On the host side, I get the following messages from dmesg:
[11281.565099] usb 3-1: new high-speed USB device number 39 using xhci_hcd [11283.178280] usb 3-1: Device not responding to set address. [11283.378663] usb 3-1: Device not responding to set address. [11283.579739] usb 3-1: device not accepting address 39, error -71 [11283.939123] usb 3-1: new high-speed USB device number 41 using xhci_hcd [11283.939313] usb 3-1: Device not responding to set address. [11284.140316] usb 3-1: Device not responding to set address. [11284.341381] usb 3-1: device not accepting address 41, error -71
I investigated a bit further and added a few debug prints to U-Boot. If I understand correctly, IRQs are not actually being used and the fastboot command is polling on usb_gadget_handle_interrupts.
The status so far is that it still doesn't work on the host. As far as I can see, it doesn't get as far as enumerating the endpoints (see the log below).
The SET_ADDRESS request is received just fine, it then sets musb->ep0_state = MUSB_EP0_STAGE_STATUSIN; but no IRQ arrives to trigger another call to musb_g_ep0_irq. Eventually, the host just sends back another SET_REQUEST. Looking at dmesg on the host (Device not responding to set address), I guess that the device should send something back and it apparently doesn't.
Do you have any clue?
Here is the relevant U-Boot log:
U-Boot SPL 2015.01-rc2-gfc9200f-dirty (Dec 15 2014 - 17:59:56) reading u-boot.img reading u-boot.img
U-Boot 2015.01-rc2-gfc9200f-dirty (Dec 15 2014 - 17:59:56)
OMAP36XX/37XX-GP ES1.2, CPU-OPP2, L3-200MHz, Max CPU Clock 1 Ghz Sniper + LPDDR/MMC I2C: ready DRAM: 512 MiB MMC: OMAP SD/MMC: 0, OMAP SD/MMC: 1 Using default environment
In: serial Out: serial Err: serial musb_register musb_init_controller omap2430_musb_init HS USB OTG: revision 0x40, sysconfig 0x1008, sysstatus 0x1, intrfsel 0x1, simenable 0x0 omap2430_musb_disable musb_gadget_setup USB Peripheral mode controller at 480ab000 using PIO, IRQ 0 Hit any key to stop autoboot: 0 usb_gadget_register_driver musb_gadget_start musb_start omap2430_musb_enable fastboot_add adding 'f_fastboot'/9fe55240 to config 'usb_dnload'/9fe55180 fastboot_bind IN fastboot_bind OUT generic_interrupt: 45 1 0 ** IRQ peripheral usb002d tx0001 rx0000 <== Power=f0, DevCtl=98, int_usb=0x2d csr 0001, count 8, myaddr 0, ep0stage idle musb-hdrc: peripheral reset irq lost! musb_g_ep0_irq: power: 0xf0 speed: 0x3 new ep0 state is 6 service_zero_data_request() service_zero_data_request: SET_ADDRESS new ep0 state is 4 generic_interrupt: 1 0 0 ** IRQ peripheral usb0001 tx0000 rx0000 <== Power=e0, DevCtl=99, int_usb=0x1 generic_interrupt: 4 0 0 ** IRQ peripheral usb0004 tx0000 rx0000 <== Power=f0, DevCtl=99, int_usb=0x4 generic_interrupt: 8 0 0