCSI device, as you can see from your own log: > LOG: > Initializing USB Mass Storage driver... > usb 1-1: new high speed USB device using fsl-usb2-mph and address 2 > usb 1-1: Product: Flash Card Reader > usb 1-1: Manufacturer: Generic > usb 1-1: SerialNumber: 000022272228 > Begain run the storage_probe function > USB Mass Storage device detected > scsi1 : SCSI emulation for USB Mass Storage devices > usbcore: registered new driver usb-storage > USB Mass Storage support registered. > ..... > Vendor: Generic Model: Flash HS-CF Rev: 3.95 > Type: Direct-Access ANSI SCSI revision: 00 > Attached scsi removable disk sdb at scsi1, channel 0, id 0, lun 0 The last line shows that the kernel has detected a SCSI disk. Are you asking why the SD card wasn't detected when you put in in the reader? Probably because you weren't running HAL. Alan Stern ------------------------------------------------------------------------- This SF.net email is sponsored by DB2 Express Download DB2 Express C - the FREE version of DB2 express and take control of your XML. No limits. Just data. Click to get it now. http://sourceforge.net/powerbar/db2/ _______________________________________________ linux-usb-devel@lists.sourceforge.net To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel
