diff --git a/.gitignore b/.gitignore
new file mode 100644
index 00000000..6f2674aa
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,66 @@
+# Compiled output
+*.bin
+*.d
+*.elf
+*.hex
+*.srec
+host/build/
+
+# Operating system spew
+.DS_Store
+.Spotlight-V100
+.Trashes
+ehthumbs.db
+Thumbs.db
+
+# Editor junk
+*.swp
+*.sublime-project
+*.sublime-workspace
+
+# Xilinx tools create an enormous amount of poop:
+firmware/cpld/**/isim/
+firmware/cpld/**/_ngo/
+firmware/cpld/**/_xmsgs/
+firmware/cpld/**/iseconfig/
+firmware/cpld/**/*_html/
+firmware/cpld/**/xlnx_auto_0_xdb/
+firmware/cpld/**/xst/
+firmware/cpld/**/_*.cmd
+firmware/cpld/**/_*.log
+firmware/cpld/**/*.bld
+firmware/cpld/**/*.chk
+firmware/cpld/**/*.cmd
+firmware/cpld/**/*.cmd_log
+firmware/cpld/**/*.csv
+firmware/cpld/**/*.cxt
+firmware/cpld/**/*.dat
+firmware/cpld/**/*.err
+firmware/cpld/**/*.exe
+firmware/cpld/**/*.gise
+firmware/cpld/**/*.gyd
+firmware/cpld/**/*.html
+firmware/cpld/**/*.ini
+firmware/cpld/**/*.ipf
+firmware/cpld/**/*.log
+firmware/cpld/**/*.lso
+firmware/cpld/**/*.mfd
+firmware/cpld/**/*.ng[acdr]
+firmware/cpld/**/*.pad
+firmware/cpld/**/*.phd
+firmware/cpld/**/*.pnx
+firmware/cpld/**/*.prj
+firmware/cpld/**/*.rpt
+firmware/cpld/**/*.stx
+firmware/cpld/**/*.syr
+firmware/cpld/**/*.tim
+firmware/cpld/**/*.tspec
+firmware/cpld/**/*.vm6
+firmware/cpld/**/*.wcfg
+firmware/cpld/**/*.wdb
+firmware/cpld/**/*.xml
+firmware/cpld/**/*.xmsgs
+firmware/cpld/**/*.xrpt
+firmware/cpld/**/*.xsl
+firmware/cpld/**/*.xst
+firmware/cpld/**/*.xwbt