Hi Neha, On Mon, 29 Jul 2024 at 22:44, Neha Malcom Francis <n-fran...@ti.com> wrote: > > Hi Simon > > On 20/07/24 16:19, Simon Glass wrote: > > FIT provides a way to select between different devicetree blobs > > depending on the model. This works fine for U-Boot proper and allows SPL > > to select the correct blob for the current board at runtime. The boot > > sequence (SPL->U-Boot proper) is therefore covered by the existing > > feature set. > > > > The first boot phase (typically TPL) cannot use FIT since SoC boot ROMs > > don't currently support it. Therefore the TPL image must be specific to > > each model it boots on. > > > > To support booting on mulitple models, binman must therefore produce a > > separate TPL image for each model, even if the images for the rest of > > the phases are identical. > > > > TPL needs to be packaged as an executable binary along with a reduced > > devicetree. When multiple models are supported, a reduced devicetree > > must be provided for each model. > > > > U-Boot's build system is designed to build a single devicetree for SPL > > builds, so does not support this requirement. > > > > Add a new 'alternatives' feature to Binman, allowing it to automatically > > subset a devicetree to produce the reduced devicetree for a particular > > phase for each supported model. With this it is possible to produce a > > separate TPL image for each of the models. The correct one can then be > > loaded onto a board, along with the common FIT image(s). > > > > Realized I caught up too late to this thread, and it's already pulled in, > anyways thanks for the effort this was needed.
Thanks for looking through it...we'll see how it goes and what adjustments are needed. Regards, Simon
