[MrTonyD]

A couple of times I wrote bootloaders for new chips. I relied heavily on the chip vendors documentation. It was usually almost non-existent, and no more than text saying what things I had to do in what sequence. But taking that info, then looking at other bootloaders for operating systems (to see if there was environment specific things I should be considering) I was able to create boot loaders.

[Shanedora]

Was this part of the datasheet of the chip? Perhaps I've missed this section but I've never recalled the datasheet including this information. Is this usually covered in a separate application note or whitepaper?

[MrTonyD]

It could be anyplace. You might try calling the vendor and asking to speak with one of their Application Engineers. Their job is to encourage chip adoption, so they will usually take such calls if you tell them you are doing a new implementation on their chip.