arm: Kconfig: Explain TFABOOT
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>
Reviewed-by: Tom Rini <trini@konsulko.com>
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index abbc89a..2e08e99 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -1801,8 +1801,13 @@
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"