Start of public OpenTitan development history

Code contributors:
Alex Bradbury <asb@lowrisc.org>
Cindy Chen <chencindy@google.com>
Eunchan Kim <eunchan@google.com>
Gaurang Chitroda <gaurangg@google.com>
Mark Hayter <mark.hayter@gmail.com>
Michael Schaffner <msf@google.com>
Miguel Osorio <miguelosorio@google.com>
Nils Graf <nilsg@google.com>
Philipp Wagner <phw@lowrisc.org>
Pirmin Vogel <vogelpi@lowrisc.org>
Ram Babu Penugonda <rampenugonda@google.com>
Scott Johnson <scottdj@google.com>
Shail Kushwah <kushwahs@google.com>
Srikrishna Iyer <sriyer@google.com>
Steve Nelson <Steve.Nelson@wdc.com>
Tao Liu <taliu@google.com>
Timothy Chen <timothytim@google.com>
Tobias Wölfel <tobias.woelfel@mailbox.org>
Weicai Yang <weicai@google.com>
diff --git a/hw/top_earlgrey/top_earlgrey.core b/hw/top_earlgrey/top_earlgrey.core
new file mode 100644
index 0000000..731fb8a
--- /dev/null
+++ b/hw/top_earlgrey/top_earlgrey.core
@@ -0,0 +1,51 @@
+CAPI=2:
+# Copyright lowRISC contributors.
+# Licensed under the Apache License, Version 2.0, see LICENSE for details.
+# SPDX-License-Identifier: Apache-2.0
+name: "lowrisc:systems:top_earlgrey:0.1"
+description: "Technology-independent Earl Grey toplevel"
+filesets:
+  files_rtl_generic:
+    depend:
+      - lowrisc:ip:uart:0.1
+      - lowrisc:ip:gpio
+      - lowrisc:ip:rv_core_ibex
+      - lowrisc:ip:rv_dm
+      - lowrisc:ip:rv_plic_component
+      - lowrisc:ip:rv_timer
+      - lowrisc:ip:tlul
+      - lowrisc:ip:spi_device
+      - lowrisc:ip:hmac
+      - lowrisc:prim:ram_1p
+      - lowrisc:prim:rom
+      - lowrisc:prim:flash
+      - lowrisc:ip:flash_ctrl:0.1
+      - lowrisc:constants:top_pkg
+    files:
+      - rtl/tl_main_pkg.sv
+      - rtl/xbar_main.sv
+      - rtl/rv_plic_reg_pkg.sv
+      - rtl/rv_plic_reg_top.sv
+      - rtl/rv_plic.sv
+      - rtl/padctl.sv
+      - rtl/top_earlgrey.sv
+    file_type: systemVerilogSource
+
+parameters:
+  SYNTHESIS:
+    datatype: bool
+    paramtype: vlogdefine
+  ASIC_SYNTHESIS:
+    datatype: bool
+    paramtype: vlogdefine
+
+targets:
+  default: &default_target
+    filesets:
+      - files_rtl_generic
+    toplevel: top_earlgrey
+  sim:
+    default_tool: icarus
+    filesets:
+      - files_rtl_generic
+    toplevel: top_earlgrey