TPL builds today don't need to call into firmware or set up the MMU (if this changes, it should be controlled through a config option whether to include this or not), but include the needed support code for this anyway. By moving these unused low-level functions into seperate function-sections, the linker can garbage-collect the unused sections.
Note that (if DM support is enabled), there will be a call to the cache-flushing code from alloc_priv(...) in drivers/core/device.c. This then add 52 bytes of binary size (an increase from 20589 to 20641 bytes) compared to completely removing this code.
Even for a feature-rich TPL (including DM support as for the RK3368), this equates to a size difference of significantly more than 10% in TPL binary size.
Signed-off-by: Philipp Tomsich philipp.tomsich@theobroma-systems.com Reviewed-by: Simon Glass sjg@chromium.org
Changes in v4:
- removes spurious change to Makefile
Changes in v3:
- change to use function-sections (instead of disabling at the Makefile-level for TPL builds) per Tom's suggestion
Changes in v2: None
arch/arm/cpu/armv8/cache.S | 22 ++++++++++++++++++++++ arch/arm/cpu/armv8/tlb.S | 4 +++- arch/arm/cpu/armv8/transition.S | 6 ++++++ 3 files changed, 31 insertions(+), 1 deletion(-)
Applied to u-boot-rockchip, thanks!