Re: imx6ul (phytec Segin board) USB/DFU

[Ladislav Michl <ladis@linux-mips.org>]

On Wed, Nov 28, 2018 at 03:53:45PM +0100, Erwin Rol wrote:
> Hallo All,
> 
> I am trying to get USB device (DFU) to work on my Phytec Segin board
> (imx6ul SOC). 
> 
> I can upload barebox with imx-usb-loader and it starts fine (so USB
> hardware is working)
> 
> Than when barebox runs I want to put that same USB port in DFU mode and
> update the nand flash (barebox, env, kernel, rootfs) via DFU.
> 
> But I can't get it to work, I assume USB device mode setup is missing
> from the board setup, but I can't really find info on how to add it.
> 
> Any hints are very welcome.

For custom AT91 based board I did:

$ cat arch/arm/boards/simear4/env/nv/usbgadget.dfu_function 
/dev/dataflash0.at91bootstrap(bootstrap)sr,/dev/dataflash0.barebox(bootloader)sr,/dev/nand0.bb(system)ru
EOF

$ cat arch/arm/boards/simear4/env/init/usbgadget 
#!/bin/sh

if [ ${fffa4000.gadget@fffa4000.vbus} != 1 ]
then
	echo "No USB Device cable plugged, normal boot"
	exit 0
fi

echo "USB Device cable plugged, waiting for DFU button"

global.autoboot_timeout=60

dfu_button=79
dfu=0

if gpio_get_value ${dfu_button}
then
	dfu=1
else
	timeout -s -a 1
	if gpio_get_value ${dfu_button}
	then
		dfu=1
	fi
fi

if [ ${dfu} -eq 1 ]
then
	led green 1
	led red 1
	echo "Activating DFU"
	usbgadget -a -D
else
	led green 1
	echo "Activating USB console"
	usbgadget -a
fi
EOF

Note that current DFU implemetation does not follow DFU 1.1 specification,
that's something courious reader should fix ;-)

	ladis

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