Add FPGA OpenSBI and U-Boot

overlay.nix

@@ -40,6 +40,62 @@ final: prev:
     ];
   });
 
+  uboot-fpga = prev.ubootQemuRiscv64Smode.override {
+    filesToInstall = [ "u-boot.bin" "u-boot-nodtb.bin" ];
+    extraConfig = ''
+      CONFIG_RISCV=y
+      CONFIG_RISCV_SMODE=y
+      CONFIG_SYS_MALLOC_LEN=0x800000
+      CONFIG_NR_DRAM_BANKS=1
+      CONFIG_HAS_CUSTOM_SYS_INIT_SP_ADDR=y
+      CONFIG_CUSTOM_SYS_INIT_SP_ADDR=0x80200000
+      CONFIG_ENV_SIZE=0x20000
+      CONFIG_SYS_LOAD_ADDR=0x80200000
+      CONFIG_ARCH_RV64I=y
+      CONFIG_FIT=y
+      CONFIG_DISTRO_DEFAULTS=y
+      CONFIG_DISPLAY_CPUINFO=y
+      CONFIG_DISPLAY_BOARDINFO=y
+      CONFIG_SYS_CBSIZE=256
+      CONFIG_SYS_PBSIZE=276
+      CONFIG_SYS_BOOTM_LEN=0x4000000
+      CONFIG_CMD_BOOTEFI_SELFTEST=y
+      CONFIG_CMD_NVEDIT_EFI=y
+      # CONFIG_CMD_MII is not set
+      CONFIG_SYS_RELOC_GD_ENV_ADDR=y
+      CONFIG_DM_MTD=y
+      CONFIG_FLASH_SHOW_PROGRESS=0
+      CONFIG_SYS_MAX_FLASH_BANKS=2
+      #CONFIG_TEXT_BASE=0x80000000
+      # -------------------------
+      CONFIG_RISCV_ISA_C=n
+      # CONFIG_OF_EMBED=n
+      # CONFIG_OF_SEPARATE=y
+      # CONFIG_OF_OMIT_DTB=y
+      CONFIG_REQUIRE_SERIAL_CONSOLE=n
+      CONFIG_SERIAL_SEARCH_ALL=y
+      CONFIG_OF_CONTROL=y
+      CONFIG_OF_BOARD=y
+      CONFIG_OF_HAS_PRIOR_STAGE=y
+      CONFIG_BLKMAP=y
+      CONFIG_CMD_BLKMAP=y
+      CONFIG_SBI_V01=y
+      CONFIG_DEBUG_UART=y
+      CONFIG_DEBUG_UART_ANNOUNCE=y
+      CONFIG_DEBUG_SBI_CONSOLE=y
+    '';
+  };
+
+  opensbi-fpga = prev.opensbi.overrideAttrs (old: {
+    makeFlags = old.makeFlags ++ [
+        # Build OpenSBI without compressed instructions
+        "PLATFORM_RISCV_ISA=rv64g"
+        "PLATFORM=fpga/openpiton"
+        # Check with: riscv64-unknown-elf-objdump -d -M no-aliases rotate
+        "FW_PAYLOAD_PATH=${final.uboot-fpga}/u-boot-nodtb.bin"
+    ];
+  });
+
   linuxPackagesCustom = prev.linuxPackagesFor (prev.linux.override {
     structuredExtraConfig = with prev.lib.kernel; {
       KEXEC = yes;