rk3308: pin fdt/ramdisk load addresses for v2026.07 (fix booti FDT)

With u-boot bumped to v2026.07, the board boots far enough to load kernel+initrd
+dtb but booti aborts: "Could not find a valid device tree". The new u-boot's
default load addresses are tighter — the ~38MB kernel Image overlaps and clobbers
the dtb at fdt_addr_r=0x01f00000 before booti reads it.

Confirmed on hardware (rockpi-s, u-boot console): relocating fdt_addr_r=0x08000000
and ramdisk_addr_r=0x0a000000 (both clear of the kernel, both within 256MB) boots
cleanly. Pin them via armbianEnv.txt, which boot.cmd env-imports before loading
the dtb/ramdisk. Applied to both rk3308 boards (rockpi-s, rock-s0).

Signed-off-by: Igor Pecovnik <igor@armbian.com>

Author: igorpecovnik

config/boards/rock-s0.conf

@@ -46,5 +46,12 @@ function pre_install_kernel_debs__enforce_cma() {
 	display_alert "$BOARD" "set CMA size to 16MB due to small DRAM size"
 	run_host_command_logged echo "extraargs=cma=16M" ">>" "${SDCARD}"/boot/armbianEnv.txt
 
+	# u-boot v2026.07's default load addresses overlap on this small (256MB) rk3308
+	# board: the ~38MB kernel Image clobbers the dtb at fdt_addr_r=0x01f00000, so booti
+	# aborts with "Could not find a valid device tree". Pin fdt + ramdisk clear of the
+	# kernel and within 256MB (boot.cmd env-imports armbianEnv.txt before it loads them).
+	run_host_command_logged echo "fdt_addr_r=0x08000000" ">>" "${SDCARD}"/boot/armbianEnv.txt
+	run_host_command_logged echo "ramdisk_addr_r=0x0a000000" ">>" "${SDCARD}"/boot/armbianEnv.txt
+
 	return 0
 }

config/boards/rockpi-s.conf

@@ -47,5 +47,12 @@ function pre_install_kernel_debs__enforce_cma() {
 	display_alert "$BOARD" "set CMA size to 16MB due to small DRAM size"
 	run_host_command_logged echo "extraargs=cma=16M" ">>" "${SDCARD}"/boot/armbianEnv.txt
 
+	# u-boot v2026.07's default load addresses overlap on this small (256MB) rk3308
+	# board: the ~38MB kernel Image clobbers the dtb at fdt_addr_r=0x01f00000, so booti
+	# aborts with "Could not find a valid device tree". Pin fdt + ramdisk clear of the
+	# kernel and within 256MB (boot.cmd env-imports armbianEnv.txt before it loads them).
+	run_host_command_logged echo "fdt_addr_r=0x08000000" ">>" "${SDCARD}"/boot/armbianEnv.txt
+	run_host_command_logged echo "ramdisk_addr_r=0x0a000000" ">>" "${SDCARD}"/boot/armbianEnv.txt
+
 	return 0
 }