Hi,
I'm currently using the driver g_file_storage on a gumstix product (see
http://gumstix.org).
This driver works fine when the option stall=N is set.
However, I encountered a problem when I plug it in a JVC micro HiFi.
With debug mode enabled, g_file_storage prints the following message in
kernel log:
g_file_storage gadget: bulk-out, length 31:
0: 55 53 42 43 03 00 00 00 12 00 00 00 80 00 05 03
10: 00 00 00 12 00 00 00 10 00 00 00 00 00 00 00
g_file_storage gadget: non-meaningful CBW: lun = 0, flags = 0x80, cmdlen 5
(see full log at the end of this email)
In the command send by the HiFi equipment, the length of the CBWCB is
equal to 5,
which makes g_file_storage module reject the message in file_storage.c
at line 3009 :
/* Is the CBW meaningful? */
if (cbw->Lun >= MAX_LUNS || cbw->Flags & ~USB_BULK_IN_FLAG ||
cbw->Length < 6 || cbw->Length > MAX_COMMAND_SIZE) {
DBG(fsg, "non-meaningful CBW: lun = %u, flags = 0x%x, "
"cmdlen %u\n",
cbw->Lun, cbw->Flags, cbw->Length);
I wonder why there is a 6 in here.
Indeed, the BBB Mass-Storage standard specifies:
"""
bCBWCBLength:
The valid length of the CBWCB in bytes. This defines the valid length
of the command block. The
only legal values are 1 through 16 (01h through 10h). All other
values are reserved.
"""
and if I replaced this 6 by 1, everything works fine.
Thanks,
Samuel Hangouët
Silicom, France
P.S. If you need more details :
For this test, I generated a 4Mo FAT12 backing file following the
indications written at:
http://www.linux-usb.org/gadget/file_storage.html
Here is the full log :
# modprobe g_file_storage file=backing stall=N
pxa2xx_udc: version 4-May-2005
g_file_storage gadget: File-backed Storage Gadget, version: 28 November 2005
g_file_storage gadget: Number of LUNs=1
g_file_storage gadget-lun0: ro=0, file: /root/backing
# tail -f /var/log/messages
pxa2xx_udc: version 4-May-2005
g_file_storage gadget-lun0: open backing file: backing
g_file_storage gadget: File-backed Storage Gadget, version: 28 November
2005
g_file_storage gadget: Number of LUNs=1
g_file_storage gadget-lun0: ro=0, file: /root/backing
g_file_storage gadget: transport=Bulk-only (x50)
g_file_storage gadget: protocol=Transparent SCSI (x06)
g_file_storage gadget: VendorID=x0525, ProductID=xa4a5, Release=x0303
g_file_storage gadget: removable=0, stall=0, buflen=16384
g_file_storage gadget: I/O thread pid: 268
g_file_storage gadget: suspend
g_file_storage gadget: resume
g_file_storage gadget: disconnect or port reset
g_file_storage gadget-lun0: fdatasync -> 0
g_file_storage gadget: disconnect or port reset
g_file_storage gadget-lun0: fdatasync -> 0
g_file_storage gadget: disconnect or port reset
g_file_storage gadget-lun0: fdatasync -> 0
g_file_storage gadget: ep0-setup, length 8:
0: 80 06 00 01 00 00 08 00
g_file_storage gadget: get device descriptor
g_file_storage gadget: ep0-in, length 8:
0: 12 01 00 02 00 00 00 10
g_file_storage gadget: disconnect or port reset
g_file_storage gadget-lun0: fdatasync -> 0
g_file_storage gadget: full speed config #1
g_file_storage gadget: ep0-setup, length 8:
0: 80 06 00 01 00 00 12 00
g_file_storage gadget: get device descriptor
g_file_storage gadget: ep0-in, length 18:
0: 12 01 00 02 00 00 00 10 25 05 a5 a4 03 03 01 02
10: 03 01
g_file_storage gadget: ep0-setup, length 8:
0: 80 06 00 02 00 00 04 00
g_file_storage gadget: get configuration descriptor
g_file_storage gadget: ep0-in, length 4:
0: 09 02 20 00
g_file_storage gadget: ep0-setup, length 8:
0: 80 06 00 02 00 00 20 00
g_file_storage gadget: get configuration descriptor
g_file_storage gadget: ep0-in, length 32:
0: 09 02 20 00 01 01 04 c0 01 09 04 00 00 02 08 06
10: 50 05 07 05 81 02 40 00 00 07 05 02 02 40 00 00
g_file_storage gadget: ep0-setup, length 8:
0: 00 09 01 00 00 00 00 00
g_file_storage gadget: set configuration
g_file_storage gadget: set interface 0
g_file_storage gadget: full speed config #1
g_file_storage gadget: ep0-setup, length 8:
0: 80 06 03 03 09 04 1a 00
g_file_storage gadget: get string descriptor
g_file_storage gadget: ep0-in, length 26:
0: 1a 03 33 00 32 00 33 00 38 00 32 00 30 00 34 00
10: 45 00 36 00 46 00 37 00 36 00
g_file_storage gadget: ep0-setup, length 8:
0: a1 fe 00 00 00 00 01 00
g_file_storage gadget: get max LUN
g_file_storage gadget: ep0-in, length 1:
0: 00
g_file_storage gadget: bulk-out, length 31:
0: 55 53 42 43 00 00 00 00 24 00 00 00 80 00 06 12
10: 00 00 00 24 00 00 00 00 00 00 00 00 00 00 00
g_file_storage gadget: SCSI command: INQUIRY; Dc=6, Di=36; Hc=6, Hi=36
g_file_storage gadget: bulk-in, length 36:
0: 00 00 02 02 1f 00 00 00 4c 69 6e 75 78 20 20 20
10: 46 69 6c 65 2d 53 74 6f 72 20 47 61 64 67 65 74
20: 30 33 30 33
g_file_storage gadget: bulk-in, length 13:
0: 55 53 42 53 00 00 00 00 00 00 00 00 00
g_file_storage gadget: bulk-out, length 31:
0: 55 53 42 43 01 00 00 00 10 00 00 00 80 00 0c 23
10: 00 00 00 00 00 00 00 10 00 00 00 00 00 00 00
g_file_storage gadget: SCSI command: READ FORMAT CAPACITIES; Dc=10,
Di=16; Hc=12, Hi=16
g_file_storage gadget: bulk-in, length 16:
0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
g_file_storage gadget: sending phase-error status
g_file_storage gadget: bulk-in, length 13:
0: 55 53 42 53 01 00 00 00 10 00 00 00 02
g_file_storage gadget: bulk-out, length 31:
0: 55 53 42 43 02 00 00 00 00 00 00 00 80 00 06 00
10: 00 00 00 00 00 00 00 10 00 00 00 00 00 00 00
g_file_storage gadget: SCSI command: TEST UNIT READY; Dc=6, Dn=0;
Hc=6, Hn=0
g_file_storage gadget: sending command-failure status
g_file_storage gadget: sense data: SK x06, ASC x29, ASCQ x00; info x0
g_file_storage gadget: bulk-in, length 13:
0: 55 53 42 53 02 00 00 00 00 00 00 00 01
g_file_storage gadget: bulk-out, length 31:
0: 55 53 42 43 03 00 00 00 12 00 00 00 80 00 05 03
10: 00 00 00 12 00 00 00 10 00 00 00 00 00 00 00
g_file_storage gadget: non-meaningful CBW: lun = 0, flags = 0x80, cmdlen 5
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