Has anyone build an SPL+U-Boot loading system on the TWR-LS1021A (or similar) boards? I would like to have an extremely small "preboot" loader which loads from a QSPI flash, then the "real" bootloader (i.e. U-Boot) which follows.
I have played with the configuration options when building U-Boot, but I cannot get a QSPI Flash build without compiler errors. If I try to build some other configuration (i.e. SD Card, NAND), I can get them to build (that is, I see the SPL binary), but it's not usable for me since I need QPSI flash.
I've not found much information about how SPL works in general, so any info about that would help, too.