diff --git a/arch/arm/dts/Makefile b/arch/arm/dts/Makefile
index 7ed222d..84b7e53 100644
--- a/arch/arm/dts/Makefile
+++ b/arch/arm/dts/Makefile
@@ -100,6 +100,7 @@
 	armada-7040-db-nand.dtb			\
 	armada-8040-db.dtb			\
 	armada-8040-mcbin.dtb			\
+	armada-8040-clearfog-gt-8k.dtb		\
 	armada-xp-gp.dtb			\
 	armada-xp-maxbcm.dtb			\
 	armada-xp-synology-ds414.dtb		\
diff --git a/arch/arm/dts/armada-8040-clearfog-gt-8k.dts b/arch/arm/dts/armada-8040-clearfog-gt-8k.dts
new file mode 100644
index 0000000..498105f
--- /dev/null
+++ b/arch/arm/dts/armada-8040-clearfog-gt-8k.dts
@@ -0,0 +1,315 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2018 SolidRun ltd
+ */
+
+#include "armada-8040.dtsi"
+
+/ {
+	model = "ClearFog-GT-8K";
+	compatible = "solidrun,clearfog-gt-8k",
+		     "marvell,armada8040";
+
+	chosen {
+		stdout-path = "serial0:115200n8";
+	};
+
+	aliases {
+		i2c0 = &cpm_i2c0;
+		i2c1 = &cpm_i2c1;
+		spi0 = &cps_spi1;
+	};
+
+	memory@00000000 {
+		device_type = "memory";
+		reg = <0x0 0x0 0x0 0x80000000>;
+	};
+
+	simple-bus {
+		compatible = "simple-bus";
+
+		reg_usb3h0_vbus: usb3-vbus0 {
+			compatible = "regulator-fixed";
+			pinctrl-names = "default";
+			pinctrl-0 = <&cpm_xhci_vbus_pins>;
+			regulator-name = "reg-usb3h0-vbus";
+			regulator-min-microvolt = <5000000>;
+			regulator-max-microvolt = <5000000>;
+			startup-delay-us = <300000>;
+			shutdown-delay-us = <500000>;
+			regulator-force-boot-off;
+			gpio = <&cpm_gpio1 15 GPIO_ACTIVE_LOW>; /* GPIO[47] */
+		};
+	};
+};
+
+&uart0 {
+	status = "okay";
+};
+
+&ap_pinctl {
+	/*
+	 * MPP Bus:
+	 * eMMC [0-10]
+	 * UART0 [11,19]
+	 */
+		  /* 0 1 2 3 4 5 6 7 8 9 */
+	pin-func = < 1 1 1 1 1 1 1 1 1 1
+		     1 3 0 0 0 0 0 0 0 3 >;
+};
+
+/* on-board eMMC */
+&ap_sdhci0 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&ap_emmc_pins>;
+	bus-width = <8>;
+	status = "okay";
+};
+
+&cpm_pinctl {
+	/*
+	 * MPP Bus:
+	 * [0-31] = 0xff: Keep default CP0_shared_pins:
+	 * [11] CLKOUT_MPP_11 (out)
+	 * [23] LINK_RD_IN_CP2CP (in)
+	 * [25] CLKOUT_MPP_25 (out)
+	 * [29] AVS_FB_IN_CP2CP (in)
+	 * [32, 33, 34] pci0/1/2 reset
+	 * [35-38] CP0 I2C1 and I2C0
+	 * [39] GPIO reset button
+	 * [40,41] LED0 and LED1
+	 * [43] 1512 phy reset
+	 * [47] USB VBUS EN (active low)
+	 * [48] FAN PWM
+	 * [49] SFP+ present signal
+	 * [50] TPM interrupt
+	 * [51] WLAN0 disable
+	 * [52] WLAN1 disable
+	 * [53] LTE disable
+	 * [54] NFC reset
+	 * [55] Micro SD card detect
+	 * [56-61] Micro SD
+	 */
+		/*   0    1    2    3    4    5    6    7    8    9 */
+	pin-func = < 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff
+		     0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff
+		     0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff
+		     0xff 0    0    0    0    2    2    2    2    0
+		     0    0    0    0    0    0    0    0    0    0
+		     0    0    0    0    0    0    0xe  0xe  0xe  0xe
+		     0xe  0xe  0 >;
+
+	cpm_xhci_vbus_pins: cpm-xhci-vbus-pins {
+		marvell,pins = < 47 >;
+		marvell,function = <0>;
+	};
+
+	cps_1g_phy_reset: cps-1g-phy-reset {
+		marvell,pins = < 43 >;
+		marvell,function = <0>;
+	};
+};
+
+/* uSD slot */
+&cpm_sdhci0 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&cpm_sdhci_pins>;
+	bus-width = <4>;
+	status = "okay";
+};
+
+&cpm_pcie0 {
+	num-lanes = <1>;
+	status = "okay";
+};
+
+&cpm_i2c0 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&cpm_i2c0_pins>;
+	status = "okay";
+	clock-frequency = <100000>;
+};
+
+&cpm_i2c1 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&cpm_i2c1_pins>;
+	status = "okay";
+	clock-frequency = <100000>;
+};
+
+&cpm_sata0 {
+	status = "okay";
+};
+
+&cpm_comphy {
+	/*
+	 * CP0 Serdes Configuration:
+	 * Lane 0: PCIe0 (x1)
+	 * Lane 1: Not connected
+	 * Lane 2: SFI (10G)
+	 * Lane 3: Not connected
+	 * Lane 4: USB 3.0 host port1 (can be PCIe)
+	 * Lane 5: Not connected
+	 */
+	phy0 {
+		phy-type = <PHY_TYPE_PEX0>;
+	};
+	phy1 {
+		phy-type = <PHY_TYPE_UNCONNECTED>;
+	};
+	phy2 {
+		phy-type = <PHY_TYPE_SFI>;
+	};
+	phy3 {
+		phy-type = <PHY_TYPE_UNCONNECTED>;
+	};
+	phy4 {
+		phy-type = <PHY_TYPE_USB3_HOST1>;
+	};
+	phy5 {
+		phy-type = <PHY_TYPE_UNCONNECTED>;
+	};
+};
+
+&cpm_ethernet {
+        pinctrl-names = "default";
+        status = "okay";
+};
+
+/* 10G SFI SFP */
+&cpm_eth0 {
+        status = "okay";
+        phy-mode = "sfi";
+};
+
+&cps_sata0 {
+	status = "okay";
+};
+
+&cps_usb3_0 {
+	vbus-supply = <&reg_usb3h0_vbus>;
+	status = "okay";
+};
+
+&cps_utmi0 {
+	status = "okay";
+};
+
+&cps_pinctl {
+	/*
+	 * MPP Bus:
+	 * [0-5] TDM
+	 * [6]   VHV Enable
+	 * [7]   CP1 SPI0 CSn1 (FXS)
+	 * [8]   CP1 SPI0 CSn0 (TPM)
+	 * [9.11]CP1 SPI0 MOSI/MISO/CLK
+	 * [13]  CP1 SPI1 MISO (TDM and SPI ROM shared)
+	 * [14]  CP1 SPI1 CS0n (64Mb SPI ROM)
+	 * [15]  CP1 SPI1 MOSI (TDM and SPI ROM shared)
+	 * [16]  CP1 SPI1 CLK (TDM and SPI ROM shared)
+	 * [24]  Topaz switch reset
+	 * [26]  Buzzer
+	 * [27]  CP1 SMI MDIO
+	 * [28]  CP1 SMI MDC
+	 * [29]  CP0 10G SFP TX Disable
+	 * [30]  WPS button
+	 * [31]  Front panel button
+	 * [32-62] = 0xff: Keep default CP1_shared_pins:
+	 */
+		/*   0    1    2    3    4    5    6    7    8    9 */
+	pin-func = < 0x4  0x4  0x4  0x4  0x4  0x4  0x0  0x4  0x4  0x4
+		     0x4  0x4  0x0  0x3  0x3  0x3  0x3  0xff 0xff 0xff
+		     0xff 0xff 0xff 0xff 0x0  0xff 0x0  0x8  0x8  0x0
+		     0x0  0x0  0x0  0xff 0xff 0xff 0xff 0xff 0xff 0xff
+		     0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff
+		     0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff
+		     0xff 0xff 0xff>;
+};
+
+&cps_spi1 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&cps_spi1_pins>;
+	status = "okay";
+
+	spi-flash@0 {
+		compatible = "jedec,spi-nor", "spi-flash";
+		reg = <0>;
+		spi-max-frequency = <10000000>;
+
+		partitions {
+			compatible = "fixed-partitions";
+			#address-cells = <1>;
+			#size-cells = <1>;
+
+			partition@0 {
+				label = "U-Boot";
+				reg = <0 0x200000>;
+			};
+			partition@200000 {
+				label = "Filesystem";
+				reg = <0x200000 0xce0000>;
+			};
+		};
+	};
+};
+
+&cps_comphy {
+	/*
+	 * CP1 Serdes Configuration:
+	 * Lane 0: SATA 1 (RX swapped). Can be PCIe0
+	 * Lane 1: Not used
+	 * Lane 2: USB HOST 0
+	 * Lane 3: SGMII1 - Connected to 1512 port
+	 * Lane 4: Not used
+	 * Lane 5: SGMII2 - Connected to Topaz switch
+	 */
+	phy0 {
+		phy-type = <PHY_TYPE_SATA1>;
+		phy-invert = <PHY_POLARITY_RXD_INVERT>;
+	};
+	phy1 {
+		phy-type = <PHY_TYPE_UNCONNECTED>;
+	};
+	phy2 {
+		phy-type = <PHY_TYPE_USB3_HOST0>;
+	};
+	phy3 {
+		phy-type = <PHY_TYPE_SGMII1>;
+		phy-speed = <PHY_SPEED_1_25G>;
+	};
+	phy4 {
+		phy-type = <PHY_TYPE_UNCONNECTED>;
+	};
+	phy5 {
+		phy-type = <PHY_TYPE_SGMII2>;
+		phy-speed = <PHY_SPEED_3_125G>;
+	};
+};
+
+&cps_mdio {
+	phy0: ethernet-phy@0 {
+		reg = <0>;
+	};
+};
+
+&cps_ethernet {
+	pinctrl-names = "default";
+	pinctrl-0 = <&cps_1g_phy_reset>;
+	status = "okay";
+};
+
+/* 1G SGMII */
+&cps_eth1 {
+	status = "okay";
+	phy-mode = "sgmii";
+	phy = <&phy0>;
+	phy-reset-gpios = <&cpm_gpio1 11 GPIO_ACTIVE_LOW>;
+};
+
+/* 2.5G to Topaz switch */
+&cps_eth2 {
+	status = "okay";
+	phy-mode = "sgmii";
+	phy-speed = <2500>;
+	phy-reset-gpios = <&cps_gpio0 24 GPIO_ACTIVE_LOW>;
+};
diff --git a/arch/arm/include/asm/armv8/mmu.h b/arch/arm/include/asm/armv8/mmu.h
index 62d00d1..4a57320 100644
--- a/arch/arm/include/asm/armv8/mmu.h
+++ b/arch/arm/include/asm/armv8/mmu.h
@@ -7,6 +7,8 @@
 #ifndef _ASM_ARMV8_MMU_H_
 #define _ASM_ARMV8_MMU_H_
 
+#include <linux/const.h>
+
 /*
  * block/section address mask and size definitions.
  */
diff --git a/arch/arm/mach-mvebu/arm64-common.c b/arch/arm/mach-mvebu/arm64-common.c
index f47273f..47bbf69 100644
--- a/arch/arm/mach-mvebu/arm64-common.c
+++ b/arch/arm/mach-mvebu/arm64-common.c
@@ -7,6 +7,7 @@
 #include <dm.h>
 #include <fdtdec.h>
 #include <linux/libfdt.h>
+#include <linux/sizes.h>
 #include <pci.h>
 #include <asm/io.h>
 #include <asm/system.h>
@@ -45,15 +46,62 @@
 
 /* DRAM init code ... */
 
+#define MV_SIP_DRAM_SIZE	0x82000010
+
+static u64 a8k_dram_scan_ap_sz(void)
+{
+	struct pt_regs pregs;
+
+	pregs.regs[0] = MV_SIP_DRAM_SIZE;
+	pregs.regs[1] = SOC_REGS_PHY_BASE;
+	smc_call(&pregs);
+
+	return pregs.regs[0];
+}
+
+static void a8k_dram_init_banksize(void)
+{
+	/*
+	 * The firmware (ATF) leaves a 1G whole above the 3G mark for IO
+	 * devices. Higher RAM is mapped at 4G.
+	 *
+	 * Config 2 DRAM banks:
+	 * Bank 0 - max size 4G - 1G
+	 * Bank 1 - ram size - 4G + 1G
+	 */
+	phys_size_t max_bank0_size = SZ_4G - SZ_1G;
+
+	gd->bd->bi_dram[0].start = CONFIG_SYS_SDRAM_BASE;
+	if (gd->ram_size <= max_bank0_size) {
+		gd->bd->bi_dram[0].size = gd->ram_size;
+		return;
+	}
+
+	gd->bd->bi_dram[0].size = max_bank0_size;
+	if (CONFIG_NR_DRAM_BANKS > 1) {
+		gd->bd->bi_dram[1].start = SZ_4G;
+		gd->bd->bi_dram[1].size = gd->ram_size - max_bank0_size;
+	}
+}
+
 int dram_init_banksize(void)
 {
-	fdtdec_setup_memory_banksize();
+	if (CONFIG_IS_ENABLED(ARMADA_8K))
+		a8k_dram_init_banksize();
+	else
+		fdtdec_setup_memory_banksize();
 
 	return 0;
 }
 
 int dram_init(void)
 {
+	if (CONFIG_IS_ENABLED(ARMADA_8K)) {
+		gd->ram_size = a8k_dram_scan_ap_sz();
+		if (gd->ram_size != 0)
+			return 0;
+	}
+
 	if (fdtdec_setup_mem_size_base() != 0)
 		return -EINVAL;
 
diff --git a/arch/arm/mach-tegra/tegra186/nvtboot_mem.c b/arch/arm/mach-tegra/tegra186/nvtboot_mem.c
index 5c9467b..6214282 100644
--- a/arch/arm/mach-tegra/tegra186/nvtboot_mem.c
+++ b/arch/arm/mach-tegra/tegra186/nvtboot_mem.c
@@ -6,11 +6,10 @@
 #include <common.h>
 #include <fdt_support.h>
 #include <fdtdec.h>
+#include <linux/sizes.h>
 #include <asm/arch/tegra.h>
 #include <asm/armv8/mmu.h>
 
-#define SZ_4G 0x100000000ULL
-
 /*
  * Size of a region that's large enough to hold the relocated U-Boot and all
  * other allocations made around it (stack, heap, page tables, etc.)
diff --git a/arch/mips/include/asm/const.h b/arch/mips/include/asm/const.h
deleted file mode 100644
index ed43b5d..0000000
--- a/arch/mips/include/asm/const.h
+++ /dev/null
@@ -1,27 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-/*
- * const.h: Macros for dealing with constants.
- */
-
-#ifndef _LINUX_CONST_H
-#define _LINUX_CONST_H
-
-/* Some constant macros are used in both assembler and
- * C code.  Therefore we cannot annotate them always with
- * 'UL' and other type specifiers unilaterally.  We
- * use the following macros to deal with this.
- *
- * Similarly, _AT() will cast an expression with a type in C, but
- * leave it unchanged in asm.
- */
-
-#ifdef __ASSEMBLY__
-#define _AT(T,X)	X
-#else
-#define _AT(T,X)	((T)(X))
-#endif
-
-#define _BITUL(x)	(_AC(1,UL) << (x))
-#define _BITULL(x)	(_AC(1,ULL) << (x))
-
-#endif /* !(_LINUX_CONST_H) */
diff --git a/arch/mips/include/asm/mach-generic/spaces.h b/arch/mips/include/asm/mach-generic/spaces.h
index b7eac32..539d0a5 100644
--- a/arch/mips/include/asm/mach-generic/spaces.h
+++ b/arch/mips/include/asm/mach-generic/spaces.h
@@ -7,7 +7,7 @@
 #ifndef _ASM_MACH_GENERIC_SPACES_H
 #define _ASM_MACH_GENERIC_SPACES_H
 
-#include <asm/const.h>
+#include <linux/const.h>
 
 /*
  * This gives the physical RAM offset.
diff --git a/arch/riscv/include/asm/csr.h b/arch/riscv/include/asm/csr.h
index 50fccea..29624fd 100644
--- a/arch/riscv/include/asm/csr.h
+++ b/arch/riscv/include/asm/csr.h
@@ -8,6 +8,8 @@
 #ifndef _ASM_RISCV_CSR_H
 #define _ASM_RISCV_CSR_H
 
+#include <linux/const.h>
+
 /* Status register flags */
 #define SR_SIE		_AC(0x00000002, UL) /* Supervisor Interrupt Enable */
 #define SR_SPIE		_AC(0x00000020, UL) /* Previous Supervisor IE */
diff --git a/board/solidrun/clearfog/MAINTAINERS b/board/solidrun/clearfog/MAINTAINERS
index 298e501..6646d96 100644
--- a/board/solidrun/clearfog/MAINTAINERS
+++ b/board/solidrun/clearfog/MAINTAINERS
@@ -4,3 +4,4 @@
 F:	board/soldrun/clearfog/
 F:	include/configs/clearfog.h
 F:	configs/clearfog_defconfig
+F:	configs/clearfog_gt_8k_defconfig
diff --git a/configs/clearfog_gt_8k_defconfig b/configs/clearfog_gt_8k_defconfig
new file mode 100644
index 0000000..6cd1f89
--- /dev/null
+++ b/configs/clearfog_gt_8k_defconfig
@@ -0,0 +1,75 @@
+CONFIG_ARM=y
+CONFIG_ARCH_MVEBU=y
+CONFIG_SYS_TEXT_BASE=0x00000000
+CONFIG_SYS_MALLOC_F_LEN=0x2000
+CONFIG_TARGET_MVEBU_ARMADA_8K=y
+CONFIG_DEBUG_UART_BASE=0xf0512000
+CONFIG_DEBUG_UART_CLOCK=200000000
+CONFIG_DEFAULT_DEVICE_TREE="armada-8040-clearfog-gt-8k"
+CONFIG_SMBIOS_PRODUCT_NAME=""
+CONFIG_DEBUG_UART=y
+CONFIG_AHCI=y
+CONFIG_DISTRO_DEFAULTS=y
+CONFIG_NR_DRAM_BANKS=1
+# CONFIG_SYS_MALLOC_CLEAR_ON_INIT is not set
+CONFIG_SYS_CONSOLE_INFO_QUIET=y
+# CONFIG_DISPLAY_CPUINFO is not set
+# CONFIG_DISPLAY_BOARDINFO is not set
+CONFIG_DISPLAY_BOARDINFO_LATE=y
+CONFIG_ARCH_EARLY_INIT_R=y
+CONFIG_BOARD_EARLY_INIT_F=y
+# CONFIG_CMD_FLASH is not set
+CONFIG_CMD_GPIO=y
+CONFIG_CMD_I2C=y
+CONFIG_CMD_MMC=y
+CONFIG_CMD_PCI=y
+CONFIG_CMD_SF=y
+CONFIG_CMD_SPI=y
+CONFIG_CMD_USB=y
+# CONFIG_CMD_SETEXPR is not set
+CONFIG_CMD_TFTPPUT=y
+CONFIG_CMD_CACHE=y
+CONFIG_CMD_TIME=y
+CONFIG_CMD_MVEBU_BUBT=y
+CONFIG_CMD_REGULATOR=y
+CONFIG_CMD_EXT4_WRITE=y
+CONFIG_MAC_PARTITION=y
+CONFIG_ENV_IS_IN_SPI_FLASH=y
+CONFIG_AHCI_MVEBU=y
+CONFIG_DM_GPIO=y
+CONFIG_DM_I2C=y
+CONFIG_SYS_I2C_MVTWSI=y
+CONFIG_MISC=y
+CONFIG_DM_MMC=y
+CONFIG_MMC_SDHCI=y
+CONFIG_MMC_SDHCI_XENON=y
+CONFIG_SPI_FLASH=y
+CONFIG_SPI_FLASH_MACRONIX=y
+CONFIG_SPI_FLASH_SPANSION=y
+CONFIG_SPI_FLASH_STMICRO=y
+CONFIG_SPI_FLASH_WINBOND=y
+CONFIG_PHYLIB=y
+CONFIG_PHY_GIGE=y
+CONFIG_PCI=y
+CONFIG_DM_PCI=y
+CONFIG_PCIE_DW_MVEBU=y
+CONFIG_MVEBU_COMPHY_SUPPORT=y
+CONFIG_PINCTRL=y
+CONFIG_PINCTRL_ARMADA_8K=y
+CONFIG_DM_REGULATOR_FIXED=y
+# CONFIG_SPL_SERIAL_PRESENT is not set
+CONFIG_DEBUG_UART_SHIFT=2
+CONFIG_DEBUG_UART_ANNOUNCE=y
+CONFIG_SYS_NS16550=y
+CONFIG_KIRKWOOD_SPI=y
+CONFIG_USB=y
+CONFIG_DM_USB=y
+CONFIG_USB_XHCI_HCD=y
+CONFIG_USB_EHCI_HCD=y
+CONFIG_USB_STORAGE=y
+CONFIG_USB_HOST_ETHER=y
+CONFIG_USB_ETHER_ASIX=y
+CONFIG_USB_ETHER_MCS7830=y
+CONFIG_USB_ETHER_RTL8152=y
+CONFIG_USB_ETHER_SMSC95XX=y
+CONFIG_SMBIOS_MANUFACTURER=""
diff --git a/include/common.h b/include/common.h
index 8b9f859..3f69943 100644
--- a/include/common.h
+++ b/include/common.h
@@ -14,9 +14,6 @@
 typedef volatile unsigned short vu_short;
 typedef volatile unsigned char	vu_char;
 
-/* Allow sharing constants with type modifiers between C and assembly. */
-#define _AC(X, Y)       (X##Y)
-
 #include <config.h>
 #include <errno.h>
 #include <time.h>
@@ -541,16 +538,10 @@
 
 #else	/* __ASSEMBLY__ */
 
-/* Drop a C type modifier (like in 3UL) for constants used in assembly. */
-#define _AC(X, Y)       X
-
 #endif	/* __ASSEMBLY__ */
 
 /* Put only stuff here that the assembler can digest */
 
-/* Declare an unsigned long constant digestable both by C and an assembler. */
-#define UL(x)           _AC(x, UL)
-
 #ifdef CONFIG_POST
 #define CONFIG_HAS_POST
 #ifndef CONFIG_POST_ALT_LIST
diff --git a/include/configs/db-88f6820-amc.h b/include/configs/db-88f6820-amc.h
index 2f1ffa2..e68246c 100644
--- a/include/configs/db-88f6820-amc.h
+++ b/include/configs/db-88f6820-amc.h
@@ -10,11 +10,6 @@
  * High Level Configuration Options (easy to change)
  */
 
-/*
- * TEXT_BASE needs to be below 16MiB, since this area is scrubbed
- * for DDR ECC byte filling in the SPL before loading the main
- * U-Boot into it.
- */
 #define CONFIG_SYS_TCLK		200000000	/* 200MHz */
 
 /*
diff --git a/include/configs/db-88f6820-gp.h b/include/configs/db-88f6820-gp.h
index f2aa21a..3900cbe 100644
--- a/include/configs/db-88f6820-gp.h
+++ b/include/configs/db-88f6820-gp.h
@@ -10,11 +10,6 @@
  * High Level Configuration Options (easy to change)
  */
 
-/*
- * TEXT_BASE needs to be below 16MiB, since this area is scrubbed
- * for DDR ECC byte filling in the SPL before loading the main
- * U-Boot into it.
- */
 #define CONFIG_SYS_TCLK		250000000	/* 250MHz */
 
 /*
diff --git a/include/linux/const.h b/include/linux/const.h
new file mode 100644
index 0000000..379c889
--- /dev/null
+++ b/include/linux/const.h
@@ -0,0 +1,34 @@
+/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
+#ifndef _LINUX_CONST_H
+#define _LINUX_CONST_H
+
+/* const.h: Macros for dealing with constants.  */
+
+/* Some constant macros are used in both assembler and
+ * C code.  Therefore we cannot annotate them always with
+ * 'UL' and other type specifiers unilaterally.  We
+ * use the following macros to deal with this.
+ *
+ * Similarly, _AT() will cast an expression with a type in C, but
+ * leave it unchanged in asm.
+ */
+
+#ifdef __ASSEMBLY__
+#define _AC(X,Y)	X
+#define _AT(T,X)	X
+#else
+#define __AC(X,Y)	(X##Y)
+#define _AC(X,Y)	__AC(X,Y)
+#define _AT(T,X)	((T)(X))
+#endif
+
+#define _UL(x)		(_AC(x, UL))
+#define _ULL(x)		(_AC(x, ULL))
+
+#define _BITUL(x)	(_UL(1) << (x))
+#define _BITULL(x)	(_ULL(1) << (x))
+
+#define UL(x)		(_UL(x))
+#define ULL(x)		(_ULL(x))
+
+#endif /* _LINUX_CONST_H */
diff --git a/include/linux/sizes.h b/include/linux/sizes.h
index ce3e815..fbde0bc 100644
--- a/include/linux/sizes.h
+++ b/include/linux/sizes.h
@@ -8,6 +8,8 @@
 #ifndef __LINUX_SIZES_H__
 #define __LINUX_SIZES_H__
 
+#include <linux/const.h>
+
 #define SZ_1				0x00000001
 #define SZ_2				0x00000002
 #define SZ_4				0x00000004
@@ -44,4 +46,6 @@
 #define SZ_1G				0x40000000
 #define SZ_2G				0x80000000
 
+#define SZ_4G				_AC(0x100000000, ULL)
+
 #endif /* __LINUX_SIZES_H__ */