Add Star64 as supported platform

Signed-off-by: Ivan-Velickovic <[email protected]>

Author: Ivan-Velickovic

Hardware/Star64/dip_switch.png

@@ -0,0 +1,205 @@
+---
+riscv_hardware: true
+cmake_plat: star64
+xcompiler_arg: -DRISCV64=1 -DUseRiscVOpenSBI=OFF
+platform: Star64
+arch: RV64GBC, RV64IMAC, RV32IMAFBC
+virtualization: "No"
+iommu: "No"
+simulation_target: false
+Status: "Unverified"
+Contrib: "Community"
+Maintained: "seL4 Foundation"
+soc: StarFive JH7110
+cpu:  U74-MC, E24
+SPDX-License-Identifier: CC-BY-SA-4.0
+SPDX-FileCopyrightText: 2020 seL4 Project a Series of LF Projects, LLC.
+---
+
+# Star64
+
+The Star64 is a RISC-V SBC by Pine64 based on the StarFive JH7110 SoC. Check
+[here](https://wiki.pine64.org/wiki/STAR64) for details.
+
+The StarFive JH7110 SoC is comprised of the SiFive U74-MC (four 64-bit U74
+cores and one 64-bit S7 core) and one SiFive E24 32-bit core. Note that by
+default seL4 is setup to use the U74 cores as neither the S7 or E24 core has
+S-Mode, which seL4 requires.
+
+The Star64 arrives with the following boot process from the SPI flash:
+    1. U-Boot SPL starts
+    2. OpenSBI starts
+    3. U-Boot proper starts
+
+## Building the GCC toolchain
+
+{% include risc-v.md %}
+
+## Building seL4test
+
+{% include sel4test.md %}
+
+## Booting via microSD card
+
+```
+fatload mmc 1 0x60000000 sel4test-driver-image-riscv-star64
+go 0x60000000
+```
+
+## Booting via TFTP
+
+If you have setup a TFTP server, enter the following commands on the U-Boot console
+to load an image via the network.
+
+```
+dhcp
+tftpboot 0x60000000 <YOUR_TFTP_SERVER_IP_ADDRESS>:sel4test-driver-image-riscv-star64
+go 0x60000000
+```
+
+## Producing a SD card bootable image
+
+If you require a custom U-Boot or have other constraints, you may need to create
+your own bootable image. The following instructions show how to make a bootable
+image for a microSD card that can then be inserted into the Star64. Note that you
+will need to change the booting mode via the DIP switch, like so:
+
+![Star64 DIP switch when booting via microSD card](dip_switch.png)
+
+The boot process of this bootable image is the same as the SPI flash booting
+process. Unfortunately, at the time of writing, U-Boot does not support booting
+in M-Mode which means U-Boot must be loaded by an SBI in S-Mode.
+
+### Acquring sources
+
+At the time of writing, mainline U-Boot does not support the Pine64 Star64, hence
+if you want to built it yourself, there is a patch to apply available on a fork of
+U-Boot. Note that these instructions are reproduced from [here](https://github.com/Ivan-Velickovic/star64_sdcard).
+
+```sh
+git clone https://github.com/Fishwaldo/u-boot.git --branch star64
+git clone https://github.com/riscv/opensbi.git
+git clone https://github.com/starfive-tech/soft_3rdpart.git
+```
+
+### Compiling U-Boot and U-Boot SPL
+
+```sh
+CROSS_COMPILE=<RISCV_TOOLCHAIN> make -C u-boot pine64_star64_defconfig
+CROSS_COMPILE=<RISCV_TOOLCHAIN> make -C u-boot
+```
+
+### Compiling OpenSBI
+
+Now that we have U-Boot, we can make the OpenSBI image that contains U-Boot as the
+payload.
+
+```sh
+mkdir -p opensbi_build
+make -C $OPENSBI PLATFORM=generic \
+                    CROSS_COMPILE=<RISCV_TOOLCHAIN> \
+                    FW_FDT_PATH=u-boot/arch/riscv/dts/pine64_star64.dtb \
+                    FW_PAYLOAD_PATH=u-boot/u-boot.bin \
+                    PLATFORM_RISCV_XLEN=64 \
+                    PLATFORM_RISCV_ISA=rv64imafdc \
+                    PLATFORM_RISCV_ABI=lp64d \
+                    O=opensbi_build \
+                    FW_TEXT_START=0x40000000 \
+```
+
+Now we need to take the payload and turn it into a Flattened uImage Tree (FIT) for U-Boot SPL
+to load.
+
+First we'll need an ITS file to describe the FIT:
+```sh
+/dts-v1/;
+
+/ {
+    description = "U-boot-spl FIT image for JH7110 Pine64 Star64";
+    #address-cells = <2>;
+
+    images {
+        firmware {
+            description = "u-boot";
+            data = /incbin/("build/opensbi/platform/generic/firmware/fw_payload.bin");
+            type = "firmware";
+            arch = "riscv";
+            os = "u-boot";
+            load = <0x0 0x40000000>;
+            entry = <0x0 0x40000000>;
+            compression = "none";
+        };
+    };
+
+    configurations {
+        default = "config-1";
+
+        config-1 {
+            description = "U-boot-spl FIT config for JH7110 Pine64 Star64";
+            firmware = "firmware";
+        };
+    };
+};
+```
+
+Now, invoke the `mkimage` tool to generate the FIT.
+```sh
+mkimage -f <ITS_FILE> -A riscv -O u-boot -T firmware opensbi_uboot_fit.img
+```
+
+### Add SPL header to U-Boot SPL binary
+
+```sh
+cd soft_3rdpart/spl_tool
+make
+```
+
+Now that the SPL tool that adds the header is compiled, we can invoke it on the
+U-Boot SPL image:
+```sh
+spl_tool -c -f u-boot/spl/u-boot-spl.bin
+```
+
+### Generate bootable image
+
+Lastly, we need to create the bootable image from all of these binaries. For this
+the `genimage` tool is used.
+
+First, we'll need the configuration file. Note that you will have to change the
+paths to match where you build each binary.
+```
+image sdcard.img {
+    hdimage {
+        gpt = true
+    }
+
+    partition spl {
+        image = "/path/to/u-boot-spl.bin.normal.out"
+        partition-type-uuid = 2E54B353-1271-4842-806F-E436D6AF6985
+        offset = 2M
+        size = 2M
+    }
+
+    partition uboot {
+        image = "/path/to/opensbi_uboot_fit.img"
+        partition-type-uuid = 5B193300-FC78-40CD-8002-E86C45580B47
+        offset = 4M
+        size = 4M
+    }
+}
+```
+
+Now we can pass this configuration, a temporary directory path, and a root
+directory path to the genimage tool.
+```sh
+# genimage expects these directories to exist before invoking it
+mkdir -p temp
+mkdir -p root
+# <INPUT_PATH> represents the top dir from where the genimage tool looks for
+# the image paths in the configuration file
+genimage --config <GENIMAGE_CONFIG> --inputpath <INPUT_PATH> --tmppath temp
+```
+
+The final image will be `images/sdcard.img`. You can either use the `dd` utility
+or the [balenaEtcher](https://www.balena.io/etcher) program to write the image to
+your microSD card.