Linux/DRA745: TI-evm board uboot unable to find usb storage

Cesar.Xi

Expert 1455 points

Part Number: DRA745

Tool/software: Linux

Hi,

board: TI-evm DRA74x

uboot version: 2016.05

sdk: ti-processor-sdk-linux-automotive-dra7xx-evm-03_02_00_03

usb start :can't find usb storage.

but the USB2 can find the device after starting the system,why the uboot can't find it.

thanks,

Cesar

over 6 years ago

0 Yordan Kamenov over 6 years ago

TI__Mastermind 42515 points

Hi Cesar,

I have forwarded your question to USB expert.

Regards,
Yordan

0 Ravi B over 6 years ago in reply to Yordan Kamenov

TI__Expert 7885 points

Cesar

So, the port is working fine in kernel, the device got detected. But not working in u-boot right.
The procedure in u-boot is correct, let me check on u-boot and come back on this.

Regards
Ravi

0 Cesar.Xi over 6 years ago in reply to Ravi B

Expert 1455 points

Hi Ravi,

I found the cause of the problem, the usb working that to reduce the phy2 impedance(0.1Ω~2.5Ω)

What explains this，why the phy2 can work without this operation on the kernel.

regards,

Cesar

0 Ravi B over 6 years ago in reply to Cesar.Xi

TI__Expert 7885 points

Cesar

This register is used to fine tune the signal strength for better eye diagram.
What is the value you have configured to make it work ?

Regards
Ravi

0 Cesar.Xi over 6 years ago in reply to Ravi B

Expert 1455 points

Hi Ravi,

the value(MEM_RTERM_RMX) are [0x1 ~ 0xA] within this range make it work.

why it must fine tune the signal strength, and it doesn't need configure on the kernel make it work.

regards,
Cesar

Processors

Processors forum

Linux/DRA745: TI-evm board uboot unable to find usb storage