generate linker memory map, move all generated files into the same folder
rename create_sdram_modules and add register_rom
allow BIOS data to be passed to design
software/bios: infer flash start from linker
software: do not attempt to build network/sdram drivers when cores are not present
gensoc: add Papilio Pro ID
do not attempt to build SDRAM PHY header when SDRAM is not present
support for bitstream loading on Papilio Pro
targets: add simple SoC