Helios64 uBoot pulled to v2026.01-rc5. Boots.

  - Switched to the binman-atf-mainline scenario with the same rkbin DDR blob
    rk3399_ddr_933MHz_v1.25.bin (TPL blob, as in the old working loader). DRAM init is correct, full
    4 GB visible, Linux boots.
  - U-Boot and DTS updated to v2026.01-rc5. Added MDIO/PHY node and phy-handle in rk3399-kobol-
    helios64.dts, fixing “mdio node is missing”. Disabled i2s2 in the U-Boot DT to avoid rockchip-
    i2s ... Could not register PCM.
  - boot_targets in U-Boot config shortened (mmc1, scsi0, usb0, pxe, dhcp) to avoid env_buf ... too
    small; however, the last built binary still shows the warning (needs rebuild with the shortened
    list or enlarging the buffer).
  - Boot flow: bootstd scans SD (mmc0) and eMMC (mmc1); SD boot works even without mmc0 in
    boot_targets.
  - Other changes: defconfig has CONFIG_ROCKCHIP_EXTERNAL_TPL=y to use the external DDR blob.

Author: iav

patch/u-boot/v2026.01/board_helios64/dt_upstream_rockchip/rk3399-kobol-helios64.dts

@@ -467,6 +467,7 @@
 };
 
 &gmac {
+	phy-handle = <&rgmii_phy>;
 	assigned-clock-parents = <&clkin_gmac>;
 	assigned-clocks = <&cru SCLK_RMII_SRC>;
 	clock_in_out = "input";
@@ -480,6 +481,16 @@
 	snps,reset-delays-us = <0 10000 50000>;
 	snps,reset-gpio = <&gpio3 RK_PB7 GPIO_ACTIVE_LOW>;
 	status = "okay";
+	mdio {
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		rgmii_phy: ethernet-phy@1 {
+			reg = <1>;
+			rx-internal-delay-ps = <2000>;
+			tx-internal-delay-ps = <2000>;
+		};
+	};
 };
 
 &gpu {
@@ -784,7 +795,7 @@
 
 &i2s2 {
 	#sound-dai-cells = <0>;
-	status = "okay";
+	status = "disabled";
 };
 
 &io_domains {

patch/u-boot/v2026.01/board_helios64/include/configs/helios64.h

@@ -34,11 +34,11 @@
 
 #undef BOOT_TARGET_DEVICES
 #define BOOT_TARGET_DEVICES(func) \
-	BOOT_TARGET_MMC(func) \
-	BOOT_TARGET_USB(func) \
-	BOOT_TARGET_SCSI(func) \
-	BOOT_TARGET_PXE(func) \
-	BOOT_TARGET_DHCP(func)
+	func(MMC, mmc, 1) \
+	func(SCSI, scsi, 0) \
+	func(USB, usb, 0) \
+	func(PXE, pxe, na) \
+	func(DHCP, dhcp, na)
 
 #endif