Merge https://gitlab.denx.de/u-boot/custodians/u-boot-riscv

- Adds few DT related fixes required for Linux EFI stub to work on
  RISC-V.
- Makes SBI v0.2 the default SBI version to work with OpenSBI v0.7.
- Revert "riscv: qemu: clear kernel-start/-end in device tree as
  workaround for BBL"
- Remove unnecessary CONFIG_IS_ENABLED().

17 files changed, 211 insertions, 86 deletions

diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
index 3061bf8..fb5fe5a 100644
--- a/arch/riscv/Kconfig
+++ b/arch/riscv/Kconfig
@@ -193,6 +193,7 @@ config SYS_MALLOC_F_LEN
 
 config SMP
 	bool "Symmetric Multi-Processing"
+	depends on SBI_V01 || !RISCV_SMODE
 	help
 	  This enables support for systems with more than one CPU. If
 	  you say N here, U-Boot will run on single and multiprocessor
@@ -200,10 +201,21 @@ config SMP
 	  machine. If you say Y here, U-Boot will run on many, but not
 	  all, single processor machines.
 
+config SPL_SMP
+	bool "Symmetric Multi-Processing in SPL"
+	depends on SPL && SPL_RISCV_MMODE
+	default y
+	help
+	  This enables support for systems with more than one CPU in SPL.
+	  If you say N here, U-Boot SPL will run on single and multiprocessor
+	  machines, but will use only one CPU of a multiprocessor
+	  machine. If you say Y here, U-Boot SPL will run on many, but not
+	  all, single processor machines.
+
 config NR_CPUS
 	int "Maximum number of CPUs (2-32)"
 	range 2 32
-	depends on SMP
+	depends on SMP || SPL_SMP
 	default 8
 	help
 	  On multiprocessor machines, U-Boot sets up a stack for each CPU.
@@ -214,14 +226,32 @@ config SBI
 	bool
 	default y if RISCV_SMODE || SPL_RISCV_SMODE
 
+choice
+	prompt "SBI support"
+	default SBI_V02
+
 config SBI_V01
 	bool "SBI v0.1 support"
-	default y
 	depends on SBI
 	help
 	  This config allows kernel to use SBI v0.1 APIs. This will be
 	  deprecated in future once legacy M-mode software are no longer in use.
 
+config SBI_V02
+	bool "SBI v0.2 support"
+	depends on SBI
+	help
+	  This config allows kernel to use SBI v0.2 APIs. SBI v0.2 is more
+	  scalable and extendable to handle future needs for RISC-V supervisor
+	  interfaces. For example, with SBI v0.2 HSM extension, only a single
+	  hart need to boot and enter operating system. The booting hart can
+	  bring up secondary harts one by one afterwards.
+
+	  Choose this option if OpenSBI v0.7 or above release is used together
+	  with U-Boot.
+
+endchoice
+
 config SBI_IPI
 	bool
 	depends on SBI
diff --git a/arch/riscv/cpu/ax25/cache.c b/arch/riscv/cpu/ax25/cache.c
index 9f42419..9df629d 100644
--- a/arch/riscv/cpu/ax25/cache.c
+++ b/arch/riscv/cpu/ax25/cache.c
@@ -12,7 +12,7 @@
 #include <asm/csr.h>
 
 #ifdef CONFIG_RISCV_NDS_CACHE
-#if CONFIG_IS_ENABLED(RISCV_MMODE) || CONFIG_IS_ENABLED(SPL_RISCV_MMODE)
+#if CONFIG_IS_ENABLED(RISCV_MMODE)
 /* mcctlcommand */
 #define CCTL_REG_MCCTLCOMMAND_NUM	0x7cc
 
@@ -47,7 +47,7 @@ void flush_dcache_all(void)
 {
 #if !CONFIG_IS_ENABLED(SYS_ICACHE_OFF)
 #ifdef CONFIG_RISCV_NDS_CACHE
-#if CONFIG_IS_ENABLED(RISCV_MMODE) || CONFIG_IS_ENABLED(SPL_RISCV_MMODE)
+#if CONFIG_IS_ENABLED(RISCV_MMODE)
 	csr_write(CCTL_REG_MCCTLCOMMAND_NUM, CCTL_L1D_WBINVAL_ALL);
 #endif
 #endif
@@ -68,7 +68,7 @@ void icache_enable(void)
 {
 #if !CONFIG_IS_ENABLED(SYS_ICACHE_OFF)
 #ifdef CONFIG_RISCV_NDS_CACHE
-#if CONFIG_IS_ENABLED(RISCV_MMODE) || CONFIG_IS_ENABLED(SPL_RISCV_MMODE)
+#if CONFIG_IS_ENABLED(RISCV_MMODE)
 	asm volatile (
 		"csrr t1, mcache_ctl\n\t"
 		"ori t0, t1, 0x1\n\t"
@@ -83,7 +83,7 @@ void icache_disable(void)
 {
 #if !CONFIG_IS_ENABLED(SYS_ICACHE_OFF)
 #ifdef CONFIG_RISCV_NDS_CACHE
-#if CONFIG_IS_ENABLED(RISCV_MMODE) || CONFIG_IS_ENABLED(SPL_RISCV_MMODE)
+#if CONFIG_IS_ENABLED(RISCV_MMODE)
 	asm volatile (
 		"fence.i\n\t"
 		"csrr t1, mcache_ctl\n\t"
@@ -99,7 +99,7 @@ void dcache_enable(void)
 {
 #if !CONFIG_IS_ENABLED(SYS_DCACHE_OFF)
 #ifdef CONFIG_RISCV_NDS_CACHE
-#if CONFIG_IS_ENABLED(RISCV_MMODE) || CONFIG_IS_ENABLED(SPL_RISCV_MMODE)
+#if CONFIG_IS_ENABLED(RISCV_MMODE)
 	asm volatile (
 		"csrr t1, mcache_ctl\n\t"
 		"ori t0, t1, 0x2\n\t"
@@ -117,7 +117,7 @@ void dcache_disable(void)
 {
 #if !CONFIG_IS_ENABLED(SYS_DCACHE_OFF)
 #ifdef CONFIG_RISCV_NDS_CACHE
-#if CONFIG_IS_ENABLED(RISCV_MMODE) || CONFIG_IS_ENABLED(SPL_RISCV_MMODE)
+#if CONFIG_IS_ENABLED(RISCV_MMODE)
 	csr_write(CCTL_REG_MCCTLCOMMAND_NUM, CCTL_L1D_WBINVAL_ALL);
 	asm volatile (
 		"csrr t1, mcache_ctl\n\t"
@@ -137,7 +137,7 @@ int icache_status(void)
 	int ret = 0;
 
 #ifdef CONFIG_RISCV_NDS_CACHE
-#if CONFIG_IS_ENABLED(RISCV_MMODE) || CONFIG_IS_ENABLED(SPL_RISCV_MMODE)
+#if CONFIG_IS_ENABLED(RISCV_MMODE)
 	asm volatile (
 		"csrr t1, mcache_ctl\n\t"
 		"andi	%0, t1, 0x01\n\t"
@@ -156,7 +156,7 @@ int dcache_status(void)
 	int ret = 0;
 
 #ifdef CONFIG_RISCV_NDS_CACHE
-#if CONFIG_IS_ENABLED(RISCV_MMODE) || CONFIG_IS_ENABLED(SPL_RISCV_MMODE)
+#if CONFIG_IS_ENABLED(RISCV_MMODE)
 	asm volatile (
 		"csrr t1, mcache_ctl\n\t"
 		"andi	%0, t1, 0x02\n\t"
diff --git a/arch/riscv/cpu/generic/cpu.c b/arch/riscv/cpu/generic/cpu.c
index c0a5288..13a69ef 100644
--- a/arch/riscv/cpu/generic/cpu.c
+++ b/arch/riscv/cpu/generic/cpu.c
@@ -4,7 +4,6 @@
  */
 
 #include <common.h>
-#include <dm.h>
 #include <irq_func.h>
 
 /*
@@ -21,16 +20,3 @@ int cleanup_before_linux(void)
 
 	return 0;
 }
-
-/* To enumerate devices on the /soc/ node, create a "simple-bus" driver */
-static const struct udevice_id riscv_virtio_soc_ids[] = {
-	{ .compatible = "riscv-virtio-soc" },
-	{ }
-};
-
-U_BOOT_DRIVER(riscv_virtio_soc) = {
-	.name = "riscv_virtio_soc",
-	.id = UCLASS_SIMPLE_BUS,
-	.of_match = riscv_virtio_soc_ids,
-	.flags = DM_FLAG_PRE_RELOC,
-};
diff --git a/arch/riscv/cpu/start.S b/arch/riscv/cpu/start.S
index 6b3ff99..5f1c220 100644
--- a/arch/riscv/cpu/start.S
+++ b/arch/riscv/cpu/start.S
@@ -53,14 +53,12 @@ _start:
 	/* mask all interrupts */
 	csrw	MODE_PREFIX(ie), zero
 
-#ifdef CONFIG_SMP
+#if CONFIG_IS_ENABLED(SMP)
 	/* check if hart is within range */
 	/* tp: hart id */
 	li	t0, CONFIG_NR_CPUS
 	bge	tp, t0, hart_out_of_bounds_loop
-#endif
 
-#ifdef CONFIG_SMP
 	/* set xSIE bit to receive IPIs */
 #if CONFIG_IS_ENABLED(RISCV_MMODE)
 	li	t0, MIE_MSIE
@@ -93,7 +91,7 @@ call_board_init_f_0:
 	mv	gp, a0
 
 	/* setup stack */
-#ifdef CONFIG_SMP
+#if CONFIG_IS_ENABLED(SMP)
 	/* tp: hart id */
 	slli	t0, tp, CONFIG_STACK_SIZE_SHIFT
 	sub	sp, a0, t0
@@ -121,6 +119,7 @@ call_board_init_f_0:
 
 	jal	board_init_f_init_reserve
 
+	SREG	s1, GD_FIRMWARE_FDT_ADDR(gp)
 	/* save the boot hart id to global_data */
 	SREG	tp, GD_BOOT_HART(gp)
 
@@ -184,7 +183,7 @@ spl_stack_gd_setup:
 	mv	s0, a0
 
 	/* setup stack on main hart */
-#ifdef CONFIG_SMP
+#if CONFIG_IS_ENABLED(SMP)
 	/* tp: hart id */
 	slli	t0, tp, CONFIG_STACK_SIZE_SHIFT
 	sub	sp, s0, t0
@@ -233,7 +232,7 @@ relocate_code:
  *Set up the stack
  */
 stack_setup:
-#ifdef CONFIG_SMP
+#if CONFIG_IS_ENABLED(SMP)
 	/* tp: hart id */
 	slli	t0, tp, CONFIG_STACK_SIZE_SHIFT
 	sub	sp, s2, t0
@@ -328,7 +327,7 @@ clbss_l:
 	blt	t0, t1, clbss_l
 
 relocate_secondary_harts:
-#ifdef CONFIG_SMP
+#if CONFIG_IS_ENABLED(SMP)
 	/* send relocation IPI */
 	la	t0, secondary_hart_relocate
 	add	a0, t0, t6
@@ -372,14 +371,12 @@ call_board_init_r:
  */
 	jr	t4			/* jump to board_init_r() */
 
-#ifdef CONFIG_SMP
+#if CONFIG_IS_ENABLED(SMP)
 hart_out_of_bounds_loop:
 	/* Harts in this loop are out of bounds, increase CONFIG_NR_CPUS. */
 	wfi
 	j	hart_out_of_bounds_loop
-#endif
 
-#ifdef CONFIG_SMP
 /* SMP relocation entry */
 secondary_hart_relocate:
 	/* a1: new sp */
@@ -397,7 +394,7 @@ secondary_hart_relocate:
 secondary_hart_loop:
 	wfi
 
-#ifdef CONFIG_SMP
+#if CONFIG_IS_ENABLED(SMP)
 	csrr	t0, MODE_PREFIX(ip)
 #if CONFIG_IS_ENABLED(RISCV_MMODE)
 	andi	t0, t0, MIE_MSIE
diff --git a/arch/riscv/include/asm/global_data.h b/arch/riscv/include/asm/global_data.h
index b74bd7e..6c50149 100644
--- a/arch/riscv/include/asm/global_data.h
+++ b/arch/riscv/include/asm/global_data.h
@@ -15,6 +15,7 @@
 /* Architecture-specific global data */
 struct arch_global_data {
 	long boot_hart;		/* boot hart id */
+	phys_addr_t firmware_fdt_addr;
 #ifdef CONFIG_SIFIVE_CLINT
 	void __iomem *clint;	/* clint base address */
 #endif
@@ -24,7 +25,7 @@ struct arch_global_data {
 #ifdef CONFIG_ANDES_PLMT
 	void __iomem *plmt;	/* plmt base address */
 #endif
-#ifdef CONFIG_SMP
+#if CONFIG_IS_ENABLED(SMP)
 	struct ipi_data ipi[CONFIG_NR_CPUS];
 #endif
 #ifndef CONFIG_XIP
diff --git a/arch/riscv/include/asm/u-boot-riscv.h b/arch/riscv/include/asm/u-boot-riscv.h
index 49febd5..543a168 100644
--- a/arch/riscv/include/asm/u-boot-riscv.h
+++ b/arch/riscv/include/asm/u-boot-riscv.h
@@ -17,5 +17,7 @@ int cleanup_before_linux(void);
 /* board/.../... */
 int board_init(void);
 void board_quiesce_devices(void);
+int riscv_board_reserved_mem_fixup(void *fdt);
+int riscv_fdt_copy_resv_mem_node(const void *src_fdt, void *dest_fdt);
 
 #endif	/* _U_BOOT_RISCV_H_ */
diff --git a/arch/riscv/lib/Makefile b/arch/riscv/lib/Makefile
index adadbf4..b5e9324 100644
--- a/arch/riscv/lib/Makefile
+++ b/arch/riscv/lib/Makefile
@@ -22,8 +22,9 @@ endif
 obj-y	+= interrupts.o
 obj-y	+= reset.o
 obj-y   += setjmp.o
-obj-$(CONFIG_SMP) += smp.o
+obj-$(CONFIG_$(SPL_)SMP) += smp.o
 obj-$(CONFIG_SPL_BUILD)	+= spl.o
+obj-y   += fdt_fixup.o
 
 # For building EFI apps
 CFLAGS_$(EFI_CRT0) := $(CFLAGS_EFI)
diff --git a/arch/riscv/lib/asm-offsets.c b/arch/riscv/lib/asm-offsets.c
index 4fa4fd3..7301c1b 100644
--- a/arch/riscv/lib/asm-offsets.c
+++ b/arch/riscv/lib/asm-offsets.c
@@ -14,6 +14,7 @@
 int main(void)
 {
 	DEFINE(GD_BOOT_HART, offsetof(gd_t, arch.boot_hart));
+	DEFINE(GD_FIRMWARE_FDT_ADDR, offsetof(gd_t, arch.firmware_fdt_addr));
 #ifndef CONFIG_XIP
 	DEFINE(GD_AVAILABLE_HARTS, offsetof(gd_t, arch.available_harts));
 #endif
diff --git a/arch/riscv/lib/bootm.c b/arch/riscv/lib/bootm.c
index fad1690..0d06095 100644
--- a/arch/riscv/lib/bootm.c
+++ b/arch/riscv/lib/bootm.c
@@ -26,11 +26,6 @@ __weak void board_quiesce_devices(void)
 {
 }
 
-int arch_fixup_fdt(void *blob)
-{
-	return 0;
-}
-
 /**
  * announce_and_cleanup() - Print message and prepare for kernel boot
  *
diff --git a/arch/riscv/lib/fdt_fixup.c b/arch/riscv/lib/fdt_fixup.c
new file mode 100644
index 0000000..20e0759
--- /dev/null
+++ b/arch/riscv/lib/fdt_fixup.c
@@ -0,0 +1,150 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (c) 2020 Western Digital Corporation or its affiliates
+ *
+ */
+
+#include <common.h>
+#include <fdt_support.h>
+#include <mapmem.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+/**
+ * riscv_fdt_copy_resv_mem_node() - Copy reserve memory node entry
+ * @src: Pointer to the source device tree from which reserved memory node
+ *	 needs to be copied.
+ * @dst: Pointer to the destination device tree to which reserved memory node
+ *	 needs to be copied.
+ *
+ * Return: 0 on success or if source doesn't have reserved memory node.
+ *	   Error if copy process failed.
+ */
+int riscv_fdt_copy_resv_mem_node(const void *src, void *dst)
+{
+	u32 phandle;
+	struct fdt_memory pmp_mem;
+	fdt_addr_t addr;
+	fdt_size_t size;
+	int offset, node, err, rmem_offset;
+	bool nomap = true;
+	char basename[32] = {0};
+	int bname_len;
+	int max_len = sizeof(basename);
+	const char *name;
+	char *temp;
+
+	offset = fdt_path_offset(src, "/reserved-memory");
+	if (offset < 0) {
+		printf("No reserved memory region found in source FDT\n");
+		return 0;
+	}
+
+	fdt_for_each_subnode(node, src, offset) {
+		name = fdt_get_name(src, node, NULL);
+
+		addr = fdtdec_get_addr_size_auto_noparent(src, node,
+							  "reg", 0, &size,
+							  false);
+		if (addr == FDT_ADDR_T_NONE) {
+			debug("failed to read address/size for %s\n", name);
+			continue;
+		}
+		strncpy(basename, name, max_len);
+		temp = strchr(basename, '@');
+		if (temp) {
+			bname_len = strnlen(basename, max_len) - strnlen(temp,
+								       max_len);
+			*(basename + bname_len) = '\0';
+		}
+		pmp_mem.start = addr;
+		pmp_mem.end = addr + size - 1;
+		err = fdtdec_add_reserved_memory(dst, basename, &pmp_mem,
+						 &phandle);
+		if (err < 0) {
+			printf("failed to add reserved memory: %d\n", err);
+			return err;
+		}
+		if (!fdt_getprop(src, node, "no-map", NULL))
+			nomap = false;
+		if (nomap) {
+			rmem_offset = fdt_node_offset_by_phandle(dst, phandle);
+			fdt_setprop_empty(dst, rmem_offset, "no-map");
+		}
+	}
+
+	return 0;
+}
+
+/**
+ * riscv_board_reserved_mem_fixup() - Fix up reserved memory node for a board
+ * @fdt: Pointer to the device tree in which reserved memory node needs to be
+ *	 added.
+ *
+ * In RISC-V, any board compiled with OF_SEPARATE needs to copy the reserved
+ * memory node from the device tree provided by the firmware to the device tree
+ * used by U-Boot. This is a common function that individual board fixup
+ * functions can invoke.
+ *
+ * Return: 0 on success or error otherwise.
+ */
+int riscv_board_reserved_mem_fixup(void *fdt)
+{
+	int err;
+	void *src_fdt_addr;
+
+	src_fdt_addr = map_sysmem(gd->arch.firmware_fdt_addr, 0);
+	err = riscv_fdt_copy_resv_mem_node(src_fdt_addr, fdt);
+	if (err < 0)
+		return err;
+
+	return 0;
+}
+
+#ifdef CONFIG_OF_BOARD_FIXUP
+int board_fix_fdt(void *fdt)
+{
+	int err;
+
+	err = riscv_board_reserved_mem_fixup(fdt);
+	if (err < 0) {
+		printf("failed to fixup DT for reserved memory: %d\n", err);
+		return err;
+	}
+
+	return 0;
+}
+#endif
+
+int arch_fixup_fdt(void *blob)
+{
+	int err;
+#ifdef CONFIG_EFI_LOADER
+	u32 size;
+	int chosen_offset;
+
+	size = fdt_totalsize(blob);
+	err  = fdt_open_into(blob, blob, size + 32);
+	if (err < 0) {
+		printf("Device Tree can't be expanded to accommodate new node");
+		return err;
+	}
+	chosen_offset = fdt_path_offset(blob, "/chosen");
+	if (chosen_offset < 0) {
+		err = fdt_add_subnode(blob, 0, "chosen");
+		if (err < 0) {
+			printf("chosen node can not be added\n");
+			return err;
+		}
+	}
+	/* Overwrite the boot-hartid as U-Boot is the last stage BL */
+	fdt_setprop_u32(blob, chosen_offset, "boot-hartid", gd->arch.boot_hart);
+#endif
+
+	/* Copy the reserved-memory node to the DT used by OS */
+	err = riscv_fdt_copy_resv_mem_node(gd->fdt_blob, blob);
+	if (err < 0)
+		return err;
+
+	return 0;
+}
diff --git a/arch/riscv/lib/spl.c b/arch/riscv/lib/spl.c
index ae07bbe..4ca038b 100644
--- a/arch/riscv/lib/spl.c
+++ b/arch/riscv/lib/spl.c
@@ -41,7 +41,7 @@ void __noreturn jump_to_image_no_args(struct spl_image_info *spl_image)
 	invalidate_icache_all();
 
 	debug("image entry point: 0x%lX\n", spl_image->entry_point);
-#ifdef CONFIG_SMP
+#ifdef CONFIG_SPL_SMP
 	ret = smp_call_function(spl_image->entry_point, (ulong)fdt_blob, 0, 0);
 	if (ret)
 		hang();
diff --git a/board/emulation/qemu-riscv/Kconfig b/board/emulation/qemu-riscv/Kconfig
index 7ce1201..ad99b08 100644
--- a/board/emulation/qemu-riscv/Kconfig
+++ b/board/emulation/qemu-riscv/Kconfig
@@ -43,7 +43,6 @@ config BOARD_SPECIFIC_OPTIONS # dummy
 	imply CMD_EXT4
 	imply CMD_FAT
 	imply BOARD_LATE_INIT
-	imply OF_BOARD_SETUP
 	imply SIFIVE_SERIAL
 	imply SMP
 	imply PCI
diff --git a/board/emulation/qemu-riscv/qemu-riscv.c b/board/emulation/qemu-riscv/qemu-riscv.c
index cbce5ff..c3f9698 100644
--- a/board/emulation/qemu-riscv/qemu-riscv.c
+++ b/board/emulation/qemu-riscv/qemu-riscv.c
@@ -52,45 +52,6 @@ int board_late_init(void)
 	return 0;
 }
 
-/*
- * QEMU specifies the location of Linux (supplied with the -kernel argument)
- * in the device tree using the riscv,kernel-start and riscv,kernel-end
- * properties. We currently rely on the SBI implementation of BBL to run
- * Linux and therefore embed Linux as payload in BBL. This causes an issue,
- * because BBL detects the kernel properties in the device tree and ignores
- * the Linux payload as a result. To work around this issue, we clear the
- * kernel properties before booting Linux.
- *
- * This workaround can be removed, once we do not require BBL for its SBI
- * implementation anymore.
- */
-int ft_board_setup(void *blob, bd_t *bd)
-{
-	int chosen_offset, ret;
-
-	chosen_offset = fdt_path_offset(blob, "/chosen");
-	if (chosen_offset < 0)
-		return 0;
-
-#ifdef CONFIG_ARCH_RV64I
-	ret = fdt_setprop_u64(blob, chosen_offset, "riscv,kernel-start", 0);
-#else
-	ret = fdt_setprop_u32(blob, chosen_offset, "riscv,kernel-start", 0);
-#endif
-	if (ret)
-		return ret;
-
-#ifdef CONFIG_ARCH_RV64I
-	ret = fdt_setprop_u64(blob, chosen_offset, "riscv,kernel-end", 0);
-#else
-	ret = fdt_setprop_u32(blob, chosen_offset, "riscv,kernel-end", 0);
-#endif
-	if (ret)
-		return ret;
-
-	return 0;
-}
-
 #ifdef CONFIG_SPL
 u32 spl_boot_device(void)
 {
diff --git a/common/spl/spl_opensbi.c b/common/spl/spl_opensbi.c
index a136073..3519c34 100644
--- a/common/spl/spl_opensbi.c
+++ b/common/spl/spl_opensbi.c
@@ -76,7 +76,7 @@ void spl_invoke_opensbi(struct spl_image_info *spl_image)
 	opensbi_entry = (void (*)(ulong, ulong, ulong))spl_image->entry_point;
 	invalidate_icache_all();
 
-#ifdef CONFIG_SMP
+#ifdef CONFIG_SPL_SMP
 	/*
 	 * Start OpenSBI on all secondary harts and wait for acknowledgment.
 	 *
diff --git a/configs/sifive_fu540_defconfig b/configs/sifive_fu540_defconfig
index 6d61e6c..f805aac 100644
--- a/configs/sifive_fu540_defconfig
+++ b/configs/sifive_fu540_defconfig
@@ -9,6 +9,7 @@ CONFIG_FIT=y
 CONFIG_MISC_INIT_R=y
 CONFIG_DISPLAY_CPUINFO=y
 CONFIG_DISPLAY_BOARDINFO=y
+CONFIG_OF_BOARD_FIXUP=y
 CONFIG_DEFAULT_DEVICE_TREE="hifive-unleashed-a00"
 CONFIG_SYS_RELOC_GD_ENV_ADDR=y
 CONFIG_DM_MTD=y
diff --git a/doc/board/emulation/qemu-riscv.rst b/doc/board/emulation/qemu-riscv.rst
index fe7505e..c390006 100644
--- a/doc/board/emulation/qemu-riscv.rst
+++ b/doc/board/emulation/qemu-riscv.rst
@@ -56,7 +56,7 @@ For instructions on how to run U-Boot in supervisor mode on QEMU
 with OpenSBI, see the documentation available with OpenSBI:
 https://github.com/riscv/opensbi/blob/master/docs/platform/qemu_virt.md
 
-These have been tested in QEMU 3.0.0.
+These have been tested in QEMU 4.2.0.
 
 Running U-Boot SPL
 ------------------
diff --git a/lib/fdtdec.c b/lib/fdtdec.c
index 9ecfa2a..460f0d2 100644
--- a/lib/fdtdec.c
+++ b/lib/fdtdec.c
@@ -1311,7 +1311,8 @@ int fdtdec_add_reserved_memory(void *blob, const char *basename,
 			continue;
 		}
 
-		if (addr == carveout->start && (addr + size) == carveout->end) {
+		if (addr == carveout->start && (addr + size - 1) ==
+						carveout->end) {
 			if (phandlep)
 				*phandlep = fdt_get_phandle(blob, node);
 			return 0;