* Unitialisation of SOC USB pads
@ 2019-05-13 14:47 Igor Plyatov
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From: Igor Plyatov @ 2019-05-13 14:47 UTC (permalink / raw)
To: Thibaut VARENE; +Cc: Alan Stern, Greg Kroah-Hartman, linux-usb
Dear Thibaut and others,
can you please explain who must configure AT91SAM9G20 SOC pads to
operate as USB Host port - AT91Bootstrap, U-Boot bootloader, Linux
kernel or this is not required at all?
I ask, because during connection of USB disk, my board complains
usb 1-1: device descriptor read/64, error -62
usb 1-1: device descriptor read/64, error -62
usb 1-1: device descriptor read/64, error -62
usb 1-1: device descriptor read/64, error -62
usb 1-1: device not accepting address 4, error -62
usb 1-1: device not accepting address 5, error -62
usb usb1-port1: unable to enumerate USB device
Looks like there is no connectivity between USB Host module of SOC and
USB device. Or am I wrong?
My setup is:
* AT91SAM9G20 based custom board;
* Linux kernel 4.9.36, from LINUX4SAM project.
* USB disk connected to USB Host port 0 (HDPA, HDMA pins of SOC). 39 Ohm
series resistors and 15 Kohm pull-down resistors added at these lines.
Connectivity between SOC and USB device confirmed by Ohmmeter.
* USB_VBUS voltage measured at USB connector = 4.96 VDC.
Best wishes
--
Igor Plyatov
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