kernel.bbclass: State riscv required tune_features for Linux

Required:
   rv32ima_zicsr_zifencei
   rv64ima_zicsr_zifencei

See the arch/riscv/Makefile:

riscv-march-$(CONFIG_ARCH_RV32I)	:= rv32ima
riscv-march-$(CONFIG_ARCH_RV64I)	:= rv64ima
riscv-march-$(CONFIG_TOOLCHAIN_NEEDS_EXPLICIT_ZICSR_ZIFENCEI) := $(riscv-march-y)_zicsr_zifencei

(From OE-Core rev: 6fd37774eda090951c48a3d9ad482e53f98b0529)

Signed-off-by: Mark Hatle <mark.hatle@amd.com>
Signed-off-by: Antonin Godard <antonin.godard@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 5 insertions, 1 deletions

diff --git a/meta/classes-recipe/kernel.bbclass b/meta/classes-recipe/kernel.bbclass
index 2d9943c8a0..eb03424dfc 100644
--- a/meta/classes-recipe/kernel.bbclass
+++ b/meta/classes-recipe/kernel.bbclass
@@ -4,10 +4,14 @@
 # SPDX-License-Identifier: MIT
 #
 
-inherit linux-kernel-base kernel-module-split
+inherit linux-kernel-base kernel-module-split features_check
 
 COMPATIBLE_HOST = ".*-linux"
 
+# Linux has a minimum ISA requires on riscv, see arch/riscv/Makefile
+REQUIRED_TUNE_FEATURES:riscv32 = "rv 32 i m a zicsr zifencei"
+REQUIRED_TUNE_FEATURES:riscv64 = "rv 64 i m a zicsr zifencei"
+
 KERNEL_PACKAGE_NAME ??= "kernel"
 KERNEL_DEPLOYSUBDIR ??= "${@ "" if (d.getVar("KERNEL_PACKAGE_NAME") == "kernel") else d.getVar("KERNEL_PACKAGE_NAME") }"