Correct vxWorks elf boot to load at correct address

argv[0] contains bootvx (command name) not the load address, if called with
argv < 2 use load_addr, else use address argument given to the command.

Signed-off-by: Stany MARCEL <smarcel@novasys-ingenierie.com>
Correct zynq fpga load when buf is not aligned

When ARCH_DMA_MINALIGN is greater than header size of the bit file, and buf is
not aligned, new_buf address became greater then buf_start address and the
load_word loop corrupts bit file data.

A work around is to decrease new_buf of ARCH_DMA_MINALIGN, it might corrupt data
before buf but permits to load correctly.

Signed-off-by: Novasys Ingenierie <xilinx@novasys-ingenierie.com>