Hi,
I'm trying to port the USB device controller stuff for the AP7000 to u-boot. Last week I found some items being checked into u-boot-usb so I gave it a go to port things. Some code is used from the at91_udc driver and some parts I used from the atmel_usba_udc linux driver. I've come to a point where some parts seem functional but when I connect the USB host it results in an immediate crash. When I do not connect the host, u- boot works well. Somehow I can't really figure out what is happening when I connect my USB cable. I do see that the host asks for a device descriptor and I do see it gets acknowledged (but wrongly) by the device (by USB analyzer). The main issue is that I can't figure out what gets called first when the host asks for the device descriptor.
Since the full code is a bit long, I just included some debug messaging below which shows which parts are handled (probably correctly by my code).
If someone has some ideas to what I can do to debug this or has some pointers to what happens when the hosts asks for the descriptor that would be great. I have the feeling I'm nearly there making this to work but probably missed out a tiny item along the way and been staring at the code for the past two days.
Best regards, Marcel
U-Boot code: (null) -> 00011cf8 data: 000192e0 -> 0004f3b0 DMA: Using memory from 0x13f6c000 to 0x13f70000 Flash: 8 MB at address 0x00000000 DRAM Configuration: Bank #0: 10000000 64 MB In: serial Out: serial Err: serial Net: USBA : Probing USB controller USBA : int requests Initialized EP 0 Initialized EP 1 Initialized EP 2 Initialized EP 3 Initialized EP 4 Initialized EP 5 Initialized EP 6 USB disabled ETHUSB : INIT ! ETHUSB : addr valid ETHUSB : addr valid USBA : registering driver Binding ethernet Ethernet number 24 Setting IN/OUT bulk stuff AutoEP :autoconfig reset Doing autoconfig AutoEP : EP autoconfig AutoEP : EP matches AutoEP : EP autoconfig AutoEP : EP matches AutoEP : EP matches AutoEP : EP autoconfig AutoEP : EP matches AutoEP : EP matches AutoEP : EP matches AutoEP : EP matches USBA : Set self powered ETHUSB : get address 00:1F:E5:00:12:5D ETHUSB : get address 0a:fa:63:8b:e8:0a using atmel_usba_udc, OUT ep2 IN ep1 STATUS ep4 MAC 00:1f:e5:00:12:5d HOST MAC 0a:fa:63:8b:e8:0a USBA : EP alloc request USBA : alloc request USBA : EP alloc request USBA : alloc request USBA : Enabled UDC 1 USBA : Enabled UDC 2 USBA : Enabled controller macb0, usb0 Press SPACE to abort autoboot in 3 seconds
*** Unhandled exception 0 at PC=0x00000000 pc: 00000000 lr: 13fb6384 sp: 13f6bed4 r12: 00801a1a r11: 00000000 r10: 051b3c56 r9: 00000000 r8: ffe00c14 r7: 00000001 r6: 13fca4c8 r5: 13f6bfa8 r4: 13f6bf3c r3: 13f6bf3c r2: 00000000 r1: 00000000 r0: 13f6bf0c Flags: qvnzc Mode bits: hrje....g CPU Mode: Application
Stack: (0x13f6bed4 to 0x13f6bfa8) bec0: 13fb658e 00000001 13fca4c8 bee0: 13f6bfa8 13f6bf3c 13fb7aa8 00000001 13fca4c8 13f6bfa8 13f6bf3c 00000000 bf00: 1a03f127 13f74087 13fc61a8 00000001 00000001 00000000 00000000 00000001 bf20: 13fc26ac 00000001 00000000 00000000 00000000 00000000 13f84100 13fb0c28 bf40: 13fcb4c4 13fca4c8 13f6bfa8 13f84100 00000000 00006438 13fb072e 13f6bfd4 bf60: 13fca4c8 13f6bfa8 00000000 13f6bfd4 13fcb4b4 00000000 13fc92e0 13fb01cc bf80: 04000000 13fca4c8 24007fb4 13fc1ef8 cde3089c 13fb0000 00000000 13fc92e0 bfa0: 00000000 00000000 Unhandled exception