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README: update xilinx section

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Gwenhael Goavec-Merou 2021-02-04 07:29:57 +01:00
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@ -264,29 +264,45 @@ configured in SPI mode and sfl primitive used to access EPCQ SPI flash.**
This interface is used for SPI communication only when the dedicated svf is
loaded in RAM, rest of the time, user is free to use for what he want.**
### ARTY and Spartan Edge Accelerator Board
### <span style="text-decoration:underline">Xilinx based boards</span>
To simplify further explanations, we consider the project is generated in the
current directory.
**Note: Spartan Edge Accelerator Board has only pinheader, so the cable must be
provided**
**Note:**
1. Spartan Edge Accelerator Board has only pinheader, so the cable must be provided
2. a *JTAG* <-> *SPI* bridge (used to write bitstream in FLASH) is available for some device, see
[spiOverJtag](https://github.com/trabucayre/openFPGALoader/tree/master/spiOverJtag) to check if your model is supported
#### loading in memory:
<span style="color:red">**Warning** *.bin* may be loaded in memory or in flash, but this extension is a classic extension
for CPU firmware and, by default, *openFPGALoader* load file in memory, double check
*-m* / *-f* when you want to use a firmware for a softcore
(or anything, other than a bitstream) to write somewhere in the FLASH device).</span>
*.bit* file is the default format generated by *vivado*, so nothing special
task must be done to generates this bitstream.
*.bin* is not, by default, produces. To have access to this file you need to configure the tool:
- **GUI**: *Tools* -> *Settings* -> *Bitstreams* -> check *-bin_file*
- **TCL**: append your *TCL* file with `set_property STEPS.WRITE_BITSTREAM.ARGS.BIN_FILE true [get_runs impl_1]`
#### loading in memory:
<span style="text-decoration:underline">*.bit* and *.bin* are allowed to be loaded in memory.</span>
__file load:__
```bash
openFPGALoader -b arty *.runs/impl_1/*.bit
openFPGALoader [-m] -b arty *.runs/impl_1/*.bit (or *.bin)
```
or
```bash
openFPGALoader -b spartanEdgeAccelBoard -c digilent_hs2 *.runs/impl_1/*.bit
openFPGALoader [-m] -b spartanEdgeAccelBoard -c digilent_hs2 *.runs/impl_1/*.bit (or *.bin)
```
#### SPI flash (only for ARTY):
#### SPI flash:
<span style="text-decoration:underline">*.bit*, *.bin*, and *.mcs* are supported for FLASH.</span>
.mcs must be generates through vivado with a tcl script like
```tcl
set project [lindex $argv 0]
@ -309,8 +325,10 @@ vivado -nolog -nojournal -mode batch -source script.tcl -tclargs myproject
__file load:__
```bash
openFPGALoader -b arty *.runs/impl_1/*.mcs
openFPGALoader -f -b arty *.runs/impl_1/*.mcs (or .bit / .bin)
```
**Note: *-f* is required to write bitstream (without them *.bit* and *.bin* are loaded in memory)**
### MachXO2/MachXO3 Starter Kit
#### Flash memory: