On the kendryte k210, writes to mcounteren result in an illegal instruction exception.
Signed-off-by: Sean Anderson seanga2@gmail.com --- Changes for v2: Moved forward in the patch series
arch/riscv/Kconfig | 3 +++ arch/riscv/cpu/cpu.c | 2 ++ 2 files changed, 5 insertions(+)
diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig index 9a7b0334c2..4f8c62dcff 100644 --- a/arch/riscv/Kconfig +++ b/arch/riscv/Kconfig @@ -226,6 +226,9 @@ config XIP from a NOR flash memory without copying the code to ram. Say yes here if U-Boot boots from flash directly.
+config SYS_RISCV_NOCOUNTER + bool "Disable accesses to the mcounteren CSR" + config STACK_SIZE_SHIFT int default 14 diff --git a/arch/riscv/cpu/cpu.c b/arch/riscv/cpu/cpu.c index e457f6acbf..df9eae663c 100644 --- a/arch/riscv/cpu/cpu.c +++ b/arch/riscv/cpu/cpu.c @@ -89,7 +89,9 @@ int arch_cpu_init_dm(void) * Enable perf counters for cycle, time, * and instret counters only */ +#ifndef CONFIG_SYS_RISCV_NOCOUNTER csr_write(CSR_MCOUNTEREN, GENMASK(2, 0)); +#endif
/* Disable paging */ if (supports_extension('s'))