riscv: qemu: Switch to use binman to generate u-boot.itb

By utilizing the newly introduced BINMAN_STANDALONE_FDT option, along
with a new dedicated device tree source file for the QEMU virt target
used for binman only, we can now use binman to generate u-boot.itb.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

arch/riscv/cpu/generic/Kconfig

@@ -4,6 +4,7 @@
 
 config GENERIC_RISCV
 	bool
+	select BINMAN if SPL
 	select ARCH_EARLY_INIT_R
 	imply CPU
 	imply CPU_RISCV

arch/riscv/dts/Makefile

@@ -2,6 +2,7 @@
 
 dtb-$(CONFIG_TARGET_AX25_AE350) += ae350_32.dtb ae350_64.dtb
 dtb-$(CONFIG_TARGET_MICROCHIP_ICICLE) += microchip-mpfs-icicle-kit.dtb
+dtb-$(CONFIG_TARGET_QEMU_VIRT) += qemu-virt.dtb
 dtb-$(CONFIG_TARGET_SIFIVE_UNLEASHED) += hifive-unleashed-a00.dtb
 dtb-$(CONFIG_TARGET_SIPEED_MAIX) += k210-maix-bit.dtb
 

arch/riscv/dts/binman.dtsi

@@ -48,21 +48,29 @@
 					};
 				};
 
+#ifndef CONFIG_OF_PRIOR_STAGE
 				@fdt-SEQ {
 					description = "NAME";
 					type = "flat_dt";
 					compression = "none";
 				};
+#endif
 			};
 
 			configurations {
 				default = "conf-1";
 
+#ifndef CONFIG_OF_PRIOR_STAGE
 				@conf-SEQ {
+#else
+				conf-1 {
+#endif
 					description = "NAME";
 					firmware = "opensbi";
 					loadables = "uboot";
+#ifndef CONFIG_OF_PRIOR_STAGE
 					fdt = "fdt-SEQ";
+#endif
 				};
 			};
 		};

arch/riscv/dts/qemu-virt.dts

@@ -0,0 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2021, Bin Meng <bmeng.cn@gmail.com>
+ */
+
+/dts-v1/;
+
+#include "binman.dtsi"

configs/qemu-riscv32_spl_defconfig

@@ -2,11 +2,13 @@ CONFIG_RISCV=y
 CONFIG_NR_DRAM_BANKS=1
 CONFIG_ENV_SIZE=0x20000
 CONFIG_SPL=y
+CONFIG_DEFAULT_DEVICE_TREE="qemu-virt"
 CONFIG_TARGET_QEMU_VIRT=y
 CONFIG_RISCV_SMODE=y
 CONFIG_DISTRO_DEFAULTS=y
 CONFIG_FIT=y
 CONFIG_SPL_LOAD_FIT_ADDRESS=0x80200000
+# CONFIG_USE_SPL_FIT_GENERATOR is not set
 CONFIG_DISPLAY_CPUINFO=y
 CONFIG_DISPLAY_BOARDINFO=y
 # CONFIG_CMD_MII is not set

configs/qemu-riscv64_spl_defconfig

@@ -2,12 +2,14 @@ CONFIG_RISCV=y
 CONFIG_NR_DRAM_BANKS=1
 CONFIG_ENV_SIZE=0x20000
 CONFIG_SPL=y
+CONFIG_DEFAULT_DEVICE_TREE="qemu-virt"
 CONFIG_TARGET_QEMU_VIRT=y
 CONFIG_ARCH_RV64I=y
 CONFIG_RISCV_SMODE=y
 CONFIG_DISTRO_DEFAULTS=y
 CONFIG_FIT=y
 CONFIG_SPL_LOAD_FIT_ADDRESS=0x80200000
+# CONFIG_USE_SPL_FIT_GENERATOR is not set
 CONFIG_DISPLAY_CPUINFO=y
 CONFIG_DISPLAY_BOARDINFO=y
 # CONFIG_CMD_MII is not set