On Wed, Aug 23, 2023 at 10:14:00PM +0200, Pali Rohár wrote: > On Wednesday 23 August 2023 21:57:28 Heinrich Schuchardt wrote: > > +Booting from TPL/SPL > > +==================== > > + > > +The main U-Boot binary may be to large to be loaded directly by the Boot > > ROM. > > +This was the main driver for splitting up U-Boot into multiple boot stages > > with > > +successively larger binaries. > > + > > +U-Boot typically goes through the following boot phases where TPL, VPL, > > and SPL > > +are optional. While many boards use SPL only few use TPL. > > + > > +TPL > > + Very early init, as tiny as possible. This loads SPL (or VPL if > > enabled). > > This is not truth. SPL loads TPL. Or at least it was about year ago for > powerpc plat. > > > +VPL > > + Optional verification step, which can select one of several SPL > > binaries, > > + if A/B verified boot is enabled. Implementation of the VPL logic is > > + work-in-progress. For now it just boots into SPL. > > + > > +SPL > > + Secondary program loader. Sets up SDRAM and loads U-Boot proper. It may > > also > > + load other firmware components. > > SPL initializes NAND then loads TPL from NAND, TPL initialize DDR and then > loads U-Boot.
One of the long standing issues here is that PowerPC is different from everyone else, in terms of terminology here. -- Tom
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