On Mon, 13 May 2019, Igor Plyatov wrote: > 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. You probably should ask somebody at the LINUX4SAM project. Alan Stern
