README: Updates to toolchain and urls

The toolchain is no longer found on opencores.org, point to openrisc.io
and Embecosm.

README

@@ -9,15 +9,17 @@ This is OpenRISC 1000 architectural simulator. See the file COPYING
 for copying permission. To contact the authors, see the AUTHORS file.
 
 This simulator loads an assembly file for one of the both architectures
-and it simulates the operation of instructions. 
+and it simulates the operation of instructions.
 
 
 Pre-requisites
 ==============
 
 The GNU toolchain for OpenRISC 1000 is required to compile programs for use
-with Or1ksim. Instructions how to build these GNU tools can be found on
-www.opencores.org
+with Or1ksim. The OpenRISC toolchains are upstream and cross compilers can be
+found in most populate Linux distributions.  However, the most trusted toolchain
+builds are those from Embecosm:
+https://www.embecosm.com/resources/tool-chain-downloads/#openrisc-stable
 
 Both the tool chain and DejaGnu are need to run the test suite.
 
@@ -32,7 +34,7 @@ in the user guide, which can be found in the 'doc' subdirectory.
 GNU Tools
 =========
 
-Instructions how to build GNU tools can be found on www.opencores.org, or in
+Instructions how to build GNU tools can be found on openrisc.io, or in
 the Embecosm Application Note EAN2: "The OpenCores OpenRISC 1000 Simulator and
 Tool Chain: Installation Guide" <www.embecosm.com/download/ean2.html>.
 
@@ -62,8 +64,8 @@ may be obtained by running the command:
 from the top level directory.
 
 
-OpenRISC and OpenCores
-======================
+OpenRISC
+========
 
 This project is licensed under the GNU Public License version 3. See the file
 COPYING for details.
@@ -73,8 +75,8 @@ IP (intellectual property) cores. We design open source, synthesizable
 cores. OpenRISC is one such core. It is a 32-bit RISC microprocessor that
 will run GNU/Linux.
 
-For more information visit us at http://www.opencores.org.
+For more information visit us at https://openrisc.io.
 
 
-Upated by Jeremy Bennett (jeremy.bennett@embecosm.com)
-22 June 2010
+Upated by Stafford Horne (shorne@gmail.com)
+2024-08-25