while playing with dfu, I tapped in an unaligned access when doing on the host side a "lsusb -d [vendornr]: -v" I get on the board:
GADGET DRIVER: usb_dnl_dfu data abort
MAYBE you should read doc/README.arm-unaligned-accesses
pc : [<8ff71db8>] lr : [<8ff75aec>] sp : 8ef40d18 ip : 00000005 fp : 00000000 r10: 00000000 r9 : 47401410 r8 : 8ef40f38 r7 : 8ef4aae8 r6 : 0000000a r5 : 8ef4ab28 r4 : 8ef4ab80 r3 : 0000000a r2 : 00000006 r1 : 00000006 r0 : 8ef4aae8 Flags: Nzcv IRQs off FIQs on Mode SVC_32 Resetting CPU ...
reason is that in the "struct usb_composite_dev" the "struct usb_device_descriptor desc;" is on an odd address, and this struct gets accessed in drivers/usb/gadget/composite.c device_qual()
Fix it, by align this var "struct desc" fix to an aligned address.
Signed-off-by: Heiko Schocher hs@denx.de Cc: Marek Vasut marek.vasut@gmail.com Cc: Samuel Egli samuel.egli@siemens.com --- include/linux/usb/composite.h | 2 +- 1 Datei geändert, 1 Zeile hinzugefügt(+), 1 Zeile entfernt(-)
diff --git a/include/linux/usb/composite.h b/include/linux/usb/composite.h index 53cb095..4f76f88 100644 --- a/include/linux/usb/composite.h +++ b/include/linux/usb/composite.h @@ -331,7 +331,7 @@ struct usb_composite_dev { /* private: */ /* internals */ unsigned int suspended:1; - struct usb_device_descriptor desc; + struct usb_device_descriptor __aligned(CONFIG_SYS_CACHELINE_SIZE) desc; struct list_head configs; struct usb_composite_driver *driver; u8 next_string_id;