The CONFIG_TFABOOT option is more about what U-Boot DOES NOT need to do than to support some features.
Explain a bit more in the Kconfig help text to avoid misunderstandings.
Signed-off-by: Andre Przywara andre.przywara@arm.com --- arch/arm/Kconfig | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-)
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig index 8ba73680699..88ed3f2344d 100644 --- a/arch/arm/Kconfig +++ b/arch/arm/Kconfig @@ -1797,8 +1797,13 @@ config TFABOOT depends on ARCH_SUPPORT_TFABOOT default n help - Enabling this will make a U-Boot binary that is capable of being - booted via TF-A (Trusted Firmware for Cortex-A). + Some platforms support the setup of secure registers (for instance + for CPU errata handling) or provide secure services like PSCI. + Those services could also be provided by other firmware parts + like TF-A (Trusted Firmware for Cortex-A), in which case U-Boot + does not need to (and cannot) execute this code. + Enabling this option will make a U-Boot binary that is relying + on other firmware layers to provide secure functionality.
config TI_SECURE_DEVICE bool "HS Device Type Support"