gensdrphy: fix dm generation
make.py: init bios memory in build-bitstream action otherwise it is not possible to run clean or build-csr-csv or build-headers without build-bios
bios/crt0.S: remove unused macaddr, add syscall handler stub
spiflash: redundant slice
programmer: make xc3sprog verbose
bios: shorten abort wait and move flashboot last
memtest: papilio pro sdram changes