Hey Heinrich, On Fri, Jul 28, 2023 at 05:48:31PM +0200, Heinrich Schuchardt wrote: > Add more detail to the description of U-Boot boot phases: > > * describe which steps are optional > * mentions alternative boot flows > > Signed-off-by: Heinrich Schuchardt <heinrich.schucha...@canonical.com> > --- > doc/develop/spl.rst | 13 ++++++++++--- > 1 file changed, 10 insertions(+), 3 deletions(-) > > diff --git a/doc/develop/spl.rst b/doc/develop/spl.rst > index a1515a7b43..5743bdf37c 100644 > --- a/doc/develop/spl.rst > +++ b/doc/develop/spl.rst > @@ -77,10 +77,11 @@ To check whether a feature is enabled, use > CONFIG_IS_ENABLED():: > This checks CONFIG_CLK for the main build, CONFIG_SPL_CLK for the SPL build, > CONFIG_TPL_CLK for the TPL build, etc. > > -U-Boot Phases > -------------- > +U-Boot Boot Phases > +------------------ > > -U-Boot boots through the following phases: > +U-Boot goes through the following boot phases where TPL, VPL, SPL are > optional. > +While many boards use SPL less use TPL.
I think you need to add a comma here after SPL. I had to read this a few times before it made sense to me! > > TPL > Very early init, as tiny as possible. This loads SPL (or VPL if enabled). > @@ -97,6 +98,12 @@ SPL > U-Boot > U-Boot proper, containing the command line and boot logic. > > +Further usages of U-Boot SPL comprise: > + > +* Launching BL31 of ARM Trusted Firmware which invokes main U-Boot as BL33 > +* launching EDK II > +* launching Linux kernel > +* launching RISC-V OpenSBI which invokes main U-Boot > > Checking the boot phase > ----------------------- > -- > 2.40.1 >
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