Linux/AM3352: Usb0 is not working properly

user5355349

Intellectual 560 points

Part Number: AM3352

Tool/software: Linux

U disk cannot be recognized after device tree is enabled with usb0，

I want to know if there is anything else to change.

254 &usb0 {
255 status = "okay";
256 dr_mode = "host";
257 };

over 6 years ago

0 Bin Liu over 6 years ago

TI__Guru**** 169071 points

Hi,

Please provide the following information.

Which version of the Processor SDK do you use?
Which dts file is modified?
Is this on your custom board or TI EVM? If latter, which evm is it?

0 user5355349 over 6 years ago in reply to Bin Liu

Intellectual 560 points

SDK ti-processor-sdk-linux-am335x-evm-04.03.00.05

am335x-bone-common.dtsi

I made the board myself, using am3352

0 Bin Liu over 6 years ago in reply to user5355349

TI__Guru**** 169071 points

Hi,

Please post the usb0 portion of the board schematics.

0 user5355349 over 6 years ago in reply to Bin Liu

Intellectual 560 points

The motherboard is connected to another board of the button, and the other board leads to the usb interface.

按键板.pdf AM3352主板.pdf

0 Bin Liu over 6 years ago in reply to user5355349

TI__Guru**** 169071 points

Hi,

The AM335x USB0_VBUS pin has to be connected to the receptacle VBUS line, and USB0_ID pin has to be *directly* grounded. Without both, the usb controller will not work in host mode. Please refer to the AM335x EVM usb1 port design.

By the way, this usb hw design using the 4 separate wires will give your huge headaches down the road.

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Linux/AM3352: Usb0 is not working properly