On 01/03/2018 10:56 AM, Tom Rini wrote:
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.
I talked to Catalin Marinas (one of the arch/arm64 maintainers) on IRC
and he said he didn't see any issue with this approach.
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