targets/Ultrascale(+): Generate Reset to idelay clock domain (to be sure to follow UG571 reset sequence).

Tested with: ./icebreaker.py --cpu-type=serv --with-video-terminal --build --flash

https://twitter.com/enjoy_digital/status/1365324823447171074

README.md: fix typo

Numato sdcard pmod for Arty

Add board support for Terasic/Arrow DECA board (Intel Max10)

target/arty: add eth_ip_configurable switch

The default stays with the Digilent/Antmicro layout, but the user can
optionally provide --sdcard-adaptor numato to use the Numato layout.

Signed-off-by: Joel Stanley <joel@jms.id.au>

It has a different layout.

Thanks to David for documenting the pinout in this issue:
https://github.com/enjoy-digital/litex/issues/817



 Expansion Pin 	SD 	SPI SD 	Artix 	Arty-A7 	PMOD PIN 	PMOD Index
 2 		DATA_2 	  	D4 	JD1 		1 		0
 4 		CMD 	MOSI 	D3 	JD2 		2 		1
 6 		DATA_0 	MISO 	F4 	JD3 		3 		2
   		CD 	  	F3 	JD4 		4 		3
 1 		DATA_3 	CS_N 	E2 	JD7 		7 		4
 3 		CLK 	CLK 	D2 	JD8 		8 		5
 5 		DATA_1 	  	H2 	JD9 		9 		6
   	  		  	G2 	JD10

Signed-off-by: Joel Stanley <joel@jms.id.au>

fix vc707 default_clk_period

targets/sds1104xe/BaseSoC: Enable Etherbone by default also defaults to Crossover UART when kwargs is empty.

sockit: Add an option to plug in an UART via the GPIO daughter board, make connector pin numbers one-based

platforms/sds1104xe: fix ddram IOStandard (SSTL15, thanks @tmbinc) and add INTERNAL_VREF on ddram banks.

platform/de10nano: fix programmer (thanks @Godtec, see https://github.com/enjoy-digital/litex/pull/811).

vc707.py: clk156 add missing constraint

arrow_sockit: add support for MiSTer XS SDRAM modules

nexys_video: enable symbiflow toolchain

Signed-off-by: Jan Kowalewski <jkowalewski@antmicro.com>

targets/colorlight_i5: use .bit stream instead of .svf when loading.

Be friendlier about incompatible options.

./tec0117.py --build --load

Still some FIXMEs but validate use of the embedded SDRAM with LiteDRAM/LiteX:

        __   _ __      _  __
       / /  (_) /____ | |/_/
      / /__/ / __/ -_)>  <
     /____/_/\__/\__/_/|_|
   Build your hardware, easily!

 (c) Copyright 2012-2020 Enjoy-Digital
 (c) Copyright 2007-2015 M-Labs

 BIOS built on Feb  1 2021 13:09:35
 BIOS CRC passed (5abceb2e)

 Migen git sha1: 40b1092
 LiteX git sha1: f324f953

--=============== SoC ==================--
CPU:		VexRiscv_Lite @ 25MHz
BUS:		WISHBONE 32-bit @ 4GiB
CSR:		32-bit data
ROM:		24KiB
SRAM:		4KiB
L2:		0KiB
SDRAM:		8192KiB 16-bit @ 25MT/s (CL-2 CWL-2)

--========== Initialization ============--
Initializing SDRAM @0x40000000...
Switching SDRAM to software control.
Switching SDRAM to hardware control.
Memtest at 0x40000000 (2MiB)...
  Write: 0x40000000-0x40200000 2MiB
   Read: 0x40000000-0x40200000 2MiB
Memtest OK
Memspeed at 0x40000000 (2MiB)...
  Write speed: 5MiB/s
   Read speed: 6MiB/s

--============== Boot ==================--
Booting from serial...
Press Q or ESC to abort boot completely.
sL5DdSMmkekro
Timeout
No boot medium found

--============= Console ================--

litex> mem_list

Available memory regions:
ROM       0x00000000 0x6000
SRAM      0x01000000 0x1000
SPIFLASH  0x80000000 0x1000000
MAIN_RAM  0x40000000 0x800000
CSR       0x82000000 0x10000

litex> mem_test 0x40000000 0x800000

Memtest at 0x40000000 (8MiB)...
  Write: 0x40000000-0x40800000 8MiB
   Read: 0x40000000-0x40800000 8MiB
Memtest OK

litex>