[PATCH v3 3/6] kernel.bbclass: State riscv required tune_features for Linux

[Mark Hatle <mark.hatle@kernel.crashing.org>]

From: Mark Hatle <mark.hatle@amd.com>

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

Signed-off-by: Mark Hatle <mark.hatle@amd.com>
---
 meta/classes-recipe/kernel.bbclass | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

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") }"
 
-- 
2.34.1