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). It also includes a lot of
bugfixes, renamings for consistency purposes and dependency updates.

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. QSPI flasher for the Zedboard.
3. DDR, QSPI, DEVC, private CPU timer and PLL configuration 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

Major bugfixes:

1. SPI module: CPOL was not configured properly
2. Logger flush implementation was empty, implemented properly now.

README.md

@@ -6,36 +6,60 @@ family of SoCs.
 
 # List of crates
 
-This workspace contains the following crates:
+This project contains the following crates:
 
-- The [`zynq7000-rt`](https://egit.irs.uni-stuttgart.de/rust/zynq7000-rs/src/branch/main/zynq7000-rt)
+## [Zynq Workspace](https://egit.irs.uni-stuttgart.de/rust/zynq7000-rs/src/branch/main/zynq)
+
+This workspace contains libraries and application which can only be run on the target system.
+
+- The [`zynq7000-rt`](https://egit.irs.uni-stuttgart.de/rust/zynq7000-rs/src/branch/main/zynq/zynq7000-rt)
   run-time crate containing basic low-level startup code necessary to boot a Rust app on the
   Zynq7000.
-- The [`zynq7000`](https://egit.irs.uni-stuttgart.de/rust/zynq7000-rs/src/branch/main/zynq7000) PAC
-  crate containing basic low-level register definition.
-- The [`zynq7000-hal`](https://egit.irs.uni-stuttgart.de/rust/zynq7000-rs/src/branch/main/zynq7000-hal)
+- The [`zynq7000`](https://egit.irs.uni-stuttgart.de/rust/zynq7000-rs/src/branch/main/zynq/zynq7000) PAC
+  crate containing basic low-level register definitions.
+- The [`zynq7000-mmu`](https://egit.irs.uni-stuttgart.de/rust/zynq7000-rs/src/branch/main/zynq/zynq7000-hal)
+  crate containing common MMU abstractions used by both the HAL and the run-time crate.
+- The [`zynq7000-hal`](https://egit.irs.uni-stuttgart.de/rust/zynq7000-rs/src/branch/main/zynq/zynq7000-hal)
   HAL crate containing higher-level abstractions on top of the PAC register crate.
-- The [`zynq7000-embassy`](https://egit.irs.uni-stuttgart.de/rust/zynq7000-rs/src/branch/main/zynq7000-embassy)
-  crate containing support for running the embassy-rs RTOS.
+- The [`zynq7000-embassy`](https://egit.irs.uni-stuttgart.de/rust/zynq7000-rs/src/branch/main/zynq/zynq7000-embassy)
+  crate containing support for running the embassy-rs asynchronous run-time.
+
+This project was developed using a Zedboard, so there are several crates available targeted towards
+this board:
+
+- The [`zedboard-bsp`](https://egit.irs.uni-stuttgart.de/rust/zynq7000-rs/src/branch/main/zynq/zedboard-bsp)
+  crate containing board specific components for the Zedboard.
+- The [`zedboard-fsbl`](https://egit.irs.uni-stuttgart.de/rust/zynq7000-rs/src/branch/main/zynq/zedboard-fsbl)
+  contains a simple first-stage bootloader application for the Zedboard.
+- The [`zedboard-qspi-flasher`](https://egit.irs.uni-stuttgart.de/rust/zynq7000-rs/src/branch/main/zynq/zedboard-qspi-flasher)
+  contains an application which is able to flash a boot binary from DDR to the QSPI.
 
 It also contains the following helper crates:
 
-- The [`examples`](https://egit.irs.uni-stuttgart.de/rust/zynq7000-rs/src/branch/main/examples)
+- The [`examples`](https://egit.irs.uni-stuttgart.de/rust/zynq7000-rs/src/branch/main/zynq/examples)
   folder contains various example applications crates using the HAL and the PAC.
   This folder also contains dedicated example applications using the
   [`embassy`](https://github.com/embassy-rs/embassy) native Rust RTOS.
 
-The [`zedboard-fpga-design`](https://egit.irs.uni-stuttgart.de/rust/zynq7000-rs/src/branch/main/zedboard-fpga-design)
-folder contains a sample FPGA design and block design which was used in
-some of the provided software examples. The project was created with Vivado version 2024.1.
-The folder contains a README with all the steps required to load this project from a TCL script.
+## Other libraries and tools
+
+- The [`zedboard-fpga-design`](https://egit.irs.uni-stuttgart.de/rust/zynq7000-rs/src/branch/main/zedboard-fpga-design)
+  folder contains a sample FPGA design and block design which was used in some of the provided software examples. The project was created with Vivado version 2024.1.
+  The folder contains a README with all the steps required to load this project from a TCL script.
+- The [`zynq7000-boot-image`](https://egit.irs.uni-stuttgart.de/rust/zynq7000-rs/src/branch/main/zynq7000-boot-image)
+  library contains generic helpers to interface with the AMD
+  [boot binary](https://docs.amd.com/r/en-US/ug1283-bootgen-user-guide).
+- The [`tools/zynq7000-ps7init-extract`](https://egit.irs.uni-stuttgart.de/rust/zynq7000-rs/src/branch/main/tools/zynq7000-ps7init-extract)
+  tool allows extracting configuration from the AMD generated `ps7init.tcl` file which contains
+  static configuration parameters for DDR initialization.
 
 # Using the `.cargo/config.toml` file
 
+This is mostly relevant for development directly inside this repostiory.
 Use the following command to have a starting `config.toml` file
 
 ```sh
-cp .cargo/def-config.toml .cargo/config.toml
+cp .cargo/config.toml.template .cargo/config.toml
 ```
 
 You then can adapt the `config.toml` to your needs. For example, you can configure runners