Hi Simon, hi Ryder, i tried Patches so far, they are working well https://patchwork.ozlabs.org/patch/992398/ here my github-repo with steps to build: https://github.com/frank-w/u-boot there is a build.sh, which compiles uboot the common way with some additions like bootmenu and full environment to load a kernel on BPI-R2 here are instructions how to prepare SD-Card for boot-up: https://www.fw-web.de/dokuwiki/doku.php?id=en:bpi-r2:storage#extended_boot-h... as you see you need 3 Headers on SD-Card (SDMMC_BOOT, BRLYT, Preloader) and the uboot.bin for SD-Card. on emmc imho preloader in boot0-block and uboot on main-Partition is enough for uboot to boot Source: https://www.fw-web.de/dokuwiki/doku.php?id=en:bpi-r2:uboot#update_uboot btw. @ryder.lee you have a small typo in the readme: Boorom => Bootrom (2 times)
maybe you can add Infos above from my wiki. Btw. how far is the ethernet-driver? then i can replace my 2014-uboot ;) regards Frank