Glasgow Embedded / Glasgow - History

gateware.boneless: use explicit SRU datapath (-16 DFFESR, +16 DFFSR, +1 LUT).

Before:
Number of cells: 627
SB_CARRY 77
SB_DFF 1
SB_DFFE 1
SB_DFFESR 80
SB_DFFSR 19
SB_LUT4 448
SB_RAM40_4K 1

After:
Number of cells: 628
SB_CARRY 77
SB_DFF 1
SB_DFFE 1
SB_DFFESR 64
SB_DFFSR 35
SB_LUT4 449
SB_RAM40_4K 1

gateware.boneless: use explicit ALU datapath (-16 CARRY, -11 LUT).

Before:
Number of cells: 654
SB_CARRY 93
SB_DFF 1
SB_DFFE 1
SB_DFFESR 80
SB_DFFSR 19
SB_LUT4 459
SB_RAM40_4K 1

After:
Number of cells: 627
SB_CARRY 77
SB_DFF 1
SB_DFFE 1
SB_DFFESR 80
SB_DFFSR 19
SB_LUT4 448
SB_RAM40_4K 1

arch.boneless: rename O flag to V flag.

To avoid confusion with zero.

arch.boneless: unswap CMP operands, actually make flags work properly.

Huge thanks to @cr1901 for figuring out all the necessary bit
twiddling.

gateware.boneless: oops, accidentally swapped operands of SUB and CMP.

Travis: migen should be installed by setuptools already.

software: build libfx2 in `python setup.py build_ext` too.