Your ROOT_URL in app.ini is https://src.whiteboxsystems.nl/ but you are visiting http://src.whiteboxsystems.nl/Whitebox/u-boot/src/commit/7a170a59f3b512ccd1d3ce51a1814b60fd1ec7bc/configs/cpu9G20_nand_defconfig You should set ROOT_URL correctly, otherwise the web may not work correctly.
upstream u-boot with additional patches for our devices/boards: https://lists.denx.de/pipermail/u-boot/2017-March/282789.html (AXP crashes) ; Gbit ethernet patch for some LIME2 revisions ; with SPI flash support
 
 
 
 
 
 
u-boot/configs/cpu9G20_nand_defconfig

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CONFIG_SYS_EXTRA_OPTIONS="CPU9G20,NANDBOOT"
CONFIG_ARM=y
CONFIG_ARCH_AT91=y
CONFIG_TARGET_CPU9260=y