riscv: Make A ISA extension selectable

Make the Atomic (A) ISA extension selectable. Thus CPUs such as
Ibex without the A extension can be supported.

Signed-off-by: Chia-Wei Wang <chiawei_wang@aspeedtech.com>
Reviewed-by: Leo Yu-Chi Liang <ycliang@andestech.com>

diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
index fa3b016..c5859c5 100644 (file)
--- a/arch/riscv/Kconfig
+++ b/arch/riscv/Kconfig
@@ -308,7 +308,10 @@ config TPL_USE_ARCH_STRNCMP
 endmenu
 
 config RISCV_ISA_A
-       def_bool y
+       bool "Standard extension for Atomic Instructions"
+       default y
+       help
+         Adds "A" to the ISA string passed to the compiler.
 
 config DMA_ADDR_T_64BIT
        bool