Add Kconfig entries for the C (compressed instructions) and A (atomic instructions) ISA extensions. Only the C ISA extension is selectable. This matches the configuration in Linux.
The Kconfig entries are not used yet. A follow-up patch will select the appropriate compiler flags based on the Kconfig configuration.
Signed-off-by: Lukas Auer lukas.auer@aisec.fraunhofer.de Reviewed-by: Bin Meng bmeng.cn@gmail.com ---
Changes in v4: None Changes in v3: None Changes in v2: - Replace the description of RISCV_ISA_C with that of the Linux kernel, as suggested by Bin Meng
arch/riscv/Kconfig | 11 +++++++++++ 1 file changed, 11 insertions(+)
diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig index b81e0d990a..0de77a75d7 100644 --- a/arch/riscv/Kconfig +++ b/arch/riscv/Kconfig @@ -38,6 +38,17 @@ config ARCH_RV64I
endchoice
+config RISCV_ISA_C + bool "Emit compressed instructions" + default y + help + Adds "C" to the ISA subsets that the toolchain is allowed to emit + when building U-Boot, which results in compressed instructions in the + U-Boot binary. + +config RISCV_ISA_A + def_bool y + config 32BIT bool