AM3352: USB does not initialize in U-boot

Michael Amoruso

Part Number: AM3352

I am trying to initialize the USB0 controller in order to detect my flash drive in u-boot. Right now I have USB0 connected to a USB Header which I then have connected to my usb flash drive. Here is what I see:

U-Boot# usb start
(Re)start USB...
USB0: lowlevel init failed
USB error: all controllers failed lowlevel init

The ID pin is tied to ground through a 0 Ohm resistor. I probe the USBDRVVBUS pin which I am using as an enable to a switch that will turn on the 5V power to the USB header and USBVBUS on the processor. This pin is always low most likely due to the controller initialization failure. I am using the u-boot built from SDK 7.0. Do you have any suggestions?

Thanks,

Mike

over 8 years ago

0 Biser Gatchev-XID over 8 years ago

TI__Guru**** 393215 points

Please post the relevant portion of the schematic.

0 Michael Amoruso over 8 years ago in reply to Biser Gatchev-XID

Intellectual 275 points

Biser,

I actually was able to get this part to work. The issue apparently is that uboot cant support 2 USB hosts. One has to be set to host and the other peripheral. Now with that in mind, we plan on using one USB for loading the linux operating system, which we are successfully able to do. The other usb is going to be used for a USB to Ethernet connection through a LAN9500A chip. Now, within our software is this going to be possible because of the 1 host, 1 peripheral deal in uboot, or is that strictly a uboot requirement. We have both IDs tied to ground therefore we are going to need both USB controllers to be hosts within the linux os.

Thanks,
Mike

0 Biser Gatchev-XID over 8 years ago in reply to Michael Amoruso

TI__Guru**** 393215 points

There should be no issue with this. What Linux resp. U-boot version are you using?

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AM3352: USB does not initialize in U-boot