better tagline

[trilby-hat-fpga] / README.md

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--- a/README.md
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@@ -1,4 +1,31 @@
-# Trilby HAT ECP5 45k FPGA
+# Trilby HAT ECP5 FPGA SDR for Raspberry Pi
+
+http://www.kinetic.co.uk/Trilby.php
+
+This is my attempt at using open source tools to generate bitstream
 
 Run `make prog` to load the example to the board.
 
+
+## enable RTC
+
+Add to config.txt:
+
+```
+dtoverlay=i2c-rtc,ds1307
+```
+
+or execute in shell:
+
+```
+echo ds1307 0x68 > /sys/class/i2c-adapter/i2c-1/new_device
+```
+
+
+## read HAT ID eeprom
+
+Add to config.txt:
+
+```
+dtoverlay=i2c-gpio,i2c_gpio_sda=0,i2c_gpio_scl=1,bus=4
+```