[PATCH] riscv: dts: spacemit: k3: Add Ziccrse extension for X100 cores

[Guodong Xu]

On Tue, May 26, 2026 at 3:23 PM Guodong Xu <guodong at riscstar.com> wrote:
>
> Add the Ziccrse ISA extension to all eight X100 cores. Ziccrse
> provides a forward progress guarantee on LR/SC sequences in main
> memory regions with cacheability and coherence PMAs.
>
> The SpacemiT X100 core supports it per the SpacemiT K3 hardware
> specification.

For the record, I have tested this change on SpacemiT K3 Pico-ITX.

The stress test is run by enabling CONFIG_LOCK_TORTURE_TEST=y then
boots the kernel with:

  locktorture.torture_type=spin_lock locktorture.nwriters_stress=16

driving all 8 harts. It survived sustained torture [ran for ~10 minutes]
with 0 Fail.

... ...
[  735.588947] torture_spin_lock_write_delay: delay = 25 jiffies.
[  738.015096] torture_spin_lock_write_delay: delay = 25 jiffies.
[  739.204713] torture_spin_lock_write_delay: delay = 25 jiffies.
[  741.195211] Writes:  Total: 714319420  Max/Min: 45946599/43679876   Fail: 0

Thanks,
Guodong / docularxu
docularxu at outlook.com

>
> Signed-off-by: Guodong Xu <guodong at riscstar.com>
> ---
>  arch/riscv/boot/dts/spacemit/k3.dtsi | 16 ++++++++--------
>  1 file changed, 8 insertions(+), 8 deletions(-)
>
> diff --git a/arch/riscv/boot/dts/spacemit/k3.dtsi b/arch/riscv/boot/dts/spacemit/k3.dtsi