On Tue, 2 Oct 2007, Darwin Chen wrote:
> Hello,
> I'm porting uClinux for W90N740, the kernel is booted successful, but the USB
> Host has some problems. After the kernel is booted, I plug in a USB Card
> reader, the kernel outputs the following messages, I don't understand the
> messages, :(
> The attachment is the HCD source code for W90N740.
> $ cat /proc/kmsg &
> <7>usb-storage: Command READ_CAPACITY (10 bytes)
> <7>usb-storage: 25 00 00 00 00 00 00 00 00 00
> <7>usb-storage: Bulk Command S 0x43425355 T 0x5 L 8 F 128 Trg 0 LUN 0 CL 10
> <7>usb-storage: usb_stor_bulk_transfer_buf: xfer 31 bytes
> <7>drivers/usb/host/ohci-dbg.c: SUB 00336738 dev=2 ep=1out-bulk flags=c
> len=0/31 stat=-115
> <7>drivers/usb/host/ohci-dbg.c: data(0/31): 55 53 42 43 05 00 00 00 08 00 00
> 00 80 00 0a 25... stat:-115
> <7>drivers/usb/host/ohci-dbg.c: RET 00336738 dev=2 ep=1out-bulk flags=c
> len=31/31 stat=0
> <7>usb-storage: Status code 0; transferred 31/31
> <7>usb-storage: -- transfer complete
> <7>usb-storage: Bulk command transfer result=0
> <7>usb-storage: usb_stor_bulk_transfer_sglist: xfer 8 bytes, 1 entries
> <7>drivers/usb/host/ohci-dbg.c: SUB 0032cdb8 dev=2 ep=2in-bulk flags=5
> len=0/8 stat=-115
> <7>drivers/usb/host/ohci-dbg.c: RET 0032cdb8 dev=2 ep=2in-bulk flags=5
> len=8/8 stat=0
> <7>drivers/usb/host/ohci-dbg.c: data(8/8): 00 01 f5 ff 00 00 02 00 stat:0
> <7>usb-storage: Status code 0; transferred 8/8
> <7>usb-storage: -- transfer complete
> <7>usb-storage: Bulk data transfer result 0x0
> <7>usb-storage: Attempting to get CSW...
> <7>usb-storage: usb_stor_bulk_transfer_buf: xfer 13 bytes
> <7>drivers/usb/host/ohci-dbg.c: SUB 00336738 dev=2 ep=2in-bulk flags=c
> len=0/13 stat=-115
>
> $ <7>usb-storage: command_abort called
> <7>usb-storage: usb_stor_stop_transport called
> <7>usb-storage: -- cancelling URB
> <7>drivers/usb/host/ohci-dbg.c: UNLINK 00336738 dev=2 ep=2in-bulk flags=c
> len=0/13 stat=-104
>
> There is nothing in /proc/bus/usb!
>
> What should I do?
First, make sure /proc/bus/usb is mounted:
mount -t usbfs none /proc/bus/usb
Second, try plugging the card reader into a regular Linux system to
make sure it is okay.
Third, try plugging a different USB device (like a flash memory) into
your machine, instead of the card reader.
The error message means that Linux didn't receive a status reply from
the card reader after sending it a READ CAPACITY command. Either the
card reader didn't send a status reply or else the host controller
driver didn't detect the reply.
Alan Stern
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