Originally Posted by h1uke
AFAIU, bist stands for "BuiltInSystemTest". I'd prefer to avoid running that.
... but, in fact, you're running it (I mean, bist U-Boot) on every PW reboot bist
is just a "codename" for "big", "full-featured" U-Boot, which cannot fit into OCRAM and should be loaded by first-stage, "small" U-Boot. (Read a bit more here
With executing bist fastboot
you're just saving fastboot
argument for second-stage ("bist") U-Boot in memory and loading that second-stage U-Boot.