david-usb-stm32f446-stmf32469-modified.patch

diff --git a/lib/usb/usb_f107.c b/lib/usb/usb_f107.c
index fb8ddf5..af98ddc 100644
--- a/lib/usb/usb_f107.c
+++ b/lib/usb/usb_f107.c
@@ -55,8 +55,14 @@ static usbd_device *stm32f107_usbd_init(void)
        OTG_FS_GINTSTS = OTG_GINTSTS_MMIS;
 
        OTG_FS_GUSBCFG |= OTG_GUSBCFG_PHYSEL;
-       /* Enable VBUS sensing in device mode and power down the PHY. */
-       OTG_FS_GCCFG |= OTG_GCCFG_VBUSBSEN | OTG_GCCFG_PWRDWN;
+
+       /* Enable VBUS sensing in device mode and power down the PHY.
+        * note: bit VBDEN and NOVBUSSENS are same */
+       OTG_FS_GCCFG |= OTG_GCCFG_PWRDWN | OTG_GCCFG_NOVBUSSENS |
+                                       OTG_GCCFG_VBUSASEN | OTG_GCCFG_VBUSBSEN;
+
+       /* make sure that SDIS is low */
+       OTG_FS_DCTL &= ~OTG_DCTL_SDIS;
 
        /* Wait for AHB idle. */
        while (!(OTG_FS_GRSTCTL & OTG_GRSTCTL_AHBIDL));

No - Even if it does work it on my silicon - it violates the reserved bit contract we should abide by.

see libopencm3/libopencm3#681 (comment)