dvisampler: support differential input
Mixxeo support
make: fix byteswap invocation
dvisampler: report FIFO overflow
use Migen s6ddrphy, generate sdram init_sequence in cif.py
s6ddrphy: style and other minor fixes
memtest: LFSR
cif.py: use format instead of % in get_sdram_phy_header
memtest/LFSR: test bench
memtest: add DMA cores
top: integrate memtest cores
make: add option to include memtest cores
software: share crt0
software: share SDRAM linker script
software: move time.c to libbase
software: add memtest
cif : fix 2x autorefresh in get_sdram_phy_header
memtest/MemtestWriter: fix 'busy status stuck' bug
software/memtest: basic test
software/videomixer: fix overflow in memory bandwidth computation