boards/arm/qemu-armv7a: switch all nsh defconfigs to nxinit entrypoint

Switch every qemu-armv7a defconfig whose init entry point was nsh_main
(6 configs: full, gdbstub, nsh, rpproxy, rpserver, smp) to nxinit
(init_main), matching the esp32p4/esp32s3 boards' existing nxinit
configs. nsh now runs as a "console sh" service started by init.rc
instead of being the top-level init task.

Per defconfig (regenerated with "make savedefconfig"):
- CONFIG_INIT_ENTRYPOINT switched to "init_main"
- CONFIG_INIT_STACKSIZE=8192 (nxinit init task running console-sh)
- CONFIG_SYSTEM_NXINIT=y plus its Kconfig dependencies:
  CONFIG_EXPERIMENTAL, CONFIG_LIBC_EXECFUNCS, CONFIG_SCHED_CHILD_STATUS
  (which depends on CONFIG_SCHED_HAVE_PARENT)
- CONFIG_SYSTEM_NSH_STACKSIZE=8192 (nsh is now a spawned service and
  needs its own stack instead of borrowing the init stack)
- CONFIG_ETC_ROMFS=y / CONFIG_FS_ROMFS=y to ship init.rc via ROMFS
Configs that already set some of these keep them unchanged.

Add boards/arm/qemu/qemu-armv7a/src/etc/init.d/init.rc (registers a
"console sh" service guarded by CONFIG_SYSTEM_NSH; "on init" starts it)
and ship it through ROMFS: the Make build via RCSRCS and CMake via
nuttx_add_romfs(), both gated on CONFIG_ETC_ROMFS && CONFIG_SYSTEM_NXINIT
so non-nxinit configs are unaffected. Omitting this ROMFS plumbing causes
a link-time "undefined reference to romfs_img".

Testing (isolated apache/master clone, arm-none-eabi, qemu-system-arm):
  qemu-armv7a:nsh boot:
    nsh> ps
      TID PID PPID ... COMMAND
        3   3    0 ... init_main
        4   4    3 ... sh
Compile-only checks (exit 0, no errors): smp, rpproxy. Remaining configs
validated via configure + olddefconfig + savedefconfig (Kconfig-valid),
not individually built.

Assisted-by: opencode-agent/claude-opus-4-8
Signed-off-by: wangjianyu3 <wangjianyu3@xiaomi.com>

Author: JianyuWang0623

boards/arm/qemu/qemu-armv7a/configs/full/defconfig

@@ -46,6 +46,7 @@ CONFIG_DRIVERS_VIDEO=y
 CONFIG_DRIVERS_VIRTIO_GPU=y
 CONFIG_DRIVERS_VIRTIO_INPUT=y
 CONFIG_DRIVERS_VIRTIO_MMIO=y
+CONFIG_ETC_ROMFS=y
 CONFIG_EVENT_FD=y
 CONFIG_EXAMPLES_FB=y
 CONFIG_EXAMPLES_HELLO=y
@@ -65,7 +66,8 @@ CONFIG_GRAPHICS_INPUT_TOOL=y
 CONFIG_GRAPHICS_LVGL=y
 CONFIG_HAVE_CXX=y
 CONFIG_IDLETHREAD_STACKSIZE=4096
-CONFIG_INIT_ENTRYPOINT="nsh_main"
+CONFIG_INIT_ENTRYPOINT="init_main"
+CONFIG_INIT_STACKSIZE=8192
 CONFIG_INPUT_MOUSE_WHEEL=y
 CONFIG_INTELHEX_BINARY=y
 CONFIG_INTERPRETERS_LUA=y
@@ -109,6 +111,8 @@ CONFIG_RAM_VSTART=0x40200000
 CONFIG_RAW_BINARY=y
 CONFIG_READLINE_CMD_HISTORY=y
 CONFIG_RR_INTERVAL=200
+CONFIG_SCHED_CHILD_STATUS=y
+CONFIG_SCHED_HAVE_PARENT=y
 CONFIG_SCHED_HPWORKPRIORITY=192
 CONFIG_SCHED_INSTRUMENTATION=y
 CONFIG_SCHED_INSTRUMENTATION_DUMP=y
@@ -128,8 +132,10 @@ CONFIG_SYSTEM_HEXED=y
 CONFIG_SYSTEM_HOSTNAME=y
 CONFIG_SYSTEM_NOTE=y
 CONFIG_SYSTEM_NSH=y
+CONFIG_SYSTEM_NSH_STACKSIZE=8192
 CONFIG_SYSTEM_NXCAMERA=y
 CONFIG_SYSTEM_NXCODEC=y
+CONFIG_SYSTEM_NXINIT=y
 CONFIG_SYSTEM_VI=y
 CONFIG_SYSTEM_YMODEM=y
 CONFIG_SYSTEM_ZMODEM=y

boards/arm/qemu/qemu-armv7a/configs/gdbstub/defconfig

@@ -26,6 +26,7 @@ CONFIG_DEBUG_SCHED_INFO=y
 CONFIG_DEBUG_SCHED_WARN=y
 CONFIG_DEBUG_SYMBOLS=y
 CONFIG_DEFAULT_TASK_STACKSIZE=4096
+CONFIG_ETC_ROMFS=y
 CONFIG_EXAMPLES_HELLO=y
 CONFIG_EXPERIMENTAL=y
 CONFIG_FLASH_SIZE=127926272
@@ -36,7 +37,8 @@ CONFIG_FS_ROMFS=y
 CONFIG_HAVE_CXX=y
 CONFIG_HAVE_CXXINITIALIZE=y
 CONFIG_IDLETHREAD_STACKSIZE=4096
-CONFIG_INIT_ENTRYPOINT="nsh_main"
+CONFIG_INIT_ENTRYPOINT="init_main"
+CONFIG_INIT_STACKSIZE=8192
 CONFIG_INTELHEX_BINARY=y
 CONFIG_LIBC_EXECFUNCS=y
 CONFIG_LIB_GDBSTUB=y
@@ -51,6 +53,8 @@ CONFIG_RAM_VSTART=0x40200000
 CONFIG_RAW_BINARY=y
 CONFIG_READLINE_CMD_HISTORY=y
 CONFIG_RR_INTERVAL=200
+CONFIG_SCHED_CHILD_STATUS=y
+CONFIG_SCHED_HAVE_PARENT=y
 CONFIG_SCHED_HPWORK=y
 CONFIG_SCHED_HPWORKPRIORITY=192
 CONFIG_SERIAL_GDBSTUB=y
@@ -61,6 +65,8 @@ CONFIG_START_MONTH=4
 CONFIG_START_YEAR=2023
 CONFIG_SYMTAB_ORDEREDBYNAME=y
 CONFIG_SYSTEM_NSH=y
+CONFIG_SYSTEM_NSH_STACKSIZE=8192
+CONFIG_SYSTEM_NXINIT=y
 CONFIG_SYSTEM_SYSTEM=y
 CONFIG_TESTING_GETPRIME=y
 CONFIG_TESTING_OSTEST=y

boards/arm/qemu/qemu-armv7a/configs/nsh/defconfig

@@ -26,18 +26,22 @@ CONFIG_DEBUG_FEATURES=y
 CONFIG_DEBUG_FULLOPT=y
 CONFIG_DEBUG_SYMBOLS=y
 CONFIG_DEFAULT_TASK_STACKSIZE=4096
+CONFIG_ETC_ROMFS=y
 CONFIG_EXAMPLES_HELLO=y
 CONFIG_EXPERIMENTAL=y
 CONFIG_FLASH_SIZE=1048576
 CONFIG_FLASH_START=0
 CONFIG_FLASH_VSTART=0
 CONFIG_FS_HOSTFS=y
 CONFIG_FS_PROCFS=y
+CONFIG_FS_ROMFS=y
 CONFIG_FS_TMPFS=y
 CONFIG_HAVE_CXX=y
 CONFIG_HAVE_CXXINITIALIZE=y
 CONFIG_IDLETHREAD_STACKSIZE=4096
-CONFIG_INIT_ENTRYPOINT="nsh_main"
+CONFIG_INIT_ENTRYPOINT="init_main"
+CONFIG_INIT_STACKSIZE=8192
+CONFIG_LIBC_EXECFUNCS=y
 CONFIG_MODULE=y
 CONFIG_NSH_BUILTIN_APPS=y
 CONFIG_NSH_FILEIOSIZE=512
@@ -52,6 +56,7 @@ CONFIG_RAM_VSTART=0x40000000
 CONFIG_RAW_BINARY=y
 CONFIG_READLINE_CMD_HISTORY=y
 CONFIG_RR_INTERVAL=200
+CONFIG_SCHED_CHILD_STATUS=y
 CONFIG_SCHED_HAVE_PARENT=y
 CONFIG_SCHED_HPWORK=y
 CONFIG_SCHED_HPWORKPRIORITY=192
@@ -62,6 +67,8 @@ CONFIG_START_YEAR=2023
 CONFIG_SYMTAB_ORDEREDBYNAME=y
 CONFIG_SYSTEM_GPROF=y
 CONFIG_SYSTEM_NSH=y
+CONFIG_SYSTEM_NSH_STACKSIZE=8192
+CONFIG_SYSTEM_NXINIT=y
 CONFIG_SYSTEM_SYSTEM=y
 CONFIG_TESTING_GETPRIME=y
 CONFIG_TESTING_OSTEST=y

boards/arm/qemu/qemu-armv7a/configs/rpproxy/defconfig

@@ -46,6 +46,7 @@ CONFIG_DRIVERS_VHOST_RNG=y
 CONFIG_DRIVERS_VHOST_RPMSG=y
 CONFIG_DRIVERS_VIRTIO_MMIO=y
 CONFIG_DRIVERS_VIRTIO_SERIAL=y
+CONFIG_ETC_ROMFS=y
 CONFIG_EXAMPLES_HELLO=y
 CONFIG_EXAMPLES_RPMSGSOCKET=y
 CONFIG_EXPERIMENTAL=y
@@ -63,9 +64,10 @@ CONFIG_FS_ROMFS=y
 CONFIG_FS_RPMSGFS=y
 CONFIG_FS_TMPFS=y
 CONFIG_IDLETHREAD_STACKSIZE=4096
-CONFIG_INIT_ENTRYPOINT="nsh_main"
-CONFIG_INIT_STACKSIZE=4096
+CONFIG_INIT_ENTRYPOINT="init_main"
+CONFIG_INIT_STACKSIZE=8192
 CONFIG_INTELHEX_BINARY=y
+CONFIG_LIBC_EXECFUNCS=y
 CONFIG_LIBC_HOSTNAME="proxy"
 CONFIG_LIBC_LOCALE=y
 CONFIG_LIBC_LOCALTIME=y
@@ -94,6 +96,7 @@ CONFIG_RPTUN=y
 CONFIG_RPTUN_IVSHMEM=y
 CONFIG_RPTUN_IVSHMEM_NAME="0:server:s"
 CONFIG_SCHED_BACKTRACE=y
+CONFIG_SCHED_CHILD_STATUS=y
 CONFIG_SCHED_EVENTS=y
 CONFIG_SCHED_HAVE_PARENT=y
 CONFIG_SCHED_HPWORK=y
@@ -123,6 +126,8 @@ CONFIG_SYSLOG_TIMESTAMP=y
 CONFIG_SYSTEM_CUTERM=y
 CONFIG_SYSTEM_DUMPSTACK=y
 CONFIG_SYSTEM_NSH=y
+CONFIG_SYSTEM_NSH_STACKSIZE=8192
+CONFIG_SYSTEM_NXINIT=y
 CONFIG_UART1_BASE=0x9000000
 CONFIG_UART1_IRQ=33
 CONFIG_UART1_PL011=y

boards/arm/qemu/qemu-armv7a/configs/rpserver/defconfig

@@ -48,6 +48,7 @@ CONFIG_DRIVERS_VIRTIO_MMIO=y
 CONFIG_DRIVERS_VIRTIO_RNG=y
 CONFIG_DRIVERS_VIRTIO_RPMSG=y
 CONFIG_DRIVERS_VIRTIO_SERIAL=y
+CONFIG_ETC_ROMFS=y
 CONFIG_EXAMPLES_HELLO=y
 CONFIG_EXAMPLES_RPMSGSOCKET=y
 CONFIG_EXPERIMENTAL=y
@@ -65,9 +66,10 @@ CONFIG_FS_RPMSGFS=y
 CONFIG_FS_RPMSGFS_SERVER=y
 CONFIG_FS_TMPFS=y
 CONFIG_IDLETHREAD_STACKSIZE=4096
-CONFIG_INIT_ENTRYPOINT="nsh_main"
-CONFIG_INIT_STACKSIZE=4096
+CONFIG_INIT_ENTRYPOINT="init_main"
+CONFIG_INIT_STACKSIZE=8192
 CONFIG_INTELHEX_BINARY=y
+CONFIG_LIBC_EXECFUNCS=y
 CONFIG_LIBC_HOSTNAME="server"
 CONFIG_LIBC_LOCALE=y
 CONFIG_LIBC_LOCALTIME=y
@@ -94,6 +96,7 @@ CONFIG_RPTUN=y
 CONFIG_RPTUN_IVSHMEM=y
 CONFIG_RPTUN_IVSHMEM_NAME="0:proxy:m"
 CONFIG_SCHED_BACKTRACE=y
+CONFIG_SCHED_CHILD_STATUS=y
 CONFIG_SCHED_EVENTS=y
 CONFIG_SCHED_HAVE_PARENT=y
 CONFIG_SCHED_HPWORK=y
@@ -123,7 +126,10 @@ CONFIG_SYSTEM_CUTERM=y
 CONFIG_SYSTEM_CUTERM_DEFAULT_DEVICE="/dev/ttyproxy"
 CONFIG_SYSTEM_DUMPSTACK=y
 CONFIG_SYSTEM_NSH=y
+CONFIG_SYSTEM_NSH_STACKSIZE=8192
+CONFIG_SYSTEM_NXINIT=y
 CONFIG_TTY_LAUNCH=y
+CONFIG_TTY_LAUNCH_ENTRYPOINT="nsh_main"
 CONFIG_TTY_LAUNCH_STACKSIZE=2048
 CONFIG_TTY_SIGINT=y
 CONFIG_UART1_BASE=0x9000000

boards/arm/qemu/qemu-armv7a/configs/smp/defconfig

@@ -22,6 +22,7 @@ CONFIG_DEBUG_FEATURES=y
 CONFIG_DEBUG_FULLOPT=y
 CONFIG_DEBUG_SYMBOLS=y
 CONFIG_DEFAULT_TASK_STACKSIZE=4096
+CONFIG_ETC_ROMFS=y
 CONFIG_EXAMPLES_HELLO=y
 CONFIG_EXPERIMENTAL=y
 CONFIG_FLASH_SIZE=127926272
@@ -32,7 +33,8 @@ CONFIG_FS_ROMFS=y
 CONFIG_HAVE_CXX=y
 CONFIG_HAVE_CXXINITIALIZE=y
 CONFIG_IDLETHREAD_STACKSIZE=4096
-CONFIG_INIT_ENTRYPOINT="nsh_main"
+CONFIG_INIT_ENTRYPOINT="init_main"
+CONFIG_INIT_STACKSIZE=8192
 CONFIG_INTELHEX_BINARY=y
 CONFIG_LIBC_EXECFUNCS=y
 CONFIG_MM_KASAN=y
@@ -48,6 +50,8 @@ CONFIG_RAM_VSTART=0x40200000
 CONFIG_RAW_BINARY=y
 CONFIG_READLINE_CMD_HISTORY=y
 CONFIG_RR_INTERVAL=200
+CONFIG_SCHED_CHILD_STATUS=y
+CONFIG_SCHED_HAVE_PARENT=y
 CONFIG_SCHED_HPWORK=y
 CONFIG_SCHED_HPWORKPRIORITY=192
 CONFIG_SMP=y
@@ -57,6 +61,8 @@ CONFIG_START_MONTH=4
 CONFIG_START_YEAR=2023
 CONFIG_SYMTAB_ORDEREDBYNAME=y
 CONFIG_SYSTEM_NSH=y
+CONFIG_SYSTEM_NSH_STACKSIZE=8192
+CONFIG_SYSTEM_NXINIT=y
 CONFIG_SYSTEM_SYSTEM=y
 CONFIG_TESTING_GETPRIME=y
 CONFIG_TESTING_KASAN=y

boards/arm/qemu/qemu-armv7a/src/CMakeLists.txt

@@ -27,3 +27,17 @@ if(CONFIG_LIBC_FDT)
 endif()
 
 target_sources(board PRIVATE ${SRCS})
+
+if(CONFIG_ETC_ROMFS AND CONFIG_SYSTEM_NXINIT)
+  nuttx_add_romfs(
+    NAME
+    etc
+    MOUNTPOINT
+    etc
+    RCSRCS
+    etc/init.d/init.rc
+    PATH
+    ${CMAKE_CURRENT_BINARY_DIR}/etc)
+
+  target_link_libraries(board PRIVATE romfs_etc)
+endif()

boards/arm/qemu/qemu-armv7a/src/Makefile

@@ -24,6 +24,12 @@ include $(TOPDIR)/Make.defs
 
 CSRCS = qemu_boardinit.c qemu_bringup.c
 
+ifeq ($(CONFIG_ETC_ROMFS),y)
+ifeq ($(CONFIG_SYSTEM_NXINIT),y)
+  RCSRCS += etc/init.d/init.rc
+endif
+endif
+
 ifeq ($(CONFIG_LIBC_FDT),y)
 CFLAGS += ${INCDIR_PREFIX}$(TOPDIR)$(DELIM)libs$(DELIM)libc$(DELIM)fdt$(DELIM)dtc$(DELIM)libfdt
 endif

boards/arm/qemu/qemu-armv7a/src/etc/init.d/init.rc

@@ -0,0 +1,33 @@
+/****************************************************************************
+ * boards/arm/qemu/qemu-armv7a/src/etc/init.d/init.rc
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.  The
+ * ASF licenses this file to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the
+ * License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ *
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#ifdef CONFIG_SYSTEM_NSH
+service console sh
+   restart_period 1000
+#endif
+
+on init
+#ifdef CONFIG_SYSTEM_NSH
+   start console
+#endif