I'm trying with no success to read registers implemented in PL in UBOOT (using md command). The registers are connected to M_AXI_GP0, everything is built fine because I can read/write them under debugger (XMD). When I read in uboot though it hangs. Looking in chipscope the M_AXI_GP0 bus is dead, its reset asserted. Do I need to enable the bus in uboot?