riscv: support building double-float modules
The riscv32 toolchain for GCC-12 provided by kernel.org contains libgcc.a
compiled for double-float. To link to it we have to adjust how we build
U-Boot.
As U-Boot actually does not use floating point at all this should not
make a significant difference for the produced binaries.
Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
Reviewed-by: Rick Chen <rick@andestech.com>
Reviewed-by: Leo Yu-Chi Liang <ycliang@andestech.com>
diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
index 32a90b8..8f95781 100644
--- a/arch/riscv/Kconfig
+++ b/arch/riscv/Kconfig
@@ -152,6 +152,21 @@
when building U-Boot, which results in compressed instructions in the
U-Boot binary.
+config RISCV_ISA_F
+ bool "Standard extension for Single-Precision Floating Point"
+ default y
+ help
+ Adds "F" to the ISA string passed to the compiler.
+
+config RISCV_ISA_D
+ bool "Standard extension for Double-Precision Floating Point"
+ depends on RISCV_ISA_F
+ default y
+ help
+ Adds "D" to the ISA string passed to the compiler and changes the
+ riscv32 ABI from ilp32 to ilp32d and the riscv64 ABI from lp64 to
+ lp64d.
+
config RISCV_ISA_A
def_bool y