Updating submodules.

 * litedram changed from b06e946 to de55a8e
    * de55a8e - test/test_bandwidth: review, cleanup, fix typo. <Florent Kermarrec>
    * 907ef73 - test/test_wishbone: add comments/cleanup. <Florent Kermarrec>
    * 02fd39c - test/test_fifo: add comments. <Florent Kermarrec>
    * 14edb5b - test/test_dma: add comments. <Florent Kermarrec>
    * 97e214b - test/test_bist: add comments, fix a typo. <Florent Kermarrec>
    * c55136c - test/test_bist: enable test_bist_csr_cdc (now passing with refactored CDC). <Florent Kermarrec>
    * 92e34d4 - frontend/bist: simplify and fix CDC using AsyncFIFO. <Florent Kermarrec>
    * 378c441 - frontend/bist: rename run/ready to run_cascade_in/run_cascade_out. <Florent Kermarrec>
    * 829dee6 - frontend/bist: remove run/ready CSR. <Florent Kermarrec>
    * b399ae2 - test/benchmark: default value of run is 1, no need to drive it. <Florent Kermarrec>
    * 7c5e1e7 - frontend/bist: remove wrong comment and don't increment ticks when waiting. <Florent Kermarrec>
    * 4dbb5b1 - test/run_benchmarks: fix syntax. <Florent Kermarrec>
    * 966ebcb - test: cleanup/uniformize things between tests. <Florent Kermarrec>
    * 0efd619 - test/test_adaption: review, add some comments. <Florent Kermarrec>
    * 38b78fc - test/run_benchmarks: review, minor styles changes. <Florent Kermarrec>
    * 962dcd7 - phy/model: review/cleanup DFITimingsChecker. <Florent Kermarrec>
    * 64c2be5 - README: switch to markdown. <Florent Kermarrec>
    *   835825b - Merge pull request timvideos#179 from antmicro/jboc/docs <enjoy-digital>
    |\
    | * dbac83f - core: add missing docstrings <Jędrzej Boczar>
    | * 1f246cb - core/crossbar: remove dead code <Jędrzej Boczar>
    * |   969943e - Merge pull request timvideos#178 from antmicro/jboc/unit-tests-crossbar <enjoy-digital>
    |\ \
    | * | 8a0bcb3 - test: add core.crossbar tests <Jędrzej Boczar>
    | * | e74a2e6 - test: fix missing cases in bankmachine test <Jędrzej Boczar>
    * | | 06965b7 - phy/gensdrphy: simplify using SDRTristate, change SDROutput/SDRInput to single-bit. <Florent Kermarrec>
    * | | 9d20642 - litex.build: update from migen.genlib.io litex.build.io. <Florent Kermarrec>
    * | | b9f4d99 - phy/gensdrphy: use SDRInput, SDROutput to allow infered or instantiated IO regs. <Florent Kermarrec>
    |/ /
    * |   36d62d5 - Merge pull request timvideos#177 from antmicro/jboc/unit-tests-bankmachine <enjoy-digital>
    |\ \
    | * | 7b8b68a - test: add core.bankmachine tests <Jędrzej Boczar>
    | |/
    * |   492b9fa - Merge pull request timvideos#175 from antmicro/jboc/unit-tests-bandwidth <enjoy-digital>
    |\ \
    | * | f0496b2 - core/bandwidth: avoid missing a command <Jędrzej Boczar>
    | * | c03bed8 - test: add core.bandwidth.Bandwidth tests <Jędrzej Boczar>
    * | | cc7621d - Merge pull request timvideos#173 from antmicro/jboc/unit-tests <enjoy-digital>
    |\| |
    | * | a62e59b - test: skip _CommandChooser tests from Issue timvideos#174 <Jędrzej Boczar>
    | * | 00fcdf6 - test: split core.multiplexer tests into separate files <Jędrzej Boczar>
    | * | f619bed - test: clean up the code of core.multiplexer <Jędrzej Boczar>
    | * | 1dd4227 - test: add core.multiplexer.Multiplexer tests <Jędrzej Boczar>
    | * | ea93246 - test: add comments to core.multiplexer._Steerer tests <Jędrzej Boczar>
    | * | 26ce993 - test: add core.multiplexer._Steerer tests <Jędrzej Boczar>
    | * | f36b5a4 - test: add core.multiplexer._CommandChooser tests <Jędrzej Boczar>
    | * | a1b1abe - test: use TestCase.subTest for more verbose error messages <Jędrzej Boczar>
    |  /
    * / e7cd6a7 - .travis.yml: udpate to keep it similar with others .travis.yml files. <Florent Kermarrec>
    |/
    * 0c3a610 - setup.py: simplify, switch to Python3.6+ (using python_requires), remove version. <Florent Kermarrec>
    * a98f51e - dfii: use reset_less on datapath/configuration CSRStorages. <Florent Kermarrec>
    * 96b273c - common/BitSlip: use reset_less on intermediate signal. <Florent Kermarrec>

 * liteeth changed from fb47853 to 705003e
    * 705003e - README: switch to markdown. <Florent Kermarrec>
    * 92c3048 - examples: use CRG from litex.build. <Florent Kermarrec>
    * 3bd807c - litex.build: update from migen.genlib.io litex.build.io. <Florent Kermarrec>
    * 6ec7038 - .travis.yml: fix git clone error. <Florent Kermarrec>
    * 47a2e5b - setup.py: simplify, switch to Python3.6+ (using python_requires), remove version. <Florent Kermarrec>
    * ab55304 - mac/sram: use reset_less on datapath/configuration CSRStorages. <Florent Kermarrec>

 * liteiclink changed from 370855d to 6fdd020
    * 6fdd020 - README: switch to markdown. <Florent Kermarrec>
    * c4edb7e - litex.build: update from migen.genlib.io litex.build.io. <Florent Kermarrec>
    * 1dcea14 - .travis.yml: fix git clone error. <Florent Kermarrec>
    * e6ab98a - setup.py: simplify, switch to Python3.6+ (using python_requires), remove version. <Florent Kermarrec>

 * litepcie changed from 5b7e7cd to 586ef78
    * 586ef78 - README: switch to markdown. <Florent Kermarrec>
    * 3e24df2 - README: add Xilinx Ultrascale support. <Florent Kermarrec>
    * 81b3e13 - examples: add KCU105 example. (PCIe gen2 X4). <Florent Kermarrec>
    * 32d64e4 - phy: add initial Ultrascale PHY (gen2 X4). <Florent Kermarrec>
    * bb7a1e0 - phy/xilinx_us_x4: adaptations on packets to expose/receive standardized TLPs. <Florent Kermarrec>
    * 1f28c9f - phy: add xilinx_us_x4. <Florent Kermarrec>
    * a65aab9 - examples/kc705: cleanup, enable bridge and generate csr.csv. <Florent Kermarrec>
    * 0748af1 - litepcie/common: update import. <Florent Kermarrec>
    * 6bcafc4 - .travis.yml: fix git clone error. <Florent Kermarrec>
    * fde0c62 - setup.py: simplify, switch to Python3.6+ (using python_requires), remove version. <Florent Kermarrec>
    * 3dd6185 - soc/cores: use reset_less on datapath/configuration CSRStorages. <Florent Kermarrec>
    * 2a1c2e7 - phy: use reset_less on id/max_request_size/max_payload_size. <Florent Kermarrec>

 * litesata changed from 1e3573b to 2e5c5b1
    * 2e5c5b1 - README: switch to markdown. <Florent Kermarrec>
    * 71e0210 - .travis.yml: fix git clone error. <Florent Kermarrec>
    * e3a980e - setup.py: simplify, switch to Python3.6+ (using python_requires), remove version. <Florent Kermarrec>

 * litescope changed from b3d1e69 to 54488c0
    * 54488c0 - README: switch to markdown. <Florent Kermarrec>
    * 72277ff - examples: use CRG from litex.build. <Florent Kermarrec>
    * a05312d - litex.build: update from migen.genlib.io litex.build.io. <Florent Kermarrec>
    * 5701c52 - .travis.yml: fix git clone error. <Florent Kermarrec>
    * 47819e8 - setup.py: simplify, switch to Python3.6+ (using python_requires), remove version. <Florent Kermarrec>

 * litevideo changed from 49d8126 to 41f3014
    * 41f3014 - README: switch to markdown. <Florent Kermarrec>
    * 6958c21 - setup.py: simplify, switch to Python3.6+ (using python_requires), remove version. <Florent Kermarrec>

 * litex changed from 536ae0e6 to 2d018826
    * 2d018826 - setup.py/install_requires: add requests. <Florent Kermarrec>
    * 5e149ced - build/generic_programmer: add automatic search/download of flash_proxy in repositories if not available locally. <Florent Kermarrec>
    *   a298a9e5 - Merge pull request timvideos#467 from antmicro/region_type_fix <enjoy-digital>
    |\
    | * 77a05b78 - soc_core: Fix region type generation <Mateusz Holenko>
    |/
    * d44fe18b - stream/AsyncFIFO: add default depth (useful when used for CDC). <Florent Kermarrec>
    * ded10c89 - build/sim/core/Makefile: add -p to mkdir modules. <Florent Kermarrec>
    *   c323e94c - Merge pull request timvideos#464 from mithro/litex-sim-fixes <enjoy-digital>
    |\
    | * 97d0c525 - Remove trailing whitespace. <Tim 'mithro' Ansell>
    | * 5a0bb6ee - litex_sim: Rework Makefiles to put output files in gateware directory. <Tim 'mithro' Ansell>
    | * a0658421 - litex_sim: Better error messages on failure to load module. <Tim 'mithro' Ansell>
    * | a8bf0216 - litex_setup: raise exception on update if repository has been been initialized. <Florent Kermarrec>
    * | 4fe31f07 - cores: add External Memory Interface (EMIF) Wishbone bridge. <Florent Kermarrec>
    * |   44746870 - Merge pull request timvideos#462 from ironsteel/trellis-12k <enjoy-digital>
    |\ \
    | |/
    |/|
    | * c57e438d - boards/targets/ulx3s.py: Update --device option help message <Rangel Ivanov>
    | * f4b345ec - build/lattice/trellis.py: Add 12k device <Rangel Ivanov>
    |/
    * d0d2f282 - README: LiteDRAM moved to travis-ci.com as others repositories. <Florent Kermarrec>
    * b95e0a19 - altera/common: add DDROutput, DDRInput, SDROutput, SDRInput. <Florent Kermarrec>
    * 40f43efc - targets: use DDROutput on sdram_clock and similar configuration for all SDRAM targets. <Florent Kermarrec>
    * 292d6b75 - build/xilinx/common: add Spartan6 specialized DDRInput, SDROutput, SDRInput and SDRTristate. <Florent Kermarrec>
    * 88dc5158 - build/io: add SDR Tristate (with infered version) and remove multi-bits support on SDRIO. <Florent Kermarrec>
    * fdadbd86 - build/lattice/common: remove multi-bits support on SDRInput/Output. <Florent Kermarrec>
    * 8159b65b - litex/build/io: also import CRG (since using DifferentialInput). <Florent Kermarrec>
    * 79913e86 - litex.build: update from migen.genlib.io litex.build.io. <Florent Kermarrec>
    * 8e014f76 - litex/build: move io.py from litex/gen and re-import DifferentialInput/Output, DDRInput/Output contributed to Migen. <Florent Kermarrec>
    * 2e270cf2 - platforms/versa_ecp5: remove Lattice Programmer (no longer used since we can now use OpenOCD). <Florent Kermarrec>
    * deebc49a - boards/platforms: cosmetic cleanups. <Florent Kermarrec>
    * 3c0ba8ae - boards/plarforms/ulx3s: cleanup, fix user_leds, add spisdcard, add PULLMODE/DRIVE on SDRAM pins. <Florent Kermarrec>
    * 6c429c99 - build/lattice: add ECP5 implementation for SDRInput/SDROutput. <Florent Kermarrec>
    * 72c8d590 - litex/gen: add io with SDRInput/SDROutput (if not overrided, register is supposed to be infered). <Florent Kermarrec>
    * 8f57321f - tools/litex_sim: remove LiteSPI support for now since breaking Travis-CI of others sub-projects. <Florent Kermarrec>
    * 9afd017a - tools/litex_term: increase workaround delay for usb_fifo. (validated on Minispartan6 and MimasA7). <Florent Kermarrec>
    *   fdfede22 - Merge pull request timvideos#459 from mithro/travis-fix <enjoy-digital>
    |\
    | * cb7e3099 - travis: Run Windows build but allow it to fail. <Tim 'mithro' Ansell>
    | * 43242012 - travis: Use litex_setup.py from the checked out code. <Tim 'mithro' Ansell>
    |/
    *   30f5faf9 - Merge pull request timvideos#458 from david-sawatzke/add_triple <Tim Ansell>
    |\
    | * d69b4443 - Add riscv64-none-elf triple <David Sawatzke>
    |/
    * 14bf8b81 - soc/cores/clock: add Max10PLL. <Florent Kermarrec>
    * 2470ef50 - soc/cores/clock: add Cyclone10LPPLL. <Florent Kermarrec>
    * f8d6d0fd - soc/cores/clock/CycloneVPLL: fix typos. <Florent Kermarrec>
    * 970c8de4 - soc/cores/clock: rename Altera to Intel. <Florent Kermarrec>
    * 383fcd36 - soc/cores/clock: add CycloneVPLL. <Florent Kermarrec>
    * ab4906ea - targets/de0nano: use CycloneIVPLL, remove 50MHz limitation. <Florent Kermarrec>
    * 0f17547c - soc/cores/clock: add initial AlteraClocking/CycloneIV support. <Florent Kermarrec>
    * 3575d03f - .travis.yml: disable windows test (failing for now). <Florent Kermarrec>
    * 2ca853fd - README.md: update RISCV toolchain installation. <Florent Kermarrec>
    * d770bfbf - .travis.yml: remove Python3.5 test. <Florent Kermarrec>
    *   bc26af0d - Merge pull request timvideos#451 from mithro/multi-os <enjoy-digital>
    |\
    | * 3305a65b - Enable testing on multiple Python versions. <Tim 'mithro' Ansell>
    | * 6bd5eae4 - Enable CI for Windows and Mac. <Tim 'mithro' Ansell>
    * | 30d25ffe - setup.py: simplify, switch to Python3.6+ (using python_requires), remove version. <Florent Kermarrec>
    * | 3f1159fa - litex_setup: reorganize a bit, add separators/comments. <Florent Kermarrec>
    * | 926f961b - .travis.yml: revert full url for litex_setup.py. <Florent Kermarrec>
    * | 447e8d94 - Merge pull request timvideos#452 from mithro/riscv-download <enjoy-digital>
    |\|
    | * 9e324d9e - Remove symlinking step. <Tim 'mithro' Ansell>
    | * 7f0ecddf - Use shutil.unpack_archive. <Tim 'mithro' Ansell>
    | * a1dd8fc8 - Ignore SSL errors on CI. <Tim 'mithro' Ansell>
    | * 2b2aff12 - Improve the path messages a little. <Tim 'mithro' Ansell>
    | * 141644d1 - Make travis use litex_setup.py for GCC download. <Tim 'mithro' Ansell>
    | * 6adabae7 - Adding SiFive RISC-V toolchain downloading to litex_setup.py <Tim 'mithro' Ansell>
    | * 59b7db63 - Fix alignments. <Tim 'mithro' Ansell>
    |/
    *   e408fb8f - Merge pull request timvideos#450 from mithro/litex-setup-fix <enjoy-digital>
    |\
    | * d781bf20 - Run `litex_setup.py` outside the git clone directory. <Tim 'mithro' Ansell>
    | * dd59dac5 - litex_setup: Use subprocess so failures are noticed. <Tim 'mithro' Ansell>
    |/
    * 0f352cd6 - soc/cores: use reset_less on datapath/configuration CSRStorages. <Florent Kermarrec>
    * a67ab418 - interconnect/csr: add reset_less parameter. <Florent Kermarrec>
    * 05b1b778 - interconnect/csr, wishbone: use reset_less on datapath signals. <Florent Kermarrec>
    * b95965de - cores/code_8b10b: set reset_less to True on datapath signals. <Florent Kermarrec>
    * a35df4f7 - stream: set reset_less to True on datapath signals. <Florent Kermarrec>
    *   cf1c5d99 - Merge pull request timvideos#448 from kessam/patch-1 <enjoy-digital>
    |\
    | * fb532f5e - Fix timing constraints <kessam>
    |/
    * 60431083 - soc/cores/clock/ECP5PLL: add CLKI_DIV support. <Florent Kermarrec>
    *   27f00851 - Merge pull request timvideos#447 from antmicro/spi-xip <enjoy-digital>
    |\
    | * 81be74a7 - targets: netv2: add LiteSPI <Piotr Binkowski>
    | * 946cb164 - platform: netv2: update SPI flash pinout <Piotr Binkowski>
    | * 31fceb0a - litex_sim: add LiteSPI <Piotr Binkowski>
    | * ff04869c - litex_setup: add litespi core <Piotr Binkowski>
    * | 91981b96 - soc/cores/uart: use reset_less on accumulator, reg, bitcount to reduce. <Florent Kermarrec>
    * | 87160059 - soc/cores/spi_flash: add ECP5SPIFlash (non-memory-mapped). <Florent Kermarrec>
    * |   e3445f6c - Merge pull request timvideos#444 from ilya-epifanov/openocd-jtag-programmer <enjoy-digital>
    |\ \
    | * | 351551a0 - Added openocd jtagspi programmer, to be used with ECP5-EVN board <Ilya Epifanov>
    * | |   aeb9411a - Merge pull request timvideos#441 from gsomlo/gls-spisdcard-fixes <enjoy-digital>
    |\ \ \
    | * | | 8473ed56 - software/bios: add spisdcardboot() to boot_sequence() <Gabriel Somlo>
    | * | | e9054ef6 - software/libbase/spisdcard: add delay to goidle loop <Gabriel Somlo>
    | * | | c6b6dee2 - software/bios: factor out busy_wait() function <Gabriel Somlo>
    | * | | 540218b2 - software/libbase/spisdcard: fix width of address parameter <Gabriel Somlo>
    |/ / /
    * | | 2e48ab56 - soc/cores/spi: make dynamic clk divider optional (can be enabled with add_clk_divider method) and only use it in add_spi_sdcard. <Florent Kermarrec>
    * | |   86eec1a4 - Merge pull request timvideos#439 from antmicro/fix-compiler-rt <enjoy-digital>
    |\ \ \
    | |_|/
    |/| |
    | * | 5fa2cc66 - Update removed llvm compiler-rt repo <Kamil Rakoczy>
    |/ /
    * | 4abb3715 - targets/add_constant: avoid specifying value when value is None (=default). <Florent Kermarrec>
    * | 73b43475 - software/libbase/spisdcard: add USE_SPISDCARD_RECLOCKING define to easily disable reclocking. <Florent Kermarrec>
    * | b509df8b - integration/soc/add_uart: add USB CDC support (with ValentyUSB core). <Florent Kermarrec>
    * | 76872a7a - tools/litex_sim: simplify using uart_name=sim. <Florent Kermarrec>
    * | 09a3ce0e - integration/soc/add_uart: add Model/Sim. <Florent Kermarrec>
    * | 3f43c6a2 - integration/soc/add_uart: cleanup. <Florent Kermarrec>
    |/
    * 5bcf730c - build/tools: add replace_in_file function. <Florent Kermarrec>
    * ffe83ef0 - tools/litex_term: use 64 bytes as default payload_lengh (work for all confniguration) and add small delay between frames for FT245 FIFO. <Florent Kermarrec>
    * 8f2e3692 - bios/boot: update comments. <Florent Kermarrec>
    *   1746b57a - Merge pull request timvideos#437 from feliks-montez/bugfix/fix-serialboot-frames <enjoy-digital>
    |\
    | * ebdc38fc - flush rx buffer when bad crc and fix frame payload length <Feliks>
    * | c154d8d2 - test/test_targets: remove versa_ecp3. <Florent Kermarrec>
    * | 8d999081 - boards/targets: update SDRAM to use new GENSDRPHY and new ECP5PLL phase support. <Florent Kermarrec>
    * | 3eb08c7d - boards/platforms: remove versa_ecp3 (ECP3 no longer supported). <Florent Kermarrec>
    * | eb641695 - build/lattice/diamond: remove ECP3 support. (ECP3 is not used and no longer interesting now that ECP5 has an open-source toolchain). <Florent Kermarrec>
    * | bba5f182 - cores/clock/ECP5PLL: add phase support. <Florent Kermarrec>
    * | 0123ccc8 - build/lattice/common: change LatticeECPXDDROutputImpl from ECP3 to ECP5. <Florent Kermarrec>
    * | 5a402264 - Fix off-by-one error on almost full condition for prefetch <bunnie>
    |/
    * d62ef38c - soc/doc/csr: allow CSRField.reset to be a Migen Constant. <Florent Kermarrec>
    * 4adac90d - cpu/vexriscv/mem_map_linux: move main_ram to allow up to 1GB. <Florent Kermarrec>
    * 63ab2ba4 - software/bios/boot/linux: move emulator.bin to main_ram and allow defining custom ram offsets. <Florent Kermarrec>
    * d9984754 - targets: remove Etherbone imports. <Florent Kermarrec>
    * 3b04efbc - targets: switch to add_etherbone method. <Florent Kermarrec>
    * 5ad7a3b7 - integration/soc: add add_etherbone method. <Florent Kermarrec>
    * d6b0819e - integration/soc/add_ethernet: add name parameter (defaults to ethmac). <Florent Kermarrec>
    * 930679ef - targets: always use sys_clk_freq on SDRAM modules. <Florent Kermarrec>
    * ae6ef923 - targets: fix typos in previous changes. <Florent Kermarrec>
    *   c547b2cc - Merge pull request timvideos#436 from rob-ng15/master <enjoy-digital>
    |\
    | * 2bf31a31 - Reclock spi sdcard access after initialisation <rob-ng15>
    * |   011773af - Merge pull request timvideos#435 from enjoy-digital/spi_master_clk_divider <enjoy-digital>
    |\ \
    | |/
    |/|
    | * 61c9e54a - soc/core/spi: add Clk Divider CSR (defaults to sys_clk_freq/spi_clk_freq). <Florent Kermarrec>
    * | f03d862c - targets: switch to add_ethernet method instead of EthernetSoC. <Florent Kermarrec>
    * | 4e9a8ffe - targets: switch to SoCCore/add_sdram instead of SoCSDRAM. <Florent Kermarrec>
    |/
    * dd7718b4 - targets/arty: use new ISERDESE2 MEMORY mode. <Florent Kermarrec>
    *   fca52d11 - Merge branch 'master' of http://github.com/enjoy-digital/litex <Florent Kermarrec>
    |\
    | *   0f356648 - Merge pull request timvideos#434 from rob-ng15/master <enjoy-digital>
    | |\
    | | * f3c23377 - Use <stdint.h> to provide structure sizes <rob-ng15>
    | | * c2ebbcbf - Use <stdint.h> for structure sizes <rob-ng15>
    | |/
    * / ccf73639 - integration/soc: add add_spi_flash method to add SPI Flash support to the SoC. <Florent Kermarrec>
    |/
    * ec3e0686 - targets/nexys4ddr: use LiteXSoC's add_spi_sdcard method. <Florent Kermarrec>
    * d276036f - integration/soc: add add_spi_sdcard method to add SPI mode SDCard support to the SoC. <Florent Kermarrec>
    *   60445709 - Merge pull request timvideos#433 from gsomlo/gls-rocket-spisdcard <enjoy-digital>
    |\
    | * b960d7c5 - targets/nexys4ddr: add '--with-spi-sdcard' build option <Gabriel Somlo>
    | * 7a7b8905 - platforms/nexys4ddr: add spisdcard pins. <Gabriel Somlo>
    | * af4de03f - targets/nexys4ddr: make sdcard reset conditional <Gabriel Somlo>
    | * a33916bc - software/libbase/spisdcard: fix 4-byte FAT fields on 64-bit CPUs <Gabriel Somlo>
    | * 1f90abea - bios: make SPI SDCard boot configs other than linux-on-litex-vexriscv <Gabriel Somlo>
    | * c2938dc9 - bios/boot.c: cosmetic: re-indent spisdcardboot() for consistency <Gabriel Somlo>
    * |   fbadfa17 - Merge pull request timvideos#432 from esden/csr-doc-fix-int <Sean Cross>
    |\ \
    | |/
    |/|
    | * 27988672 - Don't let python convert lane number to float. <Piotr Esden-Tempski>
    |/
    *   dd07a0ad - Merge pull request timvideos#431 from antmicro/hybrid-mac <enjoy-digital>
    |\
    | * 96a265a4 - litex_sim: add support for hybrid mac <Piotr Binkowski>
    * 37f25ed3 - software/libbase/bios: rename spi.c/h to spisdcard.h, also rename functions. <Florent Kermarrec>
    * 93925634 - software/bios/main: revert USDDRPHY_DEBUG (merge issue with SPI SD CARD PR). <Florent Kermarrec>
    *   8fe9e72f - Merge pull request timvideos#429 from rob-ng15/master <enjoy-digital>
    |\
    | * 27720409 - SPI hardware bitbanging from SD CARD <rob-ng15>
    | * d45dda73 - SPI hardware bitbanging from SD CARD <rob-ng15>
    | * 50b6db6a - SPI hardware bitbanging from SD CARD <rob-ng15>
    * |   9e1cd842 - Merge pull request timvideos#430 from gsomlo/gls-sdclk-stub <enjoy-digital>
    |\ \
    | * | b2103f4a - bios/sdcard: provide sdclk_set_clk() stub for clocker-less targets <Gabriel Somlo>
    |/ /
    * / e8651629 - platforms/kcu105: fix pcie tx0 p/n swap. <Florent Kermarrec>
    |/
    * 2c4b8963 - soc/cores/clock: make sure specific clkoutn_divide_range is only used as a fallback solution. <Florent Kermarrec>

 * litex-boards changed from a7fbe0a to cb95962
    * cb95962 - targets/ulx3s and colorlight_5a_75b: cleanup USB ACM addition and only keep USB ACM changes. <Florent Kermarrec>
    *   4b4f2f9 - Merge pull request timvideos#67 from mubes/ecp5_usb <enjoy-digital>
    |\
    | * f79a010 - Addition of flash for colorlight board <Dave Marples>
    | * 389e8aa - Addition of USB ACM for ECP5 <Dave Marples>
    |/
    * a12faae - targets/colorlight_5a_75b: increase sys_ps phase (fixes memtest). <Florent Kermarrec>
    * 52c9648 - arty_s7: fix copyrights, rename to arty_s7, various minor changes to make it similar to others targets. <Florent Kermarrec>
    *   0cee59c - Merge pull request timvideos#65 from Fatsie/artys7 <enjoy-digital>
    |\
    | * bbb1ded - Added Arty S7 board <Staf Verhaegen>
    |/
    * 188d4a4 - targets: use DDROutput on sdram_clock and similar configuration for all SDRAM targets. <Florent Kermarrec>
    * ca197af - targets/simple: use CRG from litex.build. <Florent Kermarrec>
    * b8a648d - litex.build: update from migen.genlib.io litex.build.io. <Florent Kermarrec>
    * 4d7135f - platforms/versa_ecp5: remove LatticeProgrammer (no longer used since we can now use OpenOCD). <Florent Kermarrec>
    * 2cf3c3e - platforms: cosmetic cleanups. <Florent Kermarrec>
    * df5de88 - platforms/ulx3s: cleanup, fix user_leds, add PULLMODE/DRIVE constraints on SDRAM. <Florent Kermarrec>
    * 467b14a - colorlight_5a_75b: minor comment changes. <Florent Kermarrec>
    *   7157b40 - Merge pull request timvideos#64 from david-sawatzke/improve_colorlight_v6.1 <enjoy-digital>
    |\
    | * 15a27d4 - targets/colorlight_5a_75b: Change baudrate to work on v6.1 <David Sawatzke>
    | * 4fc9df8 - colorlight_5a_75b/v6.1: Add eth_clock & serial pins <David Sawatzke>
    | * 4ddde31 - colorlight_5a_75b/v6.1: Fix bank activate pin <David Sawatzke>
    |/
    * a80737e - test/test_targets: fix typo. <Florent Kermarrec>
    *   9b3f16a - Merge pull request timvideos#62 from ilya-epifanov/ecp5-evn-button1-and-spi-flash-ios <enjoy-digital>
    |\
    | * a43072a - ECP5-EVN board: Added BUTTON_1 and SPI flash pins to IOs <Ilya Epifanov>
    * db67dff - targets/de10lite: use Max10PLL, remove 50MHz limitation. <Florent Kermarrec>
    * 9fe9821 - test/test_targets: add c10lprefkit. <Florent Kermarrec>
    * 8ccab03 - targets/c10lprefkit: use Cyclone10LPPLL, remove 50MHz limitation. <Florent Kermarrec>
    * 4cdc121 - targets/de10nano: use CycloneVPLL, remove 50MHz limitation. <Florent Kermarrec>
    * 2d8a4ef - targets/de1_soc: use CycloneVPLL, remove 50MHz limitation. <Florent Kermarrec>
    * cec4cbb - targets/de2_115: use CycloneIVPLL, remove 50MHz limitation. <Florent Kermarrec>
    * 1fac607 - targets/de0nano: use CycloneIVPLL, remove 50MHz limitation. <Florent Kermarrec>
    * 5f629c2 - targets/vcu118: fix clk500 typo. <Florent Kermarrec>
    * d7b9212 - .travis.yml: fix git clone error. <Florent Kermarrec>
    * 5e1da47 - setup.py: simplify, switch to Python3.6+ (using python_requires), remove version. <Florent Kermarrec>

 * migen changed from 0.6.dev-335-g3f9809b to 0.6.dev-337-g19d5eae
    * 19d5eae - zc706: fix user_led I/O standards <Sebastien Bourdeauducq>
    * 21fea57 - zc706: fix indentation/style <Sebastien Bourdeauducq>

Full submodule status
--
 3a6108a75be356a3dc53760d22782f1323248b6b edid-decode (remotes/origin/HEAD)
 3a06aa84b62ad24467fb0d2c6ceddf565e9ea447 flash_proxies (remotes/origin/HEAD)
 de55a8e17046ffd6bf68d1c0d606088abdb37950 litedram (remotes/origin/HEAD)
 705003e5231436de9a276e8f834564c6fbe90a1e liteeth (remotes/origin/HEAD)
 6fdd02058fba29008c90b162e0ef707dce15ebeb liteiclink (remotes/origin/HEAD)
 586ef787946512087a64fb60b79bdafe39aee6d0 litepcie (remotes/origin/HEAD)
 2e5c5b12d52f695f4560ca7dd08b4170d7568715 litesata (remotes/origin/HEAD)
 54488c0f4d6e9e953f1a0de3d578915a5e4ccddf litescope (remotes/origin/HEAD)
 7457a29b1a47fe15e81fa37f3bbdd510788f1d53 liteusb (heads/master)
 41f30143075ece3fff5c33a332ed067d1837cbb3 litevideo (remotes/origin/HEAD)
 2d018826532e486b94615c6b9cee4f16a924dba2 litex (remotes/origin/HEAD)
 cb959628506e61cae2d7be05276bba8f42138cfb litex-boards (remotes/origin/HEAD)
 7da392963878842f93f09a7a218c1052ae5e45d6 litex-renode (realign_memory.0~2)
 19d5eae29b9ff57ea11540252f79ad1a9526ff3a migen (0.6.dev-337-g19d5eae)
 8f5a253b22cd4ebcd56304a3662f4c70e3b34ed5 nmigen (v0.1-69-g8f5a253)