Re: how to detect SD card under linux

On 7/9/07, Alan Stern <[email protected]> wrote:
> 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.

Yes, the SD card wasn't detected even i plug SD card in reader first
and then boot up linux kernel. From dmesg, it seems to me SD fail to
reply host TEST_UNIT_READY command. Maybe it is the problem between
USB2227 and SD card.
You mentioned HAL (hardware abstract layer, right?), how can get more
detail about it?

usb-storage: *** thread awakened.
usb-storage: Command TEST_UNIT_READY (6 bytes)
usb-storage:  00 00 00 00 00 00
usb-storage: Bulk Command S 0x43425355 T 0x11 L 0 F 0 Trg 0 LUN 0 CL 6
usb-storage: usb_stor_bulk_transfer_buf: xfer 31 bytes
usb-storage: Status code 0; transferred 31/31
usb-storage: -- transfer complete
usb-storage: Bulk command transfer result=0
usb-storage: Attempting to get CSW...
usb-storage: usb_stor_bulk_transfer_buf: xfer 13 bytes
usb-storage: Status code 0; transferred 13/13
usb-storage: -- transfer complete
usb-storage: Bulk status result = 0
usb-storage: Bulk Status S 0x53425355 T 0x11 R 0 Stat 0x1
usb-storage: -- transport indicates command failure
usb-storage: Issuing auto-REQUEST_SENSE
usb-storage: Bulk Command S 0x43425355 T 0x80000011 L 18 F 128 Trg 0 LUN 0 CL 6
usb-storage: usb_stor_bulk_transfer_buf: xfer 31 bytes
usb-storage: Status code 0; transferred 31/31
usb-storage: -- transfer complete
usb-storage: Bulk command transfer result=0
usb-storage: usb_stor_bulk_transfer_buf: xfer 18 bytes
usb-storage: Status code 0; transferred 18/18
usb-storage: -- transfer complete
usb-storage: Bulk data transfer result 0x0
usb-storage: Attempting to get CSW...
usb-storage: usb_stor_bulk_transfer_buf: xfer 13 bytes
usb-storage: Status code 0; transferred 13/13
usb-storage: -- transfer complete
usb-storage: Bulk status result = 0
usb-storage: Bulk Status S 0x53425355 T 0x80000011 R 0 Stat 0x0
usb-storage: -- Result from auto-sense is 0
usb-storage: -- code: 0x70, key: 0x2, ASC: 0x3a, ASCQ: 0x0
usb-storage: Not Ready: Medium not present
usb-storage: scsi cmd done, result=0x2
usb-storage: *** thread sleeping.

Paul

-------------------------------------------------------------------------
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/
_______________________________________________
[email protected]
To unsubscribe, use the last form field at:
https://lists.sourceforge.net/lists/listinfo/linux-usb-devel