Re: USB Storage: data transfer failing with Status code -71

Thanks a lot for your reply. Kindly see my responces inline.

On Mon, 19 Feb 2007, Mukesh Kohli wrote:

> Hello Guys,
> 
> I am trying to create a duplicate copy of a file onto a USB 2.0 device
> (memory stick) connected to my SOC (system on chip) board. Basic idea is
> to test data transfer across USB host controller and USB Device. It is
> failing randomly after copying different size if file. I am attaching
> the log I got on the console (with some of my extra messages). In the
> log attached the failure happened during data being received by the
> controller.
> 
> After seeing the transactions by hooking analyzer in between I am seeing
> the failure happening due to ACK not being sent by the controller in
> response to data (512 bytes) being sent by the device. And hence reset
> command is being issue.

ACK not being sent is a symptom, not a cause.

[Mukesh] What could be the cause. Could it be realated to some issue in the USB driver. Or its the issue in the hardware as described down.

> Any kind of help is appreciated. 
> 
> Linux OS version used: 2.6.11

That's pretty old.  You should try to use a more recent kernel.
[Mukesh] Thats the one needs to be used for our customers. Will it help if I pick USB code from one of  the latest kernel  verions? 

> usb-storage: *** thread awakened.
> usb-storage: Command READ_10 (10 bytes)
> usb-storage:  28 00 00 02 b3 5f 00 00 80 00
> usb-storage: Bulk Command S 0x43425355 T 0x4f L 65536 F 128 Trg 0 LUN 0 CL 10
> usb-storage: usb_stor_bulk_transfer_buf: xfer 31 bytes capri-ehci usb00: qtd alloc address 0xffc01180 , pool address----> 0xc09166e0 capri-ehci usb00: ehci_qtd_free: qtd address 0xffc01120, pool address----> 0xc09166e0
> 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_sglist: xfer 65536 bytes, 2 entries
> Fire: virtual address --> 0xc033a000 length --> 0x2000 DMA_FROM_DEVICE
> Fire: virtual address --> 0xc0988000 length --> 0xe000 DMA_FROM_DEVICE capri-ehci usb00: qtd alloc address 0xffc01120 , pool address----> 0xc09166e0 capri-ehci usb00: qtd alloc address 0xffc011e0 , pool address----> 0xc09166e0 capri-ehci usb00: qtd alloc address 0xffc01240 , pool address----> 0xc09166e0 capri-ehci usb00: qtd alloc address 0xffc012a0 , pool address----> 0xc09166e0 capri-ehci usb00: devpath 1 ep2in 3strikes capri-ehci usb00: ehci_qtd_free: qtd address 0xffc01060, pool address----> 0xc09166e0 capri-ehci usb00: ehci_qtd_free: qtd address 0xffc01120, pool address----> 0xc09166e0 capri-ehci usb00: ehci_qtd_free: qtd address 0xffc01240, pool address----> 0xc09166e0 capri-ehci usb00: ehci_qtd_free: qtd address 0xffc012a0, pool address----> 0xc09166e0
> usb-storage: Status code -71; transferred 0/65536
> usb-storage: -- unknown error

It sure would be easier to read this if you had put a '\n' at the end of 
your debugging messages.

You see that "devpath 1 ep2in 3strikes" hidden in amongst all the stuff
you added?  It means that the EHCI controller on your computer did not
receive the 512-byte DATA packet correctly, even though your bus analyzer
did.  That's why the controller didn't send an ACK, and it is the real
reason for the reset.

[Mukesh] I am seeing that some times the transfer do happen completly. So could there be any timinig related issue during memory allocation. I am trying to isolate the problem and want to rule out any issues in the hardware.

You might want to check the USB cables, connectors, and terminations.

[Mukesh] I'll do that.

Alan Stern






 
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