diff --git a/board/phytec/common/am6_som_detection.h b/board/phytec/common/am6_som_detection.h
index 032f9da3aab..c5c6e179da6 100644
--- a/board/phytec/common/am6_som_detection.h
+++ b/board/phytec/common/am6_som_detection.h
@@ -9,11 +9,19 @@
 
 #include "phytec_som_detection.h"
 
+#define EEPROM_ADDR				0x50
 #define PHYTEC_AM62X_SOM			71
 #define PHYTEC_AM64X_SOM			72
 #define PHYTEC_EEPROM_VALUE_X			0x21
 #define PHYTEC_EEPROM_NOR_FLASH_64MB_QSPI	0xC
 
+enum {
+	EEPROM_RAM_SIZE_512MB = 0,
+	EEPROM_RAM_SIZE_1GB = 1,
+	EEPROM_RAM_SIZE_2GB = 2,
+	EEPROM_RAM_SIZE_4GB = 4
+};
+
 int __maybe_unused phytec_am6_detect(struct phytec_eeprom_data *data);
 u8 __maybe_unused phytec_get_am6_ddr_size(struct phytec_eeprom_data *data);
 u8 __maybe_unused phytec_get_am6_spi(struct phytec_eeprom_data *data);
diff --git a/board/phytec/phycore_am62x/Kconfig b/board/phytec/phycore_am62x/Kconfig
index 1de8850c6c4..7c179ef0078 100644
--- a/board/phytec/phycore_am62x/Kconfig
+++ b/board/phytec/phycore_am62x/Kconfig
@@ -35,3 +35,33 @@ config SPL_LDSCRIPT
 source "board/phytec/common/Kconfig"
 
 endif
+
+config PHYCORE_AM62X_RAM_SIZE_FIX
+        bool "Set phyCORE-AM62x RAM size fix instead of detecting"
+        default false
+        help
+          RAM size is automatic being detected with the help of
+          the EEPROM introspection data. Set RAM size to a fix value
+          instead.
+
+choice
+        prompt "phyCORE-AM62x RAM size"
+        depends on PHYCORE_AM62X_RAM_SIZE_FIX
+        default PHYCORE_AM62X_RAM_SIZE_2GB
+
+config PHYCORE_AM62X_RAM_SIZE_1GB
+        bool "1GB RAM"
+        help
+          Set RAM size fix to 1GB for phyCORE-AM62x.
+
+config PHYCORE_AM62X_RAM_SIZE_2GB
+        bool "2GB RAM"
+        help
+          Set RAM size fix to 2GB for phyCORE-AM62x.
+
+config PHYCORE_AM62X_RAM_SIZE_4GB
+        bool "4GB RAM"
+        help
+          Set RAM size fix to 4GB for phyCORE-AM62x.
+
+endchoice
diff --git a/board/phytec/phycore_am62x/phycore-am62x.c b/board/phytec/phycore_am62x/phycore-am62x.c
index a082b886bda..4a76f1343d7 100644
--- a/board/phytec/phycore_am62x/phycore-am62x.c
+++ b/board/phytec/phycore_am62x/phycore-am62x.c
@@ -8,6 +8,13 @@
 #include <spl.h>
 #include <fdt_support.h>
 
+#include "phycore-ddr-data.h"
+#include "../common/k3/k3_ddrss_patch.h"
+#include "../common/am6_som_detection.h"
+
+#define AM64_DDRSS_SS_BASE	0x0F300000
+#define DDRSS_V2A_CTL_REG	0x0020
+
 DECLARE_GLOBAL_DATA_PTR;
 
 int board_init(void)
@@ -15,16 +22,157 @@ int board_init(void)
 	return 0;
 }
 
+static u8 phytec_get_am62_ddr_size_default(void)
+{
+	int ret;
+	struct phytec_eeprom_data data;
+
+	if (IS_ENABLED(CONFIG_PHYCORE_AM62X_RAM_SIZE_FIX)) {
+		if (IS_ENABLED(CONFIG_PHYCORE_AM62X_RAM_SIZE_1GB))
+			return EEPROM_RAM_SIZE_1GB;
+		else if (IS_ENABLED(CONFIG_PHYCORE_AM62X_RAM_SIZE_2GB))
+			return EEPROM_RAM_SIZE_2GB;
+		else if (IS_ENABLED(CONFIG_PHYCORE_AM62X_RAM_SIZE_4GB))
+			return EEPROM_RAM_SIZE_4GB;
+	}
+
+	ret = phytec_eeprom_data_setup(&data, 0, EEPROM_ADDR);
+	if (!ret && data.valid)
+		return phytec_get_am6_ddr_size(&data);
+
+	/* Default DDR size is 2GB */
+	return EEPROM_RAM_SIZE_2GB;
+}
+
 int dram_init(void)
 {
-	return fdtdec_setup_mem_size_base();
+	u8 ram_size = phytec_get_am62_ddr_size_default();
+
+	/*
+	 * HACK: ddrss driver support 2GB RAM by default
+	 * V2A_CTL_REG should be updated to support other RAM size
+	 */
+	if (IS_ENABLED(CONFIG_K3_AM64_DDRSS))
+		if (ram_size == EEPROM_RAM_SIZE_4GB)
+			writel(0x00000210, AM64_DDRSS_SS_BASE + DDRSS_V2A_CTL_REG);
+
+	switch (ram_size) {
+	case EEPROM_RAM_SIZE_1GB:
+		gd->ram_size = 0x40000000;
+		break;
+	case EEPROM_RAM_SIZE_2GB:
+		gd->ram_size = 0x80000000;
+		break;
+	case EEPROM_RAM_SIZE_4GB:
+#ifdef CONFIG_PHYS_64BIT
+		gd->ram_size = 0x100000000;
+#else
+		gd->ram_size = 0x80000000;
+#endif
+		break;
+	default:
+		gd->ram_size = 0x80000000;
+	}
+
+	return 0;
+}
+
+phys_size_t board_get_usable_ram_top(phys_size_t total_size)
+{
+#ifdef CONFIG_PHYS_64BIT
+	/* Limit RAM used by U-Boot to the DDR low region */
+	if (gd->ram_top > 0x100000000)
+		return 0x100000000;
+#endif
+	return gd->ram_top;
 }
 
 int dram_init_banksize(void)
 {
-	return fdtdec_setup_memory_banksize();
+	u8 ram_size;
+
+	ram_size = phytec_get_am62_ddr_size_default();
+	switch (ram_size) {
+	case EEPROM_RAM_SIZE_1GB:
+		gd->bd->bi_dram[0].start = CFG_SYS_SDRAM_BASE;
+		gd->bd->bi_dram[0].size = 0x40000000;
+		gd->ram_size = 0x40000000;
+		break;
+
+	case EEPROM_RAM_SIZE_2GB:
+		gd->bd->bi_dram[0].start = CFG_SYS_SDRAM_BASE;
+		gd->bd->bi_dram[0].size = 0x80000000;
+		gd->ram_size = 0x80000000;
+		break;
+
+	case EEPROM_RAM_SIZE_4GB:
+		/* Bank 0 declares the memory available in the DDR low region */
+		gd->bd->bi_dram[0].start = CFG_SYS_SDRAM_BASE;
+		gd->bd->bi_dram[0].size = 0x80000000;
+		gd->ram_size = 0x80000000;
+
+#ifdef CONFIG_PHYS_64BIT
+		/* Bank 1 declares the memory available in the DDR upper region */
+		gd->bd->bi_dram[1].start = 0x880000000;
+		gd->bd->bi_dram[1].size = 0x80000000;
+		gd->ram_size = 0x100000000;
+#endif
+		break;
+	default:
+		/* Continue with default 2GB setup */
+		gd->bd->bi_dram[0].start = CFG_SYS_SDRAM_BASE;
+		gd->bd->bi_dram[0].size = 0x80000000;
+		gd->ram_size = 0x80000000;
+		printf("DDR size %d is not supported\n", ram_size);
+	}
+
+	return 0;
+}
+
+#if defined(CONFIG_K3_DDRSS)
+int update_ddrss_timings(void)
+{
+	int ret;
+	u8 ram_size;
+	struct ddrss *ddr_patch = NULL;
+	void *fdt = (void *)gd->fdt_blob;
+
+	ram_size = phytec_get_am62_ddr_size_default();
+	switch (ram_size) {
+	case EEPROM_RAM_SIZE_1GB:
+		ddr_patch = &phycore_ddrss_data[PHYCORE_1GB];
+		break;
+	case EEPROM_RAM_SIZE_2GB:
+		ddr_patch = NULL;
+		break;
+	case EEPROM_RAM_SIZE_4GB:
+		ddr_patch = &phycore_ddrss_data[PHYCORE_4GB];
+		break;
+	default:
+		break;
+	}
+
+	/* Nothing to patch */
+	if (!ddr_patch)
+		return 0;
+
+	debug("Applying DDRSS timings patch for ram_size %d\n", ram_size);
+
+	ret = fdt_apply_ddrss_timings_patch(fdt, ddr_patch);
+	if (ret < 0) {
+		printf("Failed to apply ddrs timings patch %d\n", ret);
+		return ret;
+	}
+
+	return 0;
 }
 
+int do_board_detect(void)
+{
+	return update_ddrss_timings();
+}
+#endif
+
 #define CTRLMMR_USB0_PHY_CTRL   0x43004008
 #define CTRLMMR_USB1_PHY_CTRL   0x43004018
 #define CORE_VOLTAGE            0x80000000
diff --git a/board/phytec/phycore_am62x/phycore-ddr-data.h b/board/phytec/phycore_am62x/phycore-ddr-data.h
new file mode 100644
index 00000000000..fe6eccd959e
--- /dev/null
+++ b/board/phytec/phycore_am62x/phycore-ddr-data.h
@@ -0,0 +1,206 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Copyright (C) 2024 PHYTEC Messtechnik GmbH
+ * Author: Wadim Egorov <w.egorov@phytec.de>
+ */
+
+#ifndef PHYCORE_DDR_DATA
+#define PHYCORE_DDR_DATA
+
+#include "../common/k3/k3_ddrss_patch.h"
+
+/* 1 GB variant delta */
+struct ddr_reg ddr_1gb_ctl_regs[] = {
+	{ 55, 0x0400DB60 },
+	{ 58, 0x0400DB60 },
+	{ 61, 0x0400DB60 },
+	{ 73, 0x00001860 },
+	{ 75, 0x00001860 },
+	{ 77, 0x00001860 },
+	{ 119, 0x00061800 },
+	{ 120, 0x00061800 },
+	{ 121, 0x00061800 },
+	{ 122, 0x00061800 },
+	{ 123, 0x00061800 },
+	{ 125, 0x0000AAA0 },
+	{ 126, 0x00061800 },
+	{ 127, 0x00061800 },
+	{ 128, 0x00061800 },
+	{ 129, 0x00061800 },
+	{ 130, 0x00061800 },
+	{ 132, 0x0000AAA0 },
+	{ 133, 0x00061800 },
+	{ 134, 0x00061800 },
+	{ 135, 0x00061800 },
+	{ 136, 0x00061800 },
+	{ 137, 0x00061800 },
+	{ 139, 0x0000AAA0 },
+	{ 206, 0x00000000 },
+	{ 209, 0x00000000 },
+	{ 212, 0x00000000 },
+	{ 215, 0x00000000 },
+	{ 218, 0x00000000 },
+	{ 221, 0x00000000 },
+	{ 230, 0x00000000 },
+	{ 231, 0x00000000 },
+	{ 232, 0x00000000 },
+	{ 233, 0x00000000 },
+	{ 234, 0x00000000 },
+	{ 235, 0x00000000 },
+	{ 316, 0x01010000 },
+	{ 318, 0x3FFF0000 },
+	{ 327, 0x00000C01 },
+	{ 328, 0x00000000 },
+	{ 385, 0x000030C0 },
+	{ 390, 0x0000DB60 },
+	{ 391, 0x0001E780 },
+	{ 394, 0x000030C0 },
+	{ 399, 0x0000DB60 },
+	{ 400, 0x0001E780 },
+	{ 403, 0x000030C0 },
+	{ 408, 0x0000DB60 },
+	{ 409, 0x0001E780 }
+};
+
+struct ddr_reg ddr_1gb_pi_regs[] = {
+	{ 77, 0x04000100 },
+	{ 176, 0x00001860 },
+	{ 178, 0x00001860 },
+	{ 180, 0x04001860 },
+	{ 233, 0x0000C570 },
+	{ 238, 0x0000C570 },
+	{ 243, 0x0000C570 },
+	{ 247, 0x000030C0 },
+	{ 248, 0x0001E780 },
+	{ 249, 0x000030C0 },
+	{ 250, 0x0001E780 },
+	{ 251, 0x000030C0 },
+	{ 252, 0x0001E780 },
+	{ 299, 0x00000000 },
+	{ 301, 0x00000000 },
+	{ 307, 0x00000000 },
+	{ 309, 0x00000000 },
+	{ 315, 0x00000000 },
+	{ 317, 0x00000000 },
+	{ 323, 0x00000000 },
+	{ 325, 0x00000000 },
+	{ 331, 0x00000000 },
+	{ 333, 0x00000000 },
+	{ 339, 0x00000000 },
+	{ 341, 0x00000000 }
+};
+
+struct ddr_reg ddr_1gb_phy_regs[] = {
+	{ 1371, 0x0001F7C2 },
+};
+
+/* 4 GB variant delta */
+struct ddr_reg ddr_4gb_ctl_regs[] = {
+	{ 55, 0x0400DB60 },
+	{ 58, 0x0400DB60 },
+	{ 61, 0x0400DB60 },
+	{ 73, 0x00001860 },
+	{ 75, 0x00001860 },
+	{ 77, 0x00001860 },
+	{ 119, 0x00061800 },
+	{ 120, 0x00061800 },
+	{ 121, 0x00061800 },
+	{ 122, 0x00061800 },
+	{ 123, 0x00061800 },
+	{ 125, 0x0000AAA0 },
+	{ 126, 0x00061800 },
+	{ 127, 0x00061800 },
+	{ 128, 0x00061800 },
+	{ 129, 0x00061800 },
+	{ 130, 0x00061800 },
+	{ 132, 0x0000AAA0 },
+	{ 133, 0x00061800 },
+	{ 134, 0x00061800 },
+	{ 135, 0x00061800 },
+	{ 136, 0x00061800 },
+	{ 137, 0x00061800 },
+	{ 139, 0x0000AAA0 },
+	{ 206, 0x00000000 },
+	{ 209, 0x00000000 },
+	{ 212, 0x00000000 },
+	{ 215, 0x00000000 },
+	{ 218, 0x00000000 },
+	{ 221, 0x00000000 },
+	{ 230, 0x00000000 },
+	{ 231, 0x00000000 },
+	{ 232, 0x00000000 },
+	{ 233, 0x00000000 },
+	{ 234, 0x00000000 },
+	{ 235, 0x00000000 },
+	{ 316, 0x00000000 },
+	{ 318, 0x7FFF0000 },
+	{ 327, 0x01000C01 },
+	{ 328, 0x00000001 },
+	{ 385, 0x000030C0 },
+	{ 390, 0x0000DB60 },
+	{ 391, 0x0001E780 },
+	{ 394, 0x000030C0 },
+	{ 399, 0x0000DB60 },
+	{ 400, 0x0001E780 },
+	{ 403, 0x000030C0 },
+	{ 408, 0x0000DB60 },
+	{ 409, 0x0001E780 }
+};
+
+struct ddr_reg ddr_4gb_pi_regs[] = {
+	{ 77, 0x04000000 },
+	{ 176, 0x00001860 },
+	{ 178, 0x00001860 },
+	{ 180, 0x04001860 },
+	{ 233, 0x0000C570 },
+	{ 238, 0x0000C570 },
+	{ 243, 0x0000C570 },
+	{ 247, 0x000030C0 },
+	{ 248, 0x0001E780 },
+	{ 249, 0x000030C0 },
+	{ 250, 0x0001E780 },
+	{ 251, 0x000030C0 },
+	{ 252, 0x0001E780 },
+	{ 299, 0x00000000 },
+	{ 301, 0x00000000 },
+	{ 307, 0x00000000 },
+	{ 309, 0x00000000 },
+	{ 315, 0x00000000 },
+	{ 317, 0x00000000 },
+	{ 323, 0x00000000 },
+	{ 325, 0x00000000 },
+	{ 331, 0x00000000 },
+	{ 333, 0x00000000 },
+	{ 339, 0x00000000 },
+	{ 341, 0x00000000 }
+};
+
+struct ddr_reg ddr_4gb_phy_regs[] = {
+	{ 1371, 0x0001F7C2 },
+};
+
+enum {
+	PHYCORE_1GB,
+	PHYCORE_4GB,
+};
+
+struct ddrss phycore_ddrss_data[] = {
+	[PHYCORE_1GB] = {
+		.ctl_regs = &ddr_1gb_ctl_regs[0],
+		.ctl_regs_num = ARRAY_SIZE(ddr_1gb_ctl_regs),
+		.pi_regs = &ddr_1gb_pi_regs[0],
+		.pi_regs_num = ARRAY_SIZE(ddr_1gb_pi_regs),
+		.phy_regs = &ddr_1gb_phy_regs[0],
+		.phy_regs_num = ARRAY_SIZE(ddr_1gb_phy_regs),
+	},
+	[PHYCORE_4GB] = {
+		.ctl_regs = &ddr_4gb_ctl_regs[0],
+		.ctl_regs_num = ARRAY_SIZE(ddr_4gb_ctl_regs),
+		.pi_regs = &ddr_4gb_pi_regs[0],
+		.pi_regs_num = ARRAY_SIZE(ddr_4gb_pi_regs),
+		.phy_regs = &ddr_4gb_phy_regs[0],
+		.phy_regs_num = ARRAY_SIZE(ddr_4gb_phy_regs),
+	},
+};
+
+#endif /* PHYCORE_DDR_DATA */
diff --git a/configs/phycore_am62x_a53_defconfig b/configs/phycore_am62x_a53_defconfig
index fd36edc29dd..145887c0286 100644
--- a/configs/phycore_am62x_a53_defconfig
+++ b/configs/phycore_am62x_a53_defconfig
@@ -5,6 +5,7 @@ CONFIG_SPL_LIBCOMMON_SUPPORT=y
 CONFIG_SPL_LIBGENERIC_SUPPORT=y
 CONFIG_NR_DRAM_BANKS=2
 CONFIG_SOC_K3_AM625=y
+CONFIG_PHYTEC_SOM_DETECTION=y
 CONFIG_TARGET_PHYCORE_AM62X_A53=y
 CONFIG_HAS_CUSTOM_SYS_INIT_SP_ADDR=y
 CONFIG_CUSTOM_SYS_INIT_SP_ADDR=0x80b80000
@@ -45,6 +46,7 @@ CONFIG_SYS_MMCSD_RAW_MODE_U_BOOT_USE_SECTOR=y
 CONFIG_SYS_MMCSD_RAW_MODE_U_BOOT_SECTOR=0x1400
 CONFIG_SPL_ENV_SUPPORT=y
 CONFIG_SPL_FS_LOAD_PAYLOAD_NAME="u-boot.img"
+CONFIG_SPL_I2C=y
 CONFIG_SPL_DM_MAILBOX=y
 CONFIG_SPL_DM_SPI_FLASH=y
 CONFIG_SPL_POWER_DOMAIN=y
@@ -73,6 +75,8 @@ CONFIG_CLK_TI_SCI=y
 CONFIG_DMA_CHANNELS=y
 CONFIG_TI_K3_NAVSS_UDMA=y
 CONFIG_TI_SCI_PROTOCOL=y
+CONFIG_DM_I2C=y
+CONFIG_SYS_I2C_OMAP24XX=y
 CONFIG_DM_MAILBOX=y
 CONFIG_K3_SEC_PROXY=y
 CONFIG_SUPPORT_EMMC_BOOT=y
diff --git a/configs/phycore_am62x_r5_defconfig b/configs/phycore_am62x_r5_defconfig
index 389672d5227..0062a4e3569 100644
--- a/configs/phycore_am62x_r5_defconfig
+++ b/configs/phycore_am62x_r5_defconfig
@@ -6,6 +6,7 @@ CONFIG_SPL_LIBCOMMON_SUPPORT=y
 CONFIG_SPL_LIBGENERIC_SUPPORT=y
 CONFIG_NR_DRAM_BANKS=2
 CONFIG_SOC_K3_AM625=y
+CONFIG_PHYTEC_SOM_DETECTION=y
 CONFIG_TARGET_PHYCORE_AM62X_R5=y
 CONFIG_HAS_CUSTOM_SYS_INIT_SP_ADDR=y
 CONFIG_CUSTOM_SYS_INIT_SP_ADDR=0x43c3a7f0
@@ -50,6 +51,7 @@ CONFIG_SPL_SYS_MALLOC_SIZE=0x1000000
 CONFIG_SPL_EARLY_BSS=y
 CONFIG_SYS_MMCSD_RAW_MODE_U_BOOT_USE_SECTOR=y
 CONFIG_SYS_MMCSD_RAW_MODE_U_BOOT_SECTOR=0x400
+CONFIG_SPL_I2C=y
 CONFIG_SPL_DM_MAILBOX=y
 CONFIG_SPL_DM_SPI_FLASH=y
 CONFIG_SPL_DM_RESET=y
@@ -88,6 +90,7 @@ CONFIG_SPL_CLK_K3_PLL=y
 CONFIG_SPL_CLK_K3=y
 CONFIG_TI_SCI_PROTOCOL=y
 CONFIG_DA8XX_GPIO=y
+CONFIG_DM_I2C=y
 CONFIG_DM_MAILBOX=y
 CONFIG_K3_SEC_PROXY=y
 CONFIG_SPL_MISC=y
@@ -129,3 +132,4 @@ CONFIG_SPL_TIMER=y
 CONFIG_OMAP_TIMER=y
 CONFIG_LIB_RATIONAL=y
 CONFIG_SPL_LIB_RATIONAL=y
+CONFIG_SYS_I2C_OMAP24XX=y
