And, upstream U-Boot now contains integration tests for N900 which are run as part of the U-Boot CI pipeline. Integreation tests start u-boot in qemu n900 and check that built u-boot can correctly boot kernel from various locations (attached/RAM, onenand, eMMC) with various bootmenu settings. So it should be in good shape as CI pipeline would alert u-boot developers if qemu n900 is unable to start u-boot.