All the USB samples and tests fail to enumerate.
git HEAD 77006e896

Output from the desc_sections test is below:

Nov 27 09:11:57 nm-ws kernel: [520538.130145] usb 7-2: USB disconnect, device number 65
Nov 27 09:12:00 nm-ws kernel: [520542.088211] usb 7-2: new full-speed USB device number 66 using ohci-pci
Nov 27 09:12:06 nm-ws kernel: [520547.360327] usb 7-2: device descriptor read/all, error -110
Nov 27 09:12:06 nm-ws kernel: [520547.516218] usb 7-2: new full-speed USB device number 67 using ohci-pci

And the relevant nrf console output:

D: ep 0, status 0
D: ** 0 **
D: bRequest 0x6, wIndex 0x0
D: REQ_GET_DESCRIPTOR


The Nordic usbd_cdc_acm_pca10056.hex works on the same board:

Nov 27 09:09:32 nm-ws kernel: [520393.141205] usb 7-2: USB disconnect, device number 64
Nov 27 09:09:32 nm-ws kernel: [520393.735742] usb 7-2: new full-speed USB device number 65 using ohci-pci
Nov 27 09:09:32 nm-ws kernel: [520393.938828] usb 7-2: New USB device found, idVendor=1915, idProduct=520f, bcdDevice= 1.00
Nov 27 09:09:32 nm-ws kernel: [520393.938834] usb 7-2: New USB device strings: Mfr=1, Product=2, SerialNumber=3
Nov 27 09:09:32 nm-ws kernel: [520393.938838] usb 7-2: Product: nRF52 USB CDC Demo
Nov 27 09:09:32 nm-ws kernel: [520393.938841] usb 7-2: Manufacturer: Nordic Semiconductor
Nov 27 09:09:32 nm-ws kernel: [520393.938843] usb 7-2: SerialNumber: 796cadf8f13bbb37
Nov 27 09:09:32 nm-ws kernel: [520393.940987] cdc_acm 7-2:1.0: ttyACM1: USB ACM device

Steve