sandbox: Remove OF_HOSTFILEWIP/2021-10-18-OF_xxx-cleanup

OF_HOSTFILE is used on sandbox configs only.  Although it's pretty
unique and rarely causes confusion,  we are better of having simpler
config options for the DTB.

So let's replace that with the existing OF_BOARD.  U-Boot would then
have only three config options for the DTB origin.
- OF_SEPARATE, build separately from U-Boot
- OF_BOARD, board specific way of providing the DTB
- OF_EMBED embedded in the u-boot binary(should not be used in production)

Signed-off-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>

31 files changed, 81 insertions, 69 deletions

diff --git a/Makefile b/Makefile
index f911f70..94c4fd5 100644
--- a/Makefile
+++ b/Makefile
@@ -943,7 +943,7 @@ INPUTS-$(CONFIG_BINMAN_STANDALONE_FDT) += u-boot.dtb
 ifeq ($(CONFIG_SPL_FRAMEWORK),y)
 INPUTS-$(CONFIG_OF_SEPARATE) += u-boot-dtb.img
 endif
-INPUTS-$(CONFIG_OF_HOSTFILE) += u-boot.dtb
+INPUTS-$(CONFIG_SANDBOX) += u-boot.dtb
 ifneq ($(CONFIG_SPL_TARGET),)
 INPUTS-$(CONFIG_SPL) += $(CONFIG_SPL_TARGET:"%"=%)
 endif
@@ -1406,7 +1406,7 @@ u-boot-lzma.img: u-boot.bin.lzma FORCE
 
 u-boot-dtb.img u-boot.img u-boot.kwb u-boot.pbl u-boot-ivt.img: \
 		$(if $(CONFIG_SPL_LOAD_FIT),u-boot-nodtb.bin \
-			$(if $(CONFIG_OF_SEPARATE)$(CONFIG_OF_EMBED)$(CONFIG_OF_HOSTFILE)$(CONFIG_BINMAN_STANDALONE_FDT),dts/dt.dtb) \
+			$(if $(CONFIG_OF_SEPARATE)$(CONFIG_OF_EMBED)$(CONFIG_SANDBOX)$(CONFIG_BINMAN_STANDALONE_FDT),dts/dt.dtb) \
 		,$(UBOOT_BIN)) FORCE
 	$(call if_changed,mkimage)
 	$(BOARD_SIZE_CHECK)
@@ -1420,7 +1420,7 @@ MKIMAGEFLAGS_u-boot.itb += -B 0x8
 
 ifdef U_BOOT_ITS
 u-boot.itb: u-boot-nodtb.bin \
-		$(if $(CONFIG_OF_SEPARATE)$(CONFIG_OF_EMBED)$(CONFIG_OF_HOSTFILE),dts/dt.dtb) \
+		$(if $(CONFIG_OF_SEPARATE)$(CONFIG_OF_EMBED)$(CONFIG_SANDBOX),dts/dt.dtb) \
 		$(U_BOOT_ITS) FORCE
 	$(call if_changed,mkfitimage)
 	$(BOARD_SIZE_CHECK)
diff --git a/arch/arm/mach-stm32mp/boot_params.c b/arch/arm/mach-stm32mp/boot_params.c
index 84647e7..e91ef1b 100644
--- a/arch/arm/mach-stm32mp/boot_params.c
+++ b/arch/arm/mach-stm32mp/boot_params.c
@@ -33,10 +33,11 @@ void save_boot_params(unsigned long r0, unsigned long r1, unsigned long r2,
  * Use the saved FDT address provided by TF-A at boot time (NT_FW_CONFIG =
  * Non Trusted Firmware configuration file) when the pointer is valid
  */
-void *board_fdt_blob_setup(void)
+void *board_fdt_blob_setup(int *err)
 {
 	log_debug("%s: nt_fw_dtb=%lx\n", __func__, nt_fw_dtb);
 
+	*err = 0;
 	/* use external device tree only if address is valid */
 	if (nt_fw_dtb >= STM32_DDR_BASE) {
 		if (fdt_magic(nt_fw_dtb) == FDT_MAGIC)
diff --git a/arch/sandbox/cpu/cpu.c b/arch/sandbox/cpu/cpu.c
index 48636ab..9887d09 100644
--- a/arch/sandbox/cpu/cpu.c
+++ b/arch/sandbox/cpu/cpu.c
@@ -291,44 +291,51 @@ void invalidate_dcache_range(unsigned long start, unsigned long stop)
 {
 }
 
-int sandbox_read_fdt_from_file(void)
+void *board_fdt_blob_setup(int *ret)
 {
 	struct sandbox_state *state = state_get_current();
 	const char *fname = state->fdt_fname;
-	void *blob;
+	void *blob = NULL;
 	loff_t size;
 	int err;
 	int fd;
 
 	blob = map_sysmem(CONFIG_SYS_FDT_LOAD_ADDR, 0);
+	*ret = 0;
 	if (!state->fdt_fname) {
 		err = fdt_create_empty_tree(blob, 256);
 		if (!err)
 			goto done;
 		printf("Unable to create empty FDT: %s\n", fdt_strerror(err));
-		return -EINVAL;
+		*ret = -EINVAL;
+		goto fail;
 	}
 
 	err = os_get_filesize(fname, &size);
 	if (err < 0) {
-		printf("Failed to file FDT file '%s'\n", fname);
-		return err;
+		printf("Failed to find FDT file '%s'\n", fname);
+		*ret = err;
+		goto fail;
 	}
 	fd = os_open(fname, OS_O_RDONLY);
 	if (fd < 0) {
 		printf("Failed to open FDT file '%s'\n", fname);
-		return -EACCES;
+		*ret = -EACCES;
+		goto fail;
 	}
+
 	if (os_read(fd, blob, size) != size) {
 		os_close(fd);
-		return -EIO;
+		printf("Failed to read FDT file '%s'\n", fname);
+		*ret =  -EIO;
+		goto fail;
 	}
 	os_close(fd);
 
 done:
-	gd->fdt_blob = blob;
-
-	return 0;
+	return blob;
+fail:
+	return NULL;
 }
 
 ulong timer_get_boot_us(void)
diff --git a/arch/sandbox/include/asm/u-boot-sandbox.h b/arch/sandbox/include/asm/u-boot-sandbox.h
index 73b1897..56dc13c 100644
--- a/arch/sandbox/include/asm/u-boot-sandbox.h
+++ b/arch/sandbox/include/asm/u-boot-sandbox.h
@@ -77,14 +77,6 @@ int pci_unmap_physmem(const void *addr, unsigned long len,
 void sandbox_set_enable_pci_map(int enable);
 
 /**
- * sandbox_read_fdt_from_file() - Read a device tree from a file
- *
- * Read a device tree file from a host file and set it up for use as the
- * control FDT.
- */
-int sandbox_read_fdt_from_file(void);
-
-/**
  * sandbox_reset() - reset sandbox
  *
  * This functions implements the cold reboot of the sandbox. It relaunches the
diff --git a/board/AndesTech/ax25-ae350/ax25-ae350.c b/board/AndesTech/ax25-ae350/ax25-ae350.c
index b28894e..0fbf747 100644
--- a/board/AndesTech/ax25-ae350/ax25-ae350.c
+++ b/board/AndesTech/ax25-ae350/ax25-ae350.c
@@ -56,11 +56,13 @@ ulong board_flash_get_legacy(ulong base, int banknum, flash_info_t *info)
 
 void *board_fdt_blob_setup(void)
 {
+	*err = 0;
 #if CONFIG_IS_ENABLED(OF_BOARD)
 	return (void *)(ulong)gd->arch.firmware_fdt_addr;
 #elif CONFIG_IS_ENABLED(OF_SEPARATE)
 	return (void *)CONFIG_SYS_FDT_BASE;
 #else
+	*err = -EINVAL;
 	return NULL;
 #endif
 }
diff --git a/board/Marvell/octeontx/board-fdt.c b/board/Marvell/octeontx/board-fdt.c
index 1db2a4a..e989c37 100644
--- a/board/Marvell/octeontx/board-fdt.c
+++ b/board/Marvell/octeontx/board-fdt.c
@@ -301,7 +301,8 @@ int ft_board_setup(void *blob, struct bd_info *bd)
  *
  * @return	FDT base address received from ATF in x1 register
  */
-void *board_fdt_blob_setup(void)
+void *board_fdt_blob_setup(int *err)
 {
+	*err = 0;
 	return (void *)fdt_base_addr;
 }
diff --git a/board/Marvell/octeontx2/board-fdt.c b/board/Marvell/octeontx2/board-fdt.c
index a4771af..e2cfe01 100644
--- a/board/Marvell/octeontx2/board-fdt.c
+++ b/board/Marvell/octeontx2/board-fdt.c
@@ -215,7 +215,8 @@ int ft_board_setup(void *blob, struct bd_info *bd)
  *
  * @return	FDT base address received from ATF in x1 register
  */
-void *board_fdt_blob_setup(void)
+void *board_fdt_blob_setup(int *err)
 {
+	*err = 0;
 	return (void *)fdt_base_addr;
 }
diff --git a/board/Marvell/octeontx2/board.c b/board/Marvell/octeontx2/board.c
index 4e8cb83..63aa2d6 100644
--- a/board/Marvell/octeontx2/board.c
+++ b/board/Marvell/octeontx2/board.c
@@ -226,12 +226,13 @@ static int do_go_uboot(struct cmd_tbl *cmdtp, int flag, int argc,
 	uboot_entry_t entry;
 	ulong addr;
 	void *fdt;
+	int err;
 
 	if (argc < 2)
 		return CMD_RET_USAGE;
 
 	addr = hextoul(argv[1], NULL);
-	fdt = board_fdt_blob_setup();
+	fdt = board_fdt_blob_setup(&err);
 	entry = (uboot_entry_t)addr;
 	flush_cache((ulong)addr, 1 << 20);	/* 1MiB should be enough */
 	dcache_disable();
diff --git a/board/armltd/vexpress64/vexpress64.c b/board/armltd/vexpress64/vexpress64.c
index 2e42602..d2f307c 100644
--- a/board/armltd/vexpress64/vexpress64.c
+++ b/board/armltd/vexpress64/vexpress64.c
@@ -131,12 +131,15 @@ static phys_addr_t find_dtb_in_nor_flash(const char *partname)
 	return ~0;
 }
 
-void *board_fdt_blob_setup(void)
+void *board_fdt_blob_setup(int *err)
 {
 	phys_addr_t fdt_rom_addr = find_dtb_in_nor_flash(CONFIG_JUNO_DTB_PART);
 
-	if (fdt_rom_addr == ~0UL)
+	*err = 0;
+	if (fdt_rom_addr == ~0UL) {
+		*err = -ENXIO;
 		return NULL;
+	}
 
 	return (void *)fdt_rom_addr;
 }
diff --git a/board/broadcom/bcmstb/bcmstb.c b/board/broadcom/bcmstb/bcmstb.c
index 723ebda..07aeb09 100644
--- a/board/broadcom/bcmstb/bcmstb.c
+++ b/board/broadcom/bcmstb/bcmstb.c
@@ -131,8 +131,9 @@ int board_late_init(void)
 	return 0;
 }
 
-void *board_fdt_blob_setup(void)
+void *board_fdt_blob_setup(int *err)
 {
+	*err = 0;
 	/* Stored the DTB address there during our init */
 	return (void *)prior_stage_fdt_address;
 }
diff --git a/board/emulation/qemu-arm/qemu-arm.c b/board/emulation/qemu-arm/qemu-arm.c
index aa68bef..16d5a97 100644
--- a/board/emulation/qemu-arm/qemu-arm.c
+++ b/board/emulation/qemu-arm/qemu-arm.c
@@ -94,8 +94,9 @@ int dram_init_banksize(void)
 	return 0;
 }
 
-void *board_fdt_blob_setup(void)
+void *board_fdt_blob_setup(int *err)
 {
+	*err = 0;
 	/* QEMU loads a generated DTB for us at the start of RAM. */
 	return (void *)CONFIG_SYS_SDRAM_BASE;
 }
diff --git a/board/emulation/qemu-ppce500/qemu-ppce500.c b/board/emulation/qemu-ppce500/qemu-ppce500.c
index 924cc02..7d8ba34 100644
--- a/board/emulation/qemu-ppce500/qemu-ppce500.c
+++ b/board/emulation/qemu-ppce500/qemu-ppce500.c
@@ -333,8 +333,9 @@ u32 cpu_mask(void)
  *
  * @return virtual address of FDT received from QEMU in r3 register
  */
-void *board_fdt_blob_setup(void)
+void *board_fdt_blob_setup(int *err)
 {
+	*err = 0;
 	return get_fdt_virt();
 }
 
diff --git a/board/emulation/qemu-riscv/qemu-riscv.c b/board/emulation/qemu-riscv/qemu-riscv.c
index 2a26e26..b0d9dd5 100644
--- a/board/emulation/qemu-riscv/qemu-riscv.c
+++ b/board/emulation/qemu-riscv/qemu-riscv.c
@@ -72,8 +72,9 @@ int board_fit_config_name_match(const char *name)
 }
 #endif
 
-void *board_fdt_blob_setup(void)
+void *board_fdt_blob_setup(int *err)
 {
+	*err = 0;
 	/* Stored the DTB address there during our init */
 	return (void *)(ulong)gd->arch.firmware_fdt_addr;
 }
diff --git a/board/highbank/highbank.c b/board/highbank/highbank.c
index ffb6fd9..b5fa510 100644
--- a/board/highbank/highbank.c
+++ b/board/highbank/highbank.c
@@ -111,8 +111,9 @@ int ft_board_setup(void *fdt, struct bd_info *bd)
 }
 #endif
 
-void *board_fdt_blob_setup(void)
+void *board_fdt_blob_setup(int *err)
 {
+	*err = 0;
 	/*
 	 * The ECME management processor loads the DTB from NOR flash
 	 * into DRAM (at 4KB), where it gets patched to contain the
diff --git a/board/raspberrypi/rpi/rpi.c b/board/raspberrypi/rpi/rpi.c
index 0c7d58d..55afaa5 100644
--- a/board/raspberrypi/rpi/rpi.c
+++ b/board/raspberrypi/rpi/rpi.c
@@ -488,10 +488,14 @@ int board_init(void)
 /*
  * If the firmware passed a device tree use it for U-Boot.
  */
-void *board_fdt_blob_setup(void)
+void *board_fdt_blob_setup(int *err)
 {
-	if (fdt_magic(fw_dtb_pointer) != FDT_MAGIC)
+	*err = 0;
+	if (fdt_magic(fw_dtb_pointer) != FDT_MAGIC) {
+		*err = -ENXIO;
 		return NULL;
+	}
+
 	return (void *)fw_dtb_pointer;
 }
 
diff --git a/board/sifive/unleashed/unleashed.c b/board/sifive/unleashed/unleashed.c
index 8cd514d..8f57ca9 100644
--- a/board/sifive/unleashed/unleashed.c
+++ b/board/sifive/unleashed/unleashed.c
@@ -114,8 +114,9 @@ int misc_init_r(void)
 
 #endif
 
-void *board_fdt_blob_setup(void)
+void *board_fdt_blob_setup(int *err)
 {
+	*err = 0;
 	if (IS_ENABLED(CONFIG_OF_SEPARATE)) {
 		if (gd->arch.firmware_fdt_addr)
 			return (ulong *)gd->arch.firmware_fdt_addr;
diff --git a/board/sifive/unmatched/unmatched.c b/board/sifive/unmatched/unmatched.c
index d90b252..549f9f8 100644
--- a/board/sifive/unmatched/unmatched.c
+++ b/board/sifive/unmatched/unmatched.c
@@ -11,8 +11,9 @@
 #include <dm.h>
 #include <asm/sections.h>
 
-void *board_fdt_blob_setup(void)
+void *board_fdt_blob_setup(int *err)
 {
+	*err = 0;
 	if (IS_ENABLED(CONFIG_OF_SEPARATE)) {
 		if (gd->arch.firmware_fdt_addr)
 			return (ulong *)gd->arch.firmware_fdt_addr;
diff --git a/board/socrates/socrates.c b/board/socrates/socrates.c
index 3ba2fbb..a81cb7b 100644
--- a/board/socrates/socrates.c
+++ b/board/socrates/socrates.c
@@ -220,13 +220,15 @@ int ft_board_setup(void *blob, struct bd_info *bd)
 #endif /* CONFIG_OF_BOARD_SETUP */
 
 #if defined(CONFIG_OF_SEPARATE)
-void *board_fdt_blob_setup(void)
+void *board_fdt_blob_setup(int *err)
 {
 	void *fw_dtb;
 
+	*err = 0;
 	fw_dtb = (void *)(CONFIG_SYS_TEXT_BASE - CONFIG_ENV_SECT_SIZE);
 	if (fdt_magic(fw_dtb) != FDT_MAGIC) {
 		printf("DTB is not passed via %x\n", (u32)fw_dtb);
+		*err = -ENXIO;
 		return NULL;
 	}
 
diff --git a/board/xen/xenguest_arm64/xenguest_arm64.c b/board/xen/xenguest_arm64/xenguest_arm64.c
index da0ddee..6e10bba 100644
--- a/board/xen/xenguest_arm64/xenguest_arm64.c
+++ b/board/xen/xenguest_arm64/xenguest_arm64.c
@@ -39,10 +39,13 @@ int board_init(void)
  * x0 is the physical address of the device tree blob (dtb) in system RAM.
  * This is stored in rom_pointer during low level init.
  */
-void *board_fdt_blob_setup(void)
+void *board_fdt_blob_setup(int *err)
 {
-	if (fdt_magic(rom_pointer[0]) != FDT_MAGIC)
+	*err = 0;
+	if (fdt_magic(rom_pointer[0]) != FDT_MAGIC) {
+		*err = -ENXIO;
 		return NULL;
+	}
 	return (void *)rom_pointer[0];
 }
 
diff --git a/board/xilinx/common/board.c b/board/xilinx/common/board.c
index 9006bd3..c577fc3 100644
--- a/board/xilinx/common/board.c
+++ b/board/xilinx/common/board.c
@@ -320,7 +320,7 @@ __maybe_unused int xilinx_read_eeprom(void)
 }
 
 #if defined(CONFIG_OF_BOARD) || defined(CONFIG_OF_SEPARATE)
-void *board_fdt_blob_setup(void)
+void *board_fdt_blob_setup(int *err)
 {
 	void *fdt_blob;
 
@@ -353,6 +353,7 @@ void *board_fdt_blob_setup(void)
 		return fdt_blob;
 
 	debug("DTB is also not passed via %p\n", fdt_blob);
+	*err = -ENXIO;
 
 	return NULL;
 }
diff --git a/configs/sandbox64_defconfig b/configs/sandbox64_defconfig
index df9633d..838280e 100644
--- a/configs/sandbox64_defconfig
+++ b/configs/sandbox64_defconfig
@@ -88,7 +88,6 @@ CONFIG_MAC_PARTITION=y
 CONFIG_AMIGA_PARTITION=y
 CONFIG_OF_CONTROL=y
 CONFIG_OF_LIVE=y
-CONFIG_OF_HOSTFILE=y
 CONFIG_ENV_IS_NOWHERE=y
 CONFIG_ENV_IS_IN_EXT4=y
 CONFIG_ENV_EXT4_INTERFACE="host"
diff --git a/configs/sandbox_defconfig b/configs/sandbox_defconfig
index 9a462cb..d07a7f3 100644
--- a/configs/sandbox_defconfig
+++ b/configs/sandbox_defconfig
@@ -113,7 +113,6 @@ CONFIG_MAC_PARTITION=y
 CONFIG_AMIGA_PARTITION=y
 CONFIG_OF_CONTROL=y
 CONFIG_OF_LIVE=y
-CONFIG_OF_HOSTFILE=y
 CONFIG_ENV_IS_NOWHERE=y
 CONFIG_ENV_IS_IN_EXT4=y
 CONFIG_ENV_EXT4_INTERFACE="host"
diff --git a/configs/sandbox_flattree_defconfig b/configs/sandbox_flattree_defconfig
index 1101574..5980c86 100644
--- a/configs/sandbox_flattree_defconfig
+++ b/configs/sandbox_flattree_defconfig
@@ -69,7 +69,6 @@ CONFIG_CMD_EXT4_WRITE=y
 CONFIG_MAC_PARTITION=y
 CONFIG_AMIGA_PARTITION=y
 CONFIG_OF_CONTROL=y
-CONFIG_OF_HOSTFILE=y
 CONFIG_ENV_IS_NOWHERE=y
 CONFIG_ENV_IS_IN_EXT4=y
 CONFIG_ENV_EXT4_INTERFACE="host"
diff --git a/configs/sandbox_noinst_defconfig b/configs/sandbox_noinst_defconfig
index b358456..238604f 100644
--- a/configs/sandbox_noinst_defconfig
+++ b/configs/sandbox_noinst_defconfig
@@ -88,7 +88,6 @@ CONFIG_MAC_PARTITION=y
 CONFIG_AMIGA_PARTITION=y
 CONFIG_OF_CONTROL=y
 CONFIG_SPL_OF_CONTROL=y
-CONFIG_OF_HOSTFILE=y
 CONFIG_SPL_OF_PLATDATA=y
 CONFIG_ENV_IS_NOWHERE=y
 CONFIG_ENV_IS_IN_EXT4=y
diff --git a/configs/sandbox_spl_defconfig b/configs/sandbox_spl_defconfig
index 73cf5dd..b9da8dc 100644
--- a/configs/sandbox_spl_defconfig
+++ b/configs/sandbox_spl_defconfig
@@ -89,7 +89,6 @@ CONFIG_MAC_PARTITION=y
 CONFIG_AMIGA_PARTITION=y
 CONFIG_OF_CONTROL=y
 CONFIG_SPL_OF_CONTROL=y
-CONFIG_OF_HOSTFILE=y
 CONFIG_SPL_OF_PLATDATA=y
 CONFIG_SPL_OF_PLATDATA_INST=y
 CONFIG_ENV_IS_NOWHERE=y
diff --git a/configs/tools-only_defconfig b/configs/tools-only_defconfig
index 64a015b..88eee95 100644
--- a/configs/tools-only_defconfig
+++ b/configs/tools-only_defconfig
@@ -14,7 +14,6 @@ CONFIG_MISC_INIT_F=y
 CONFIG_BOOTP_DNS2=y
 # CONFIG_CMD_DATE is not set
 CONFIG_OF_CONTROL=y
-CONFIG_OF_HOSTFILE=y
 CONFIG_SYS_RELOC_GD_ENV_ADDR=y
 CONFIG_BOOTP_SEND_HOSTNAME=y
 CONFIG_IP_DEFRAG=y
diff --git a/doc/develop/devicetree/control.rst b/doc/develop/devicetree/control.rst
index e84dfb6..0e6f85d 100644
--- a/doc/develop/devicetree/control.rst
+++ b/doc/develop/devicetree/control.rst
@@ -108,10 +108,9 @@ If CONFIG_OF_BOARD is defined, a board-specific routine will provide the
 devicetree at runtime, for example if an earlier bootloader stage creates
 it and passes it to U-Boot.
 
-If CONFIG_OF_HOSTFILE is defined, then it will be read from a file on
-startup. This is only useful for sandbox. Use the -d flag to U-Boot to
-specify the file to read, -D for the default and -T for the test devicetree,
-used to run sandbox unit tests.
+If CONFIG_SANDBOX is defined, then it will be read from a file on
+startup. Use the -d flag to U-Boot to specify the file to read, -D for the
+default and -T for the test devicetree, used to run sandbox unit tests.
 
 You cannot use more than one of these options at the same time.
 
diff --git a/dts/Kconfig b/dts/Kconfig
index fc41305..af71f72 100644
--- a/dts/Kconfig
+++ b/dts/Kconfig
@@ -101,6 +101,7 @@ config OF_LIVE
 choice
 	prompt "Provider of DTB for DT control"
 	depends on OF_CONTROL
+	default OF_BOARD if SANDBOX
 
 config OF_SEPARATE
 	bool "Separate DTB for DT control"
@@ -119,20 +120,11 @@ config OF_EMBED
 
 config OF_BOARD
 	bool "Provided by the board (e.g a previous loader) at runtime"
-	depends on !SANDBOX
 	help
 	  If this option is enabled, the device tree will be provided by
 	  the board at runtime if the board supports it, instead of being
 	  bundled with the image.
 
-config OF_HOSTFILE
-	bool "Host filed DTB for DT control"
-	depends on SANDBOX
-	help
-	  If this option is enabled, DTB will be read from a file on startup.
-	  This is only useful for Sandbox.  Use the -d flag to U-Boot to
-	  specify the file to read.
-
 endchoice
 
 config DEFAULT_DEVICE_TREE
diff --git a/include/fdtdec.h b/include/fdtdec.h
index 2398142..6c7ab88 100644
--- a/include/fdtdec.h
+++ b/include/fdtdec.h
@@ -1158,8 +1158,10 @@ int fdtdec_resetup(int *rescan);
  * Board-specific FDT initialization. Returns the address to a device tree blob.
  * Called when CONFIG_OF_BOARD is defined, or if CONFIG_OF_SEPARATE is defined
  * and the board implements it.
+ *
+ * @err internal error code if we fail to setup a DTB
  */
-void *board_fdt_blob_setup(void);
+void *board_fdt_blob_setup(int *err);
 
 /*
  * Decode the size of memory
diff --git a/lib/fdtdec.c b/lib/fdtdec.c
index 959b337..7681f27 100644
--- a/lib/fdtdec.c
+++ b/lib/fdtdec.c
@@ -1213,9 +1213,11 @@ static int uncompress_blob(const void *src, ulong sz_src, void **dstp)
  * For CONFIG_OF_SEPARATE, the board may optionally implement this to
  * provide and/or fixup the fdt.
  */
-__weak void *board_fdt_blob_setup(void)
+__weak void *board_fdt_blob_setup(int *err)
 {
 	void *fdt_blob = NULL;
+
+	*err = 0;
 #ifdef CONFIG_SPL_BUILD
 	/* FDT is at end of BSS unless it is in a different memory region */
 	if (IS_ENABLED(CONFIG_SPL_SEPARATE_BSS))
@@ -1226,6 +1228,7 @@ __weak void *board_fdt_blob_setup(void)
 	/* FDT is at end of image */
 	fdt_blob = (ulong *)&_end;
 #endif
+
 	return fdt_blob;
 }
 #endif
@@ -1607,12 +1610,9 @@ int fdtdec_setup(void)
 #  endif
 # elif defined(CONFIG_OF_BOARD) || defined(CONFIG_OF_SEPARATE)
 	/* Allow the board to override the fdt address. */
-	gd->fdt_blob = board_fdt_blob_setup();
-# elif defined(CONFIG_OF_HOSTFILE)
-	if (sandbox_read_fdt_from_file()) {
-		puts("Failed to read control FDT\n");
-		return -1;
-	}
+	gd->fdt_blob = board_fdt_blob_setup(&ret);
+	if (ret)
+		return ret;
 # endif
 # ifndef CONFIG_SPL_BUILD
 	/* Allow the early environment to override the fdt address */
diff --git a/scripts/Makefile.spl b/scripts/Makefile.spl
index 6f26eb1..3243ce0 100644
--- a/scripts/Makefile.spl
+++ b/scripts/Makefile.spl
@@ -297,10 +297,10 @@ endif
 
 # Build the .dtb file if needed
 #   - OF_REAL is enabled
-#   - we have either OF_SEPARATE or OF_HOSTFILE
+#   - we have either OF_SEPARATE or SANDBOX
 build_dtb :=
 ifneq ($(CONFIG_$(SPL_TPL_)OF_REAL),)
-ifeq ($(CONFIG_OF_SEPARATE)$(CONFIG_OF_HOSTFILE),y)
+ifeq ($(CONFIG_OF_SEPARATE)$(CONFIG_SANDBOX),y)
 build_dtb := y
 endif
 endif