Jonas, thank you for your detailed review. The explanations for each of config change recommendations were especially helpful.
As for the CFG_IRAM_BASE / BROM_LAST_BOOTSOURCE issue, I have made a step forward, but expect I will be getting feedback as to a better approach.
Note: This patchset is based on Kever's most recent pull request "u-boot-rockchip-20231007" which, as of this writing, has yet to be merged upstream.
Finally, I would appreciate any insight as to FriendlyElec vs FriendlyARM naming. Currently, I have documented this as the "FriendlyARM NanoPC-T6" but it would seem that it could also be called the "FriendlyElec NanoPC-T6" and be equally correct. It is worth noting that u-boot currently contains support for the "FriendlyARM NanoPi2" board/friendlyarm/nanopi2 and thus my use of FriendlyARM.
Changes in v2: - resync dt from: https://git.kernel.org/pub/scm/linux/kernel/git/mmind/linux-rockchip.git/pla... - config changes: -CONFIG_PCI_INIT_R=y -CONFIG_SYS_SPI_U_BOOT_OFFS=0x100000 +CONFIG_SYS_SPI_U_BOOT_OFFS=0x60000 -CONFIG_REGULATOR_PWM=y -# CONFIG_USB_XHCI_DWC3_OF_SIMPLE is not set -CONFIG_SPL_USB_DWC3_GENERIC=y - added board files: create mode 100644 board/friendlyarm/nanopct6-rk3588/Kconfig create mode 100644 board/friendlyarm/nanopct6-rk3588/MAINTAINERS create mode 100644 board/friendlyarm/nanopct6-rk3588/Makefile create mode 100644 board/friendlyarm/nanopct6-rk3588/nanopct6-rk3588.c create mode 100644 include/configs/nanopct6-rk3588.h - improved BROM_LAST_BOOTSOURCE handling for SPI NOR: if (CONFIG_IS_ENABLED(TARGET_NANOPCT6_RK3588) && bootdevice_brom_id == 4) bootdevice_ofpath = boot_devices[BROM_BOOTSOURCE_SPINOR]; else bootdevice_ofpath = boot_devices[bootdevice_brom_id];