Baremetal examples which uses u-boot doesnt work

For the Arrow SoCkit I always start with the GSRD design found on rocketboards.org as well. That works for me. In theory, it should be possible to start from scratch and make a project that will work with the SocKit. I've tried it a bit and didn't get anywhere. If I have time I'd like to have another try at some point. I think that the only differences are the SDRAM settings and what HPS devices are brought out and what pins they are connected to.

I've used the GSRD preloader to load applications other than UBOOT. As long as you create a correctly formed image and update the SD card it will load. Mine ran slower because it doesn't initialize like UBOOT/linux does. But that didn't matter in what I was doing. I haven't looked into what UBOOT/linux do to speed up processing that I could duplicate in a standalone app.