complete README: install/help/usage

README.md

@@ -1,3 +1,56 @@
 # cycloader
-tool for programming FPGA. Currently Trenz cyc1000 (memory and spi flash) and
-Digilent arty 35T (memory) are supported
+tool for programming FPGA. 
+
+Current support:
+* Trenz cyc1000 Cyclone 10 LP 10CL025 (memory and spi flash)
+* Digilent arty 35T (memory)
+
+## compile and install
+
+This application uses libftdi1, so this library must be installed (and,
+depending of the distribution, headers too)
+```bash
+apt-get install libftdi1-2 libftdi1-dev libftdipp1-3 libftdipp1-dev
+```
+
+To build the app:
+```bash
+$ make
+```
+To install
+```bash
+$ sudo make install
+```
+Currently, the install path is hardcoded to /usr/local
+
+## Usage
+
+```bash
+cycloader --help
+Usage: cycloader [OPTION...] BIT_FILE
+cycloader -- a program to flash cyclone10 LP FPGA
+
+  -b, --board=BOARD          board name, may be used instead of cable
+  -c, --cable=CABLE          jtag interface
+  -d, --display              display FPGA and EEPROM model
+  -o, --offset=OFFSET        start offset in EEPROM
+  -r, --reset                reset FPGA after operations
+  -v, --verbose              Produce verbose output
+  -?, --help                 Give this help list
+      --usage                Give a short usage message
+  -V, --version              Print program version
+
+```
+To have complete help
+
+### CYC1000
+
+loading in memory:
+```bash
+cycloader -b cyc1000 /somewhere/file.svf
+```
+
+SPI flash:
+```bash
+cycloader -b cyc1000 -r /somewhere/file.rpd
+```