This needs more explanation. What sort of image am I supposed to
get
when I build "P5040DS_NAND"? Where is the PBI?
[S.H] there is already a readme for p3041/p5020/p4080 (doc/README.pblimage), With the PBL tool, we will get a ramboot image "u-boot.pbl". and also the PBI, it is shared by P3/P4/P5.
The question is how is the user to know that something called "pblimage" is relevant to booting from NAND on P5040? Maybe a README.corenet_ds (or board/freescale/corenet_ds/README), that points to README.pblimage?
[S.H] Yes. A README for corenet_ds board will be more useful, then a ramboot section points to README.pblimage.
You don't even update strings like "P3041/P5020" in README.pblimage to include P5040. :-)
[S.H] Thanks for pointing it out. I will update the README.pblimage in next version.
Why is P4080 excluded, BTW? I realize that P4080DS
doesn't have NAND, but the file talks about chips, not boards.
[S.H] there is no P4080DS_NAND entry in boards.cfg...
What is the long-term plan for fixing the problem of the
environment not
being available until after relocation? With SPL we could use CONFIG_NAND_ENV_DST (which has some issues, but they're fixable).
[S.H] this will need export some NAND read APIs (like load ENV stuff from CONFIG_NAND_ENV_DST), then they can be reused before relocation even not using SPL. Please suggest.
The full NAND subsystem will not work before relocation. Your options are to either use SPL (note that you'll have no 4K limitation in this case, so you can do SPD DDR init), or make the SPL code available in non- SPL context somehow. I think the former would be easier.
[S.H] Thanks. I will assess the effort base on my case.
It would also be nice to include instructions for configuring the
board
to boot from NAND in a README
[S.H] This exist in the above readme.
I only see hardware switch settings. Is there no way to soft-boot into NAND (similar to using "pixis/qixis altbank" to boot into an alternate NOR bank)? Our e500v2-based boards have been able to do this...
[S.H] we do have these soft-boot instructions for corenet_ds board. And yes, they should go in README of corenet_ds board, but seems we don't have such a README.
Best Regards, Shaohui Xie