Introduce Rust FSBL

This PR introduces some major features while also changing the project structure to be more flexible
for multiple platforms (e.g. host tooling).

Added features:

1. Pure Rust FSBL for the Zedboard. This first variant is simplistic. It
   is currently only capable of QSPI boot. It searches for a bitstream
   and ELF file inside the boot binary, flashes them and jumps to them.
2. DDR, QSPI, private CPU timer modules
3. Tooling to auto-generate board specific DDR and DDRIOB config
   parameters from the vendor provided ps7init.tcl file

Changed project structure:

1. All target specific project are inside a dedicated workspace inside
   the `zynq` folder now.
2. All tool intended to be run on a host are inside a `tools` workspace
3. All other common projects are at the project root

scripts/zynq7000-init.py

@@ -7,7 +7,7 @@ import sys
 from pathlib import Path
 
 # Define the default values
-TCL_SCRIPT_NAME = "xsct-init.tcl"
+TCL_SCRIPT_NAME = "xsct-flasher.tcl"
 SCRIPTS_DIR = "scripts"
 DEFAULT_IP_ADDRESS_HW_SERVER = "localhost"
 
@@ -55,7 +55,7 @@ def main():
         default=os.getenv("TCL_INIT_SCRIPT"),
         help="Path to the ps7 initialization TCL file to prepare the processing system.\n"
         "You can also set the TCL_INIT_SCRIPT env variable to set this.\n"
-        "It is also set implicitely when specifying the SDT folder with --sdt"
+        "It is also set implicitely when specifying the SDT folder with --sdt",
     )
     parser.add_argument(
         "-b",
@@ -63,7 +63,7 @@ def main():
         dest="bit",
         default=os.getenv("ZYNQ_BITSTREAM"),
         help="Optional path to the bitstream which will also be programed to the device. It is"
-        " also searched automatically if the --sdt option is used.\n"
+        " also searched automatically if the --sdt option is used.\n",
     )
 
     args = parser.parse_args()
@@ -91,9 +91,6 @@ def main():
         print(f"The app '{args.app}' does not exist")
         sys.exit(1)
 
-    # Export environment variables
-    if args.app:
-        os.environ["APP"] = args.app
     os.environ["IP_ADDRESS_HW_SERVER"] = args.ip
     init_tcl = None
     bitstream = None
@@ -124,7 +121,9 @@ def main():
             bitstream = args.bit
         init_tcl = args.init_tcl
 
-    xsct_script = Path(TCL_SCRIPT_NAME)
+    # Get the script's directory
+    script_dir = Path(__file__).resolve().parent
+    xsct_script = script_dir / TCL_SCRIPT_NAME
 
     if not xsct_script.exists():
         xsct_script = Path(os.path.join(SCRIPTS_DIR, TCL_SCRIPT_NAME))
@@ -136,7 +135,11 @@ def main():
     # Prepare tcl_args as a list to avoid manual string concatenation issues
     cmd_list = ["xsct", str(xsct_script), init_tcl]
     if bitstream:
+        cmd_list.append("--bit")
         cmd_list.append(bitstream)
+    if args.app:
+        cmd_list.append("--app")
+        cmd_list.append(args.app)
 
     # Join safely for shell execution
     xsct_cmd = shlex.join(cmd_list)