usb webcam can't work on DM365

Peter,

The error -28 shows NOSPC which points that dm365 is finding a matching endpoint for camera. This could be due to,

1. Endpoint packet size not set to camera's requirement (could be 1K). For this you can see the driver/usb/musb/musb_core.c

and fifo config _2_. You might need to modify one RX endpoint packet size to 1K. (Please make sure that the total size is less than (4096-64))

2. All endpoint have been used by hubs and other devices. For this you can enable interrupt endpoint scheduling at drivers->USB support->Inventra MUSB

Regards,
Ajay

Ajay:

Thanks for your reply.

I have try the two ways you suggested, I fix some errors but I got other error messages.
When I enable interrupt endpoint scheduling, I didn't see the error "init isoc: usb_submit_urb(0) ret -28".
Then I edit the driver/usb/musb/musb_core.c as following:

/* mode 2 - fits in 4KB */
static struct fifo_cfg __initdata mode_2_cfg[] = {
{ .hw_ep_num = 1, .style = FIFO_TX,   .maxpacket = 256, },
{ .hw_ep_num = 1, .style = FIFO_RX,   .maxpacket = 256, },
{ .hw_ep_num = 2, .style = FIFO_TX,   .maxpacket = 512, },
{ .hw_ep_num = 2, .style = FIFO_RX,   .maxpacket = 512, },
{ .hw_ep_num = 3, .style = FIFO_TX,   .maxpacket = 1024, },
{ .hw_ep_num = 3, .style = FIFO_RX,   .maxpacket = 1024, },
{ .hw_ep_num = 4, .style = FIFO_RXTX, .maxpacket = 256, },
};

After this changed, I got other error messages:

/home/pencil722/獢/DM365/useful/gspcav1-20071224/gspca_core.c: [spca5xx_set_
light_freq:1932] Sensor currently not support light frequency banding filters.
/home/pencil722/獢/DM365/useful/gspcav1-20071224/gspca_core.c: [gspca_set_is
oc_ep:945] ISO EndPoint found 0x81 AlternateSet 7
/home/pencil722/獢/DM365/useful/gspcav1-20071224/gspca_core.c: init isoc: us
b_submit_urb(0) ret -90
/home/pencil722/獢/DM365/useful/gspcav1-20071224/gspca_core.c: [spca5xx_open
:1996]  DEALLOC error on init_Isoc

Cannot open '/dev/video0': 90, Message too long

(/dev/video exists after I load the driver module)
These error messages seems to be related with the fifo space.
I want to set them to 1024 as you suggested, but it seems not work.

By the way, the steps I did are :
1. insmod usbcore.ko
2. insmod musb_hdrc,ko mode_default=1
3. insmod gspca.ko

Can you find what is the problem or what steps I did wrong?

regards,
Peter

Your camera seems to work only with high bandwidth isochronous interfaces only which is not available on DM365 platform. Can you send output of "cat /proc/bus/usb/devices" to confirm this?

OR connect the camera to linux PC and send output of "lsusb -v".

If this is the cause of the error then you need to use a camera which work with non-high bandwidth iso endpoints.

Regards,

Ajay

Ajay,

Thanks for your reply.

I try to check my usb webcam which work with high bandwidth isochronous or non-high bandwidth iso endpoints,
but I can't distinguish from the messages.
Here is the messages come from the dm365 and PC.
dm365:

T:  Bus=01 Lev=02 Prnt=02 Port=01 Cnt=02 Dev#=  4 Spd=12  MxCh= 0
D:  Ver= 1.10 Cls=ff(vend.) Sub=00 Prot=00 MxPS= 8 #Cfgs=  1
P:  Vendor=046d ProdID=08af Rev= 1.00
C:* #Ifs= 1 Cfg#= 1 Atr=a0 MxPwr=100mA
I:  If#= 0 Alt= 0 #EPs= 2 Cls=ff(vend.) Sub=ff Prot=ff Driver=gspca
E:  Ad=81(I) Atr=01(Isoc) MxPS=   0 Ivl=1ms
E:  Ad=82(I) Atr=03(Int.) MxPS=   8 Ivl=10ms
I:  If#= 0 Alt= 1 #EPs= 2 Cls=ff(vend.) Sub=ff Prot=ff Driver=gspca
E:  Ad=81(I) Atr=01(Isoc) MxPS= 128 Ivl=1ms
E:  Ad=82(I) Atr=03(Int.) MxPS=   8 Ivl=10ms
I:  If#= 0 Alt= 2 #EPs= 2 Cls=ff(vend.) Sub=ff Prot=ff Driver=gspca
E:  Ad=81(I) Atr=01(Isoc) MxPS= 192 Ivl=1ms
E:  Ad=82(I) Atr=03(Int.) MxPS=   8 Ivl=10ms
I:  If#= 0 Alt= 3 #EPs= 2 Cls=ff(vend.) Sub=ff Prot=ff Driver=gspca
E:  Ad=81(I) Atr=01(Isoc) MxPS= 256 Ivl=1ms
E:  Ad=82(I) Atr=03(Int.) MxPS=   8 Ivl=10ms
I:  If#= 0 Alt= 4 #EPs= 2 Cls=ff(vend.) Sub=ff Prot=ff Driver=gspca
E:  Ad=81(I) Atr=01(Isoc) MxPS= 384 Ivl=1ms
E:  Ad=82(I) Atr=03(Int.) MxPS=   8 Ivl=10ms
I:  If#= 0 Alt= 5 #EPs= 2 Cls=ff(vend.) Sub=ff Prot=ff Driver=gspca
E:  Ad=81(I) Atr=01(Isoc) MxPS= 512 Ivl=1ms
E:  Ad=82(I) Atr=03(Int.) MxPS=   8 Ivl=10ms
I:  If#= 0 Alt= 6 #EPs= 2 Cls=ff(vend.) Sub=ff Prot=ff Driver=gspca
E:  Ad=81(I) Atr=01(Isoc) MxPS= 768 Ivl=1ms
E:  Ad=82(I) Atr=03(Int.) MxPS=   8 Ivl=10ms
I:  If#= 0 Alt= 7 #EPs= 2 Cls=ff(vend.) Sub=ff Prot=ff Driver=gspca
E:  Ad=81(I) Atr=01(Isoc) MxPS=1023 Ivl=1ms
E:  Ad=82(I) Atr=03(Int.) MxPS=   8 Ivl=10ms

PC:

Bus 003 Device 014: ID 046d:08af Logitech, Inc. QuickCam Easy/Cool
Device Descriptor:
  bLength                18
  bDescriptorType         1
  bcdUSB               1.10
  bDeviceClass          255 Vendor Specific Class
  bDeviceSubClass         0
  bDeviceProtocol         0
  bMaxPacketSize0         8
  idVendor           0x046d Logitech, Inc.
  idProduct          0x08af QuickCam Easy/Cool
  bcdDevice            1.00
  iManufacturer           0
  iProduct                0
  iSerial                 0
  bNumConfigurations      1
  Configuration Descriptor:
    bLength                 9
    bDescriptorType         2
    wTotalLength          193
    bNumInterfaces          1
    bConfigurationValue     1
    iConfiguration          0
    bmAttributes         0xa0
      (Bus Powered)
      Remote Wakeup
    MaxPower              100mA
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        0
      bAlternateSetting       0
      bNumEndpoints           2
      bInterfaceClass       255 Vendor Specific Class
      bInterfaceSubClass    255 Vendor Specific Subclass
      bInterfaceProtocol    255 Vendor Specific Protocol
      iInterface              0
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x81  EP 1 IN
        bmAttributes            1
          Transfer Type            Isochronous
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0000  1x 0 bytes
        bInterval               1
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x82  EP 2 IN
        bmAttributes            3
          Transfer Type            Interrupt
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0008  1x 8 bytes
        bInterval              10
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        0
      bAlternateSetting       1
      bNumEndpoints           2
      bInterfaceClass       255 Vendor Specific Class
      bInterfaceSubClass    255 Vendor Specific Subclass
      bInterfaceProtocol    255 Vendor Specific Protocol
      iInterface              0
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x81  EP 1 IN
        bmAttributes            1
          Transfer Type            Isochronous
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0080  1x 128 bytes
        bInterval               1
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x82  EP 2 IN
        bmAttributes            3
          Transfer Type            Interrupt
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0008  1x 8 bytes
        bInterval              10
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        0
      bAlternateSetting       2
      bNumEndpoints           2
      bInterfaceClass       255 Vendor Specific Class
      bInterfaceSubClass    255 Vendor Specific Subclass
      bInterfaceProtocol    255 Vendor Specific Protocol
      iInterface              0
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x81  EP 1 IN
        bmAttributes            1
          Transfer Type            Isochronous
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x00c0  1x 192 bytes
        bInterval               1
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x82  EP 2 IN
        bmAttributes            3
          Transfer Type            Interrupt
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0008  1x 8 bytes
        bInterval              10
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        0
      bAlternateSetting       3
      bNumEndpoints           2
      bInterfaceClass       255 Vendor Specific Class
      bInterfaceSubClass    255 Vendor Specific Subclass
      bInterfaceProtocol    255 Vendor Specific Protocol
      iInterface              0
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x81  EP 1 IN
        bmAttributes            1
          Transfer Type            Isochronous
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0100  1x 256 bytes
        bInterval               1
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x82  EP 2 IN
        bmAttributes            3
          Transfer Type            Interrupt
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0008  1x 8 bytes
        bInterval              10
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        0
      bAlternateSetting       4
      bNumEndpoints           2
      bInterfaceClass       255 Vendor Specific Class
      bInterfaceSubClass    255 Vendor Specific Subclass
      bInterfaceProtocol    255 Vendor Specific Protocol
      iInterface              0
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x81  EP 1 IN
        bmAttributes            1
          Transfer Type            Isochronous
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0180  1x 384 bytes
        bInterval               1
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x82  EP 2 IN
        bmAttributes            3
          Transfer Type            Interrupt
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0008  1x 8 bytes
        bInterval              10
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        0
      bAlternateSetting       5
      bNumEndpoints           2
      bInterfaceClass       255 Vendor Specific Class
      bInterfaceSubClass    255 Vendor Specific Subclass
      bInterfaceProtocol    255 Vendor Specific Protocol
      iInterface              0
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x81  EP 1 IN
        bmAttributes            1
          Transfer Type            Isochronous
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0200  1x 512 bytes
        bInterval               1
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x82  EP 2 IN
        bmAttributes            3
          Transfer Type            Interrupt
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0008  1x 8 bytes
        bInterval              10
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        0
      bAlternateSetting       6
      bNumEndpoints           2
      bInterfaceClass       255 Vendor Specific Class
      bInterfaceSubClass    255 Vendor Specific Subclass
      bInterfaceProtocol    255 Vendor Specific Protocol
      iInterface              0
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x81  EP 1 IN
        bmAttributes            1
          Transfer Type            Isochronous
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0300  1x 768 bytes
        bInterval               1
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x82  EP 2 IN
        bmAttributes            3
          Transfer Type            Interrupt
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0008  1x 8 bytes
        bInterval              10
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        0
      bAlternateSetting       7
      bNumEndpoints           2
      bInterfaceClass       255 Vendor Specific Class
      bInterfaceSubClass    255 Vendor Specific Subclass
      bInterfaceProtocol    255 Vendor Specific Protocol
      iInterface              0
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x81  EP 1 IN
        bmAttributes            1
          Transfer Type            Isochronous
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x03ff  1x 1023 bytes
        bInterval               1
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x82  EP 2 IN
        bmAttributes            3
          Transfer Type            Interrupt
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0008  1x 8 bytes
        bInterval              10
Device Status:     0x0000
  (Bus Powered)

Can you tell me how to get the information about bandwidth speed?

regards,

Peter

This camera works on non highbandwidth endpoints. You can see value of wMaxPacketSize and if its <= 1024 then it's non high bandwidth but if is more than 1024 then that would require high bandwidth endpoints.

Ajay  

now we need to see why you are getting below error,

Cannot open '/dev/video0': 90, Message too long

Can you check if video0 is the mode which gets created after attaching the camera ?

-Ajay

Ajay,

I check the /dev/video0 gets created after attaching the camera.
Following is my checking process:

Before attaching the camera and load the module:
I cat the "/dev/video0",and get the messages:
cat: video0: No such file or directory

After attaching the camera and load the module:
I cat the "/dev/video0" again,and I get the messages:
/home/pencil722/獢/DM365/useful/gspcav1-20071224/gspca_core.c: [spca5xx_set_
light_freq:1932] Sensor currently not support light frequency banding filters.
/home/pencil722/獢/DM365/useful/gspcav1-20071224/gspca_core.c: [gspca_set_is
oc_ep:945] ISO EndPoint found 0x81 AlternateSet 7
/home/pencil722/獢/DM365/useful/gspcav1-20071224/gspca_core.c: init isoc: us
b_submit_urb(0) ret -90
/home/pencil722/獢/DM365/useful/gspcav1-20071224/gspca_core.c: [spca5xx_open
:1996]  DEALLOC error on init_Isoc

cat: video0: Message too long

During the process I did, I think the /dev/video0 gets created afte attaching the camera.

Is there something with symbo llink (something like this)?

Can you find where the problem?

regards,

Peter

Peter,

Please provide more details of kernel version used ?

Regards,
Ajay

Ajay,

The kernel version I used is linux-2.6.18_pro500 which I got from the TI's website.

The messages I got from dm365 board are:

Linux version 2.6.18_pro500-davinci_evm-arm_v5t_le (pencil722@lab745-desktop) (g
cc ? 4.2.0 (MontaVista 4.2.0-16.0.32.0801914 2008-08-30))

regards,

Peter

Peter,

I am not sure if Webcam is supported in v2.6.18 version of kernel. There have been major changes after 2.6.18 in musb driver and it can be found in linus's tree.

Now there seems to be two option for you,

1. Move to latest kernel OR

2. Back port all the musb driver patches to v2.6.18.

You might have access to release notes/user guide for v2.6.18_pro500 which you can refer to confirm if WebCam is supported.

Regards,

Ajay

Ajay,

Thank you for your reply.
Because our kernel has been edited with the display component, I can't change my kernel version.
Then I want to patch my musb driver back, but I ca't find the old version of kernel source on TI's website.(TI's website provide DM365 only with the 2.6.18_pro500 version)
Could you tell me where I can get the kernel version which you know can support the usb webcam?
Or could you send me an email with that musb driver?

My email address is : pencil722@gmail.com

Regards,

Peter

The latest musb driver can be found at linus's tree below,

http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=tree;h=2bfc96a127bc1cc94d26bfaa40159966064f9c8c;hb=2bfc96a127bc1cc94d26bfaa40159966064f9c8c

Please be aware that there was a API change between usb core and HCD so using complete musb folder may not compile. You might have to change some code to make latest

driver compatible to v2.6.18.

Regards,
Ajay

Hi ,

I have problem with musb driver when tried to support Realtek 8192CU wifi module over usb. It give kernel oops message, and major portion of that is shown below. I'm also using 2.6.18 kernel.

Unable to handle kernel NULL pointer dereference at virtual address 00000038

pgd = c0004000

[00000038] *pgd=00000000

Internal error: Oops: 17 [#1]

Modules linked in: 8192cu sbull iscsi_tcp libiscsi scsi_transport_iscsi usbmon musb_hdrc usbcore ppp_deflate ppp_async ppp_synctty ppp_generic slhc tun loopl

CPU: 0

PC is at musb_start_urb+0x4c/0x928 [musb_hdrc]

LR is at musb_urb_enqueue+0x3cc/0x454 [musb_hdrc]

pc : [<bf0bf704>]    lr : [<bf0c0a4c>]    Not tainted

.........

Backtrace: 

[<bf0bf6b8>] (musb_start_urb+0x0/0x928 [musb_hdrc]) from [<bf0c0a4c>] (musb_urb_enqueue+0x3cc/0x454 [musb_hdrc])

[<bf0c0680>] (musb_urb_enqueue+0x0/0x454 [musb_hdrc]) from [<bf0a40a4>] (hcd_submit_urb+0x86c/0x964 [usbcore])

[<bf0a3838>] (hcd_submit_urb+0x0/0x964 [usbcore]) from [<bf0a4534>] (usb_submit_urb+0x300/0x350 [usbcore])

[<bf0a4234>] (usb_submit_urb+0x0/0x350 [usbcore]) from [<bf0a4d00>] (usb_start_wait_urb+0x44/0x174 [usbcore])

[<bf0a4cbc>] (usb_start_wait_urb+0x0/0x174 [usbcore]) from [<bf0a5030>] (usb_control_msg+0xe0/0x104 [usbcore])

[<bf0a4f50>] (usb_control_msg+0x0/0x104 [usbcore]) from [<bf108184>] (usbctrl_vendorreq+0xd0/0x158 [8192cu])

[<bf1080b4>] (usbctrl_vendorreq+0x0/0x158 [8192cu]) from [<bf108364>] (usb_write8+0x48/0x88 [8192cu])

Video and audio is streaming over wifi for around 5 mins @ 720P resoution, 30 FPS.

I tried the methods described above in the thread except backporting to the latest usb driver. Could you please suggest me if any workaround possible in 2.6.18 musb driver ?

Thank you

tvs

the problem comes form the High-bandwidth ISO mode webcam with DM365.

check it out: section 4.72 about USB. the source code about this part is
now:

musb_core.c，musb_core_init：
   if (reg & MUSB_CONFIGDATA_HBRXE) {
              strcat(aInfo, ", HB-ISO Rx");
              musb->hb_iso_rx = true;
       }
       if (reg & MUSB_CONFIGDATA_HBTXE) {
              strcat(aInfo, ", HB-ISO Tx");
              musb->hb_iso_tx = true;
       }

musb_host.c, musb_urb_enqueue
      /* Bits 11 & 12 of wMaxPacketSize encode high bandwidth multiplier.
       * Some musb cores don't support high bandwidth ISO transfers; and
       * we don't (yet!) support high bandwidth interrupt transfers.
       */
       qh->hb_mult = 1 + ((qh->maxpacket >> 11) & 0x03);
       if (qh->hb_mult > 1) {
              int ok = (qh->type == USB_ENDPOINT_XFER_ISOC);

              if (ok)
                     ok = (usb_pipein(urb->pipe) && musb->hb_iso_rx)
                            || (usb_pipeout(urb->pipe) && musb->hb_iso_tx);
              if (!ok) {
                     ret = -EMSGSIZE;
                     goto done;
              }
              qh->maxpacket &= 0x7ff;
       }

please check link1, link2 and link3   out

Regards, Mike

 i just want to know is there anyway to implement the driver to support the High-bandwidth ISO mode on DM365 ? can we try to init the usb webcam to negotiate about the bandwidth ??
someone told me that:

"However, it is very difficult to find a ISO mode webcam chip which have the packet size smaller than 1024 bytes in VGA/D1 or 720p resolution."

we get a webcam to be supported but it is :
usb.txt

it seems to be High-bandwidth ISO mode ?
     wMaxPacketSize     0x0b20  2x 800 bytes
     wMaxPacketSize     0x1320  3x 800 bytes
     wMaxPacketSize     0x1400  3x 1024 bytes

there seems to no sample way to get it work with the high-bandwidth iso mode except hack the source code, cus i found the hardware handle:

3.2.4.1.3 Error Handling
If a CRC or bit-stuff error occurs during the reception of a packet, the packet will still be stored in the FIFO
but the DATAERR_NAKTIMEOUT bit of HOST_RXCSR (bit 3) is set to indicate that the data may be
corrupt

if we donot take care of the NAKTIMEOUT errror, what will happen with more then 1kb data package? is it the only way to make it works ?

Thanks in advance

Regards, Mike

Mike,

DM365 doesn't support high bandwidth iso transfer.

Regards,

Ajay

hi, Ajay

yes,you are right.

 it was confirmed with the FAE.

regards,Mike

Hi  Ajay,

Is  high bandwidth iso transfer not possible because of hardware limitation or is it a s/w problem ? After going through SPRUFH9A  document section (3.3.2.1 ), i feel that it could be a s/w problem. Rx buffer size can be between 1 to 64k size

As per section 3.3.2.7 i,,e Transparent Mode and RNDIS Mode Receive DMA Operation

RNDIS mode DMA is used to receive DMA packets which are larger than USB MaxPktSize. This is
accomplished by breaking the larger packet into smaller packets, not larger than USB MaxPktSize. This
implies that multiple USB packets of MaxPktSize will be received and transferred together as a single
large DMA packet and the DMA interrupt is generated only at the end of the complete reception of DMA
packet.

From the above definition enabling RNDIS mode DMA, the usb host should be able to receive the packets with larger size in isochronous transfer. Is there any patch which fixes the issue ?

The same problem was seen on DM 8148 but got fixed after applying the patch. I feel the same should be the case with DM 368

regards

pradeep

Pradeep,

It depends on platform in use. TI platforms DM365, DM644x, DM646x don't support high bandwidth iso tramsfer in hardware but AM35x, DM37x, TI814x, TI816x and AM335x do support it.

You can refer to latest kernel tree for TI814x at http://arago-project.org/git/projects/?p=linux-omap3.git;a=shortlog;h=refs/heads/TI814XPSP_04.01.00.07 which gets updated as and when there is a fix available.

Ajay

Hi Ajay,

As stated by you "DM365 doesn't support high bandwidth iso transfer.", does it means usb wifi modules will also not work properly?

Actually right now we are struggling with RTL8187L and RTL8188RU based USB wifi modules. Driver is ported successfully but after sometimes when load increases the Wifi modules behaves weird with  disconnections and it can only be reconnected after reboot.

I am using DM365EVM with DVSDK 4.02