DM365 USB peripheral mode

SAKHO

Hi,

We use the DM365 with linux 2.6.18 (Monta Vista). The USB driver works in pheripheral mode:

                        musb_hdrc: version 6.0, cppi-dma, peripheral, debug=0
                        musb_hdrc musb_hdrc: No DMA interrupt line
                      musb_hdrc: USB Peripheral mode controller at c3868000 using DMA, IRQ 12
                        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: /dev/mmcblk0p1

When we connect USB cable between the bord and a host PC, we have:

g_file_storage gadget: high speed config #1

Everything works and we can get files from the SD card. But, transfer rate is not high.

To copy a file to the PC, the transfer rate is 4MB/s with a VFAT SD card (SandDisk 16G class 4). We tried other SD cards, but the speed is not changing.

Is it possible to have higher transfer speeds (~ 10MB/s)? How can we improve this transfer rate?

If you have ideas, we need help.

Thank you in advance.

SAKHO

over 13 years ago

0 Renjith Thomas over 13 years ago

Guru 31670 points

Sakho,

Its possible to get close to 10MB/sec throughput using SD card. You might have to optimize the SD/MMC driver.

0 SAKHO over 13 years ago in reply to Renjith Thomas

Intellectual 390 points

Thank you for your reply.

We'll try to make this optimization. Can you tell us what specific drivers should we optimize for SD/MMC? Is there already a patch for such optimization?

Thank you again.

Best regard,

Sakho

0 Renjith Thomas over 13 years ago in reply to SAKHO

Guru 31670 points

Sakho,

You'll have to optimize the SD/MMC driver. One thing you can check in the code is whether you are using, multi-block read/write, DMA enabled etc..

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DM365 USB peripheral mode