diff --git a/arch/arm/dts/sunxi-u-boot.dtsi b/arch/arm/dts/sunxi-u-boot.dtsi
index 06da009fa2..4a6ed3a7dd 100644
--- a/arch/arm/dts/sunxi-u-boot.dtsi
+++ b/arch/arm/dts/sunxi-u-boot.dtsi
@@ -64,7 +64,7 @@
 					};
 				};
 
-#ifndef CONFIG_MACH_SUN50I_H616
+#ifdef SCP_ADDR
 				scp {
 					description = "SCP firmware";
 					type = "firmware";
@@ -92,7 +92,7 @@
 				@config-SEQ {
 					description = "NAME";
 					firmware = "atf";
-#ifdef CONFIG_MACH_SUN50I_H616
+#ifndef SCP_ADDR
 					loadables = "uboot";
 #else
 					loadables = "scp", "uboot";
diff --git a/arch/arm/include/asm/arch-sunxi/cpu_sun4i.h b/arch/arm/include/asm/arch-sunxi/cpu_sun4i.h
index 02ce73954d..d4c795d89c 100644
--- a/arch/arm/include/asm/arch-sunxi/cpu_sun4i.h
+++ b/arch/arm/include/asm/arch-sunxi/cpu_sun4i.h
@@ -11,7 +11,18 @@
 #define SUNXI_SRAM_A1_BASE		0x00000000
 #define SUNXI_SRAM_A1_SIZE		(16 * 1024)	/* 16 kiB */
 
+#if defined(CONFIG_SUNXI_GEN_SUN6I) && \
+    !defined(CONFIG_MACH_SUN8I_R40) && \
+    !defined(CONFIG_MACH_SUN8I_V3S)
+#define SUNXI_SRAM_A2_BASE		0x00040000
+#ifdef CONFIG_MACH_SUN8I_H3
+#define SUNXI_SRAM_A2_SIZE		(48 * 1024)	/* 16+32 kiB */
+#else
+#define SUNXI_SRAM_A2_SIZE		(80 * 1024)	/* 16+64 kiB */
+#endif
+#else
 #define SUNXI_SRAM_A2_BASE		0x00004000	/* 16 kiB */
+#endif
 #define SUNXI_SRAM_A3_BASE		0x00008000	/* 13 kiB */
 #define SUNXI_SRAM_A4_BASE		0x0000b400	/* 3 kiB */
 #define SUNXI_SRAM_D_BASE		0x00010000	/* 4 kiB */
diff --git a/board/sunxi/board.c b/board/sunxi/board.c
index 67acc01d83..1a46100e40 100644
--- a/board/sunxi/board.c
+++ b/board/sunxi/board.c
@@ -636,6 +636,20 @@ int board_mmc_init(struct bd_info *bis)
 
 	return 0;
 }
+
+#if CONFIG_MMC_SUNXI_SLOT_EXTRA != -1
+int mmc_get_env_dev(void)
+{
+	switch (sunxi_get_boot_device()) {
+	case BOOT_DEVICE_MMC1:
+		return 0;
+	case BOOT_DEVICE_MMC2:
+		return 1;
+	default:
+		return CONFIG_SYS_MMC_ENV_DEV;
+	}
+}
+#endif
 #endif
 
 #ifdef CONFIG_SPL_BUILD
diff --git a/env/Kconfig b/env/Kconfig
index 691f4d480c..67ff172e3a 100644
--- a/env/Kconfig
+++ b/env/Kconfig
@@ -446,8 +446,7 @@ config ENV_FAT_DEVICE_AND_PART
 	depends on ENV_IS_IN_FAT
 	default "0:1" if TI_COMMON_CMD_OPTIONS
 	default "0:auto" if ARCH_ZYNQ || ARCH_ZYNQMP || ARCH_VERSAL
-	default "0:auto" if ARCH_SUNXI && MMC_SUNXI_SLOT_EXTRA = -1
-	default "1:auto" if ARCH_SUNXI && MMC_SUNXI_SLOT_EXTRA != -1
+	default ":auto" if ARCH_SUNXI
 	default "0" if ARCH_AT91
 	help
 	  Define this to a string to specify the partition of the device. It can
diff --git a/include/configs/sun8i.h b/include/configs/sun8i.h
index 9b4675e4c3..27c9808a49 100644
--- a/include/configs/sun8i.h
+++ b/include/configs/sun8i.h
@@ -12,6 +12,16 @@
  * A23 specific configuration
  */
 
+#ifdef SUNXI_SRAM_A2_SIZE
+/*
+ * If the SoC has enough SRAM A2, use that for the secure monitor.
+ * Skip the first 16 KiB of SRAM A2, which is not usable, as only certain bytes
+ * are writable. Reserve the last 17 KiB for the resume shim and SCP firmware.
+ */
+#define CONFIG_ARMV7_SECURE_BASE	(SUNXI_SRAM_A2_BASE + 16 * 1024)
+#define CONFIG_ARMV7_SECURE_MAX_SIZE	(SUNXI_SRAM_A2_SIZE - 33 * 1024)
+#endif
+
 /*
  * Include common sunxi configuration where most the settings are
  */