..., but I'm down to this last missing function:
void up_usbinitialize(void)
Defined here: $ grep -r up_usbinitialize arch/arm/src/sam34 arch/arm/src/sam34/sam_udp.c: * Name: up_usbinitialize arch/arm/src/sam34/sam_udp.c:void up_usbinitialize(void)arch/arm/src/sam34/sam_udp.c: * in when up_usbinitialize() was first called.
Sound like a configuration problem: 146 ifeq ($(CONFIG_SAM34_UDP),y) 147 CHIP_CSRCS += sam_udp.c 148 endif