CV-Bowen opened a new pull request, #18342:
URL: https://github.com/apache/nuttx/pull/18342
## Summary
This PR fixes the Kconfig dependency issues in the RPMSG subsystem to ensure
proper configuration selection.
**Changes:**
1. **drivers/rpmsg/Kconfig**: Fix dependency chain for RPMSG-related options:
- `RPMSG_ROUTER` now properly selects `RPMSG`
- `RPMSG_VIRTIO_LITE` is now a hidden option (bool without prompt)
- `RPMSG_VIRTIO_IVSHMEM` now selects `RPMSG_VIRTIO_LITE` instead of
depending on it
- Fix `endif` comment for SPI PM timeout (should cover both SPI and
SPI_SLAVE)
2. **arch/sim/Kconfig**: Add new `SIM_RPMSG_VIRTIO` option that selects
`RPMSG_VIRTIO_LITE` for simulator builds
3. **boards/sim/sim/sim/configs**: Update `rpproxy_virtio` and
`rpserver_virtio` defconfigs to enable `SIM_RPMSG_VIRTIO`
## Impact
- **Stability**: No impact - configuration-only changes
- **Compatibility**: No breaking changes
- **Code Quality**: Improves Kconfig organization and dependency handling
## Testing
**Build Verification:**
```bash
# Build sim:rpserver_virtio
cmake -B cmake_out/rpserver_virtio -DBOARD_CONFIG=sim:rpserver_virtio -GNinja
cmake --build cmake_out/rpserver_virtio
# Build sim:rpproxy_virtio
cmake -B cmake_out/rpproxy_virtio -DBOARD_CONFIG=sim:rpproxy_virtio -GNinja
cmake --build cmake_out/rpproxy_virtio
```
Test Log:
```
❯ cmake_out/sim_server_virtio/nuttx
NuttShell (NSH) NuttX-12.12.0
server>
server>
server> cu
NuttShell (NSH) NuttX-12.12.0
proxy>
proxy>
proxy>
proxy> ps
TID PID PPID PRI POLICY TYPE NPX STATE EVENT SIGMASK
STACK COMMAND
0 0 3 0 FIFO Kthread - Ready
0000000000000000 0069584 Idle_Task
1 0 3 224 FIFO Kthread - Waiting Semaphore
0000000000000000 0067456 sim_loop_wq 0x764146c003b0 0x764146c00430
2 0 3 224 FIFO Kthread - Waiting Semaphore
0000000000000000 0067472 hpwork 0x400aa0e0 0x400aa160
3 3 0 100 FIFO Task - Running
0000000000000000 0067496 nsh_main
4 0 3 224 FIFO Kthread - Waiting Semaphore
0000000000000000 0067448 rpmsg_virtio server 0x764146c355c8
proxy>
proxy> uname -a
NuttX proxy 12.12.0 d066538db9e-dirty Feb 3 2026 21:47:51 sim sim
proxy> server>
server> uname -a
NuttX server 12.12.0 d066538db9e-dirty Feb 3 2026 21:47:40 sim sim
server> rpmsg ping all 1 1 1 1
[ 23.420000] [server] ping times: 1
[ 23.420000] [server] buffer_len: 2032, send_len: 17
[ 23.420000] [server] avg: 0 s, 10165743 ns
[ 23.420000] [server] min: 0 s, 10165743 ns
[ 23.420000] [server] max: 0 s, 10165743 ns
[ 23.420000] [server] rate: 0.013378 Mbits/sec
server>
server> poweroff
```
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