On Wed, Jan 03, 2018 at 10:42:56AM -0700, Stephen Warren wrote: > On 01/03/2018 06:45 AM, Tom Rini wrote: > >On Tue, Jan 02, 2018 at 04:54:21PM -0700, Stephen Warren wrote: > > > >>From: Stephen Warren <swar...@nvidia.com> > >> > >>Allow placing a Linux kernel image header at the start of the U-Boot > >>binary. This is useful since the image header reports the amount of memory > >>(BSS and similar) that U-Boot needs to use, but that isn't part of the > >>binary size. This can be used by the code that loads U-Boot into memory to > >>determine where to load U-Boot, based on other users of memory. > >> > >>Signed-off-by: Stephen Warren <swar...@nvidia.com> > >>--- > >>This series relies (at the very least for diff context) on the previous > >>series I sent Dec 19: ARM: tegra: don't use CONFIG_SPL_TEXT_BASE when no > >>SPL ... ARM: tegra: use CONFIG_SYS_INIT_SP_BSS_OFFSET. > > > >Neat. Are the Linux folks encouraging other projects to re-use this > >header? > > Not that I'm aware of, but mainly because I haven't talked to upstream > kernel people about this at all. I implemented this because in recent > versions of Linux4Tegra, for all 64-bit SoCs, our main CPU EL2/EL1 boot path > is either: > > cboot -> Linux kernel > cboot -> U-Boot -> Linux kernel > > cboot is an NVIDIA binary bootloader. cboot wants to know about BSS/... > usage of the binary it loads, which can be determined from the Linux kernel > image header, but we don't want cboot to take different paths when booting > Linux or U-Boot (or indeed anything at all), so the simplest thing was to > make U-Boot look as identical to a Linux kernel as possible. > > >Is there somewhere we can point to as reference for the format > >for the Kconfig help as well, not just the text? Thanks! > > The Linux kernel file Documentation/arm64/booting.txt does describe the > format. Should I respin and add that filename to the Kconfig text?
Yes, and I feel like it can't hurt to let the arm64 maintainers know too as frankly it's a good idea and more projects should make use of it, so maybe it should be a bit more formally documented (in one of those fancy new rst files?) or something. -- Tom
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