TCI6638K2K: USB transfer speed in Uboot

Yunas Rashid

Part Number: TCI6638K2K

Hello TI,

I am trying to transfer some data from memory to USB drive using fatwrite command

fatwrite usb 0 0x80000000 dump.bin 0x8000000

This is supposed to transfer 128MB memory content to USB. The transfer speeds are very less (1MBps) while the link speed is 480MBps for USB 2.0 and 5Gbps for USB 3.0. What is the reason we get only 1MBps while transferring contents from RAM to USB?

Regards, Yunas

over 9 years ago

0 Cvetolin Shulev-XID over 9 years ago

TI__Guru 65405 points

Hi Yunas,

I've forwarded this to the experts. Their feedback should be posted here.

BR
Tsvetolin Shulev

0 Yunas Rashid over 9 years ago in reply to Cvetolin Shulev-XID

Intellectual 550 points

Hi

Any update please?

0 Yordan Kovachev over 9 years ago in reply to Yunas Rashid

TI__Guru**** 161600 points

Hi,

Which SDK version are you using? Is this linux or RTOS (since you refer to u-boot, I'd guess this is linux sdk)?

Best Regards,
Yordan

0 Yunas Rashid over 9 years ago in reply to Yordan Kovachev

Intellectual 550 points

Hello,

Sorry I didnt mention the exact scenario. I am not using Linux or RTOS, just Uboot. I halt uboot before it loads the kernel image and go to uboot prompt and enter the fatwrite command to trigger a USB write.

Regards, Yunas

0 Yunas Rashid over 9 years ago in reply to Yunas Rashid

Intellectual 550 points

Further if I let uboot load Linux kernel and do a cp to USB device from Linux prompt, I get proper USB speeds ( ~300Mbps for USB 2.0 device). But in my scenario i cannot use Linux kernel so I need to achieve these speeds from Uboot. As i can see, XHCI drivers are used in uboot. Any suggestions on what is missing in uboot that doesnt allow it to go to full speeds?

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TCI6638K2K: USB transfer speed in Uboot