From: Igor Plyatov <plyatov@gmail.com>
To: linux-usb@vger.kernel.org
Cc: Alan Stern <stern@rowland.harvard.edu>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Initialisation of SOC USB pads
Date: Mon, 13 May 2019 18:39:34 +0300 [thread overview]
Message-ID: <607c6b4c-d53a-8115-aa60-2a8461607d40@gmail.com> (raw)
Dear developers,
can you please explain who must configure AT91SAM9G20 SOC pads to
operate as USB Host port? Is it 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
next reply other threads:[~2019-05-13 15:39 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-05-13 15:39 Igor Plyatov [this message]
2019-05-13 15:47 ` Alan Stern
2019-05-22 14:40 ` Igor Plyatov
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