[PATCH 1/2] configs: Add rock5b_plus-rk3588_defconfig

[Bryan Hinton <bryan@bryanhinton.com>]

Add initial defconfig for the Radxa ROCK 5B+ (RK3588), tested on board
revision 1.2 with 32 GB LPDDR5. This mirrors the existing ROCK 5B baseline
and uses the DTS from U-Boot’s vendored Linux snapshot
(rockchip/rk3588-rock-5b-plus).

Build and test details:
  - U-Boot build: 2026.01-rc1-00232-g0673831a738b-dirty (Nov 04 2025 - 21:18:07 -0600)
  - Toolchain: aarch64-linux-gnu-gcc (GCC) 15.1.0
  - DDR TPL: rkbin/bin/rk35/rk3588_ddr_lp4_2112MHz_lp5_2400MHz_v1.19.bin
  - BL31: rkbin/bin/rk35/rk3588_bl31_v1.51.elf
  - Boot medium: microSD card (U-Boot image written via dd)
  - SoC: RK3588 (8× Cortex-A76/A55)
  - DRAM: 32 GiB LPDDR5 detected
  - eMMC socket present but module not soldered (controller still detected)
  - Verified: SPL → U-Boot prompt
  - `mmc list` shows SD + eMMC controllers
  - USB EHCI/XHCI enumeration works (`usb tree`)
  - Control FDT present (`fdt addr ${fdtcontroladdr}; fdt print / model`)
  - Default environment: `fdtfile=rockchip/rk3588-rock-5b-plus.dtb`

This configuration reuses the ROCK 5B base defconfig with minimal adjustments
and builds from the upstream DTS snapshot. Follow-up patches will enable
NVMe, Ethernet, and saveenv support.

Signed-off-by: Bryan Hinton <bryan@bryanhinton.com>
---
 configs/rock5b_plus-rk3588_defconfig | 118 +++++++++++++++++++++++++++
 1 file changed, 118 insertions(+)
 create mode 100644 configs/rock5b_plus-rk3588_defconfig

diff --git a/configs/rock5b_plus-rk3588_defconfig b/configs/rock5b_plus-rk3588_defconfig
new file mode 100644
index 00000000000..be406180b64
--- /dev/null
+++ b/configs/rock5b_plus-rk3588_defconfig
@@ -0,0 +1,118 @@
+CONFIG_ARM=y
+CONFIG_SKIP_LOWLEVEL_INIT=y
+CONFIG_SYS_HAS_NONCACHED_MEMORY=y
+CONFIG_COUNTER_FREQUENCY=24000000
+CONFIG_ARCH_ROCKCHIP=y
+CONFIG_SF_DEFAULT_SPEED=24000000
+CONFIG_SF_DEFAULT_MODE=0x2000
+CONFIG_ROCKCHIP_RK3588=y
+CONFIG_ROCKCHIP_SPI_IMAGE=y
+CONFIG_SPL_SERIAL=y
+CONFIG_TARGET_ROCK5B_RK3588=y
+CONFIG_SYS_LOAD_ADDR=0xc00800
+CONFIG_SF_DEFAULT_BUS=5
+CONFIG_DEBUG_UART_BASE=0xFEB50000
+CONFIG_DEBUG_UART_CLOCK=24000000
+CONFIG_SPL_SPI_FLASH_SUPPORT=y
+CONFIG_SPL_SPI=y
+CONFIG_PCI=y
+CONFIG_DEBUG_UART=y
+CONFIG_AHCI=y
+CONFIG_FIT=y
+CONFIG_FIT_VERBOSE=y
+CONFIG_SPL_FIT_SIGNATURE=y
+CONFIG_SPL_LOAD_FIT=y
+CONFIG_LEGACY_IMAGE_FORMAT=y
+CONFIG_OF_BOARD_SETUP=y
+# CONFIG_DISPLAY_CPUINFO is not set
+CONFIG_DISPLAY_BOARDINFO_LATE=y
+CONFIG_SPL_MAX_SIZE=0x40000
+# CONFIG_SPL_RAW_IMAGE_SUPPORT is not set
+CONFIG_SPL_SPI_LOAD=y
+CONFIG_SYS_SPI_U_BOOT_OFFS=0x60000
+CONFIG_SPL_ATF=y
+CONFIG_CMD_TCPM=y
+CONFIG_CMD_GPIO=y
+CONFIG_CMD_GPT=y
+CONFIG_CMD_I2C=y
+CONFIG_CMD_MMC=y
+CONFIG_CMD_PCI=y
+CONFIG_CMD_USB=y
+CONFIG_CMD_ROCKUSB=y
+CONFIG_CMD_USB_MASS_STORAGE=y
+# CONFIG_CMD_SETEXPR is not set
+CONFIG_CMD_REGULATOR=y
+# CONFIG_SPL_DOS_PARTITION is not set
+CONFIG_SPL_OF_CONTROL=y
+CONFIG_OF_LIVE=y
+CONFIG_OF_SPL_REMOVE_PROPS="clock-names interrupt-parent assigned-clocks assigned-clock-rates assigned-clock-parents"
+CONFIG_SPL_DM_SEQ_ALIAS=y
+CONFIG_SPL_REGMAP=y
+CONFIG_SPL_SYSCON=y
+CONFIG_AHCI_PCI=y
+CONFIG_DWC_AHCI=y
+CONFIG_SPL_CLK=y
+# CONFIG_USB_FUNCTION_FASTBOOT is not set
+CONFIG_ROCKCHIP_GPIO=y
+CONFIG_SYS_I2C_ROCKCHIP=y
+CONFIG_LED=y
+CONFIG_LED_GPIO=y
+CONFIG_MISC=y
+CONFIG_SUPPORT_EMMC_RPMB=y
+CONFIG_MMC_DW=y
+CONFIG_MMC_DW_ROCKCHIP=y
+CONFIG_MMC_SDHCI=y
+CONFIG_MMC_SDHCI_SDMA=y
+CONFIG_MMC_SDHCI_ROCKCHIP=y
+CONFIG_SPI_FLASH_SFDP_SUPPORT=y
+CONFIG_SPI_FLASH_MACRONIX=y
+CONFIG_SPI_FLASH_XTX=y
+CONFIG_PHYLIB=y
+CONFIG_RTL8169=y
+CONFIG_NVME_PCI=y
+CONFIG_PCIE_DW_ROCKCHIP=y
+CONFIG_PHY_ROCKCHIP_INNO_USB2=y
+CONFIG_PHY_ROCKCHIP_NANENG_COMBOPHY=y
+CONFIG_PHY_ROCKCHIP_USBDP=y
+CONFIG_SPL_PINCTRL=y
+CONFIG_PWM_ROCKCHIP=y
+CONFIG_SPL_RAM=y
+CONFIG_SCSI=y
+CONFIG_BAUDRATE=1500000
+CONFIG_DEBUG_UART_SHIFT=2
+CONFIG_SYS_NS16550_MEM32=y
+CONFIG_ROCKCHIP_SFC=y
+CONFIG_SYSRESET=y
+CONFIG_USB=y
+CONFIG_USB_XHCI_HCD=y
+CONFIG_USB_EHCI_HCD=y
+CONFIG_USB_EHCI_GENERIC=y
+CONFIG_USB_OHCI_HCD=y
+CONFIG_USB_OHCI_GENERIC=y
+CONFIG_USB_DWC3=y
+CONFIG_USB_DWC3_GENERIC=y
+CONFIG_SPL_USB_DWC3_GENERIC=y
+CONFIG_TYPEC_TCPM=y
+CONFIG_TYPEC_FUSB302=y
+CONFIG_USB_HOST_ETHER=y
+CONFIG_USB_ETHER_ASIX=y
+CONFIG_USB_ETHER_ASIX88179=y
+CONFIG_USB_ETHER_LAN75XX=y
+CONFIG_USB_ETHER_LAN78XX=y
+CONFIG_USB_ETHER_MCS7830=y
+CONFIG_USB_ETHER_RTL8152=y
+CONFIG_USB_ETHER_SMSC95XX=y
+CONFIG_USB_GADGET=y
+CONFIG_USB_GADGET_DOWNLOAD=y
+CONFIG_USB_FUNCTION_ROCKUSB=y
+CONFIG_ERRNO_STR=y
+CONFIG_OF_UPSTREAM=y
+CONFIG_OF_SEPARATE=y
+# CONFIG_MULTI_DTB_FIT is not set
+CONFIG_DEFAULT_DEVICE_TREE="rockchip/rk3588-rock-5b-plus"
+CONFIG_OF_LIST="rockchip/rk3588-rock-5b-plus"
+CONFIG_DEFAULT_FDT_FILE="rockchip/rk3588-rock-5b-plus.dtb"
+
+# Minimal first version; follow-ups can add NVMe, Ethernet, saveenv
+# CONFIG_CMD_SAVEENV is not set
+# CONFIG_NVME is not set
-- 
2.51.2