diff --git a/arch/Kconfig b/arch/Kconfig
index 6258788f53..bb2e7bedd1 100644
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -37,6 +37,14 @@ config 32BIT
 
 config 64BIT
 	bool
+	help
+	  Indicates that U-Boot proper will be built for a 64 bit
+	  architecture.
+
+config SPL_64BIT
+	bool
+	help
+	  Indicates that SPL will be built for a 64 bit architecture.
 
 config SYS_CACHELINE_SIZE
 	int
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 7282c4123b..055762b0b9 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -7,6 +7,7 @@ config SYS_ARCH
 config ARM64
 	bool
 	select 64BIT
+	select SPL_64BIT if SPL
 	select PHYS_64BIT
 	select SYS_CACHE_SHIFT_6
 	imply SPL_SEPARATE_BSS
diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index 38577af43d..7ea439e857 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -211,6 +211,7 @@ config CPU_MIPS64_R1
 	bool "MIPS64 Release 1"
 	depends on SUPPORTS_CPU_MIPS64_R1
 	select 64BIT
+	select SPL_64BIT if SPL
 	help
 	  Choose this option to build a kernel for release 1 through 5 of the
 	  MIPS64 architecture.
@@ -219,6 +220,7 @@ config CPU_MIPS64_R2
 	bool "MIPS64 Release 2"
 	depends on SUPPORTS_CPU_MIPS64_R2
 	select 64BIT
+	select SPL_64BIT if SPL
 	help
 	  Choose this option to build a kernel for release 2 through 5 of the
 	  MIPS64 architecture.
@@ -227,6 +229,7 @@ config CPU_MIPS64_R6
 	bool "MIPS64 Release 6"
 	depends on SUPPORTS_CPU_MIPS64_R6
 	select 64BIT
+	select SPL_64BIT if SPL
 	help
 	  Choose this option to build a kernel for release 6 or later of the
 	  MIPS64 architecture.
@@ -235,6 +238,7 @@ config CPU_MIPS64_OCTEON
 	bool "Marvell Octeon series of CPUs"
 	depends on SUPPORTS_CPU_MIPS64_OCTEON
 	select 64BIT
+	select SPL_64BIT if SPL
 	help
 	 Choose this option for Marvell Octeon CPUs.  These CPUs are between
 	 MIPS64 R5 and R6 with other extensions.
diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
index 043d963f63..abb7a984c4 100644
--- a/arch/riscv/Kconfig
+++ b/arch/riscv/Kconfig
@@ -120,6 +120,7 @@ config ARCH_RV32I
 config ARCH_RV64I
 	bool "RV64I"
 	select 64BIT
+	select SPL_64BIT if SPL
 	select PHYS_64BIT
 	help
 	  Choose this option to target the RV64I base integer instruction set.
diff --git a/arch/sandbox/Kconfig b/arch/sandbox/Kconfig
index db29ca14bd..4c169034d9 100644
--- a/arch/sandbox/Kconfig
+++ b/arch/sandbox/Kconfig
@@ -47,6 +47,7 @@ config HOST_32BIT
 config HOST_64BIT
 	def_bool $(cc-define,_LP64)
 	select 64BIT
+	select SPL_64BIT if SPL
 
 config HOST_HAS_SDL
 	def_bool $(success,sdl2-config --version)
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 23a1e21b29..006a59d6fa 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -44,6 +44,7 @@ endchoice
 
 config X86_64
 	bool
+	select 64BIT
 
 config SPL_X86_64
 	bool
diff --git a/common/bloblist.c b/common/bloblist.c
index ec6ff7a5a9..110bb9dc44 100644
--- a/common/bloblist.c
+++ b/common/bloblist.c
@@ -576,14 +576,17 @@ int bloblist_maybe_init(void)
 
 int bloblist_check_reg_conv(ulong rfdt, ulong rzero, ulong rsig)
 {
-	ulong version = BLOBLIST_REGCONV_VER;
+	u64 version = BLOBLIST_REGCONV_VER;
 	ulong sigval;
 
-	sigval = (IS_ENABLED(CONFIG_64BIT)) ?
-			((BLOBLIST_MAGIC & ((1UL << BLOBLIST_REGCONV_SHIFT_64) - 1)) |
-			 ((version  & BLOBLIST_REGCONV_MASK) << BLOBLIST_REGCONV_SHIFT_64)) :
-			((BLOBLIST_MAGIC & ((1UL << BLOBLIST_REGCONV_SHIFT_32) - 1)) |
+	if ((IS_ENABLED(CONFIG_64BIT) && !IS_ENABLED(CONFIG_SPL_BUILD)) ||
+			(IS_ENABLED(CONFIG_SPL_64BIT) && IS_ENABLED(CONFIG_SPL_BUILD))) {
+		sigval = ((BLOBLIST_MAGIC & ((1ULL << BLOBLIST_REGCONV_SHIFT_64) - 1)) |
+			 ((version  & BLOBLIST_REGCONV_MASK) << BLOBLIST_REGCONV_SHIFT_64));
+	} else {
+		sigval = ((BLOBLIST_MAGIC & ((1UL << BLOBLIST_REGCONV_SHIFT_32) - 1)) |
 			 ((version  & BLOBLIST_REGCONV_MASK) << BLOBLIST_REGCONV_SHIFT_32));
+	}
 
 	if (rzero || rsig != sigval ||
 	    rfdt != (ulong)bloblist_find(BLOBLISTT_CONTROL_FDT, 0)) {
diff --git a/include/limits.h b/include/limits.h
index 4700cc7a59..1d0bbf69be 100644
--- a/include/limits.h
+++ b/include/limits.h
@@ -9,7 +9,8 @@
 #define UINT32_MAX  0xffffffffU
 #define UINT64_MAX  0xffffffffffffffffULL
 
-#ifdef CONFIG_64BIT
+#if (defined(CONFIG_64BIT) && !defined(CONFIG_SPL_BUILD)) || \
+	(defined(CONFIG_SPL_64BIT) && defined(CONFIG_SPL_BUILD))
     #define UINTPTR_MAX UINT64_MAX
 #else
     #define UINTPTR_MAX UINT32_MAX
