Note: Please adhere to Contributing Guidelines.

Summary

imx95 board run linux and nuttx at the same time

1. nuttx use lpuart1 as console, linux use usb otg as adb debug console
2. this method need linux driver boot nuttx
3. the kernel patch
4. the adb setup
   1. download and build:
      https://gitee.com/qaq-cmd/adbd/tree/master
   2. put the adbd_debug to /root
   3. set up usb otg: put ths adbd.sh to /root, chmod +x adbd.sh
   4. ln -s /bin/bash /system/bin/sh
   5. auto start adbd:
      cp adbd.service /etc/systemd/system
      systemctl start adbd
      systemctl enable adbd
5. kernel patch and nuttx.ko
   1. put the nuttx directory to /home/lipengfei28/android/imx_9/sources/meta-imx/meta-imx-bsp/recipes-kernel
   2. patch to kernel
   3. bitbake -C compile linux-imx && bitbake nuttx
   4. adb shell; mkdir /root/boot; mount /dev/mmcblk0p1 boot
   5. adb push *dtb /root/boot
   6. adb push Image /root/boot
   7. reboot
6. build nuttx for imx95
   ./tools/configure.sh imx95-a55-evk:nsh && make
   adb push nuttx.bin /root
7. boot nuttx:
   echo 0 > /sys/devices/system/cpu/cpu0/online
   insmod nuttx.ko
8. Enter nshell
   [ 1.975564] platform 4acf0000.dsi: Fixed dependency cycle(s) with /soc/bus@44000000/i2c@44350000/hdmi@3d
   [ 1.984898] platform hdmi-connector: Fixed dependency cycle(s) with /soc/bus@44000000/i2c@44350000/hdmi@3d
   [ 1.994507] i2c 1-003d: Fixed dependency cycle(s) with /soc/dsi@4acf0000
   [ 2.001114] i2c 1-003d: Fixed dependency cycle(s) with /hdmi-connector
   [ 2.008196] adp5585 1-0034: error -EIO: Failed to read device ID
   [ 2.014043] adp5585 1-0034: probe with driver adp5585 failed with error -5
   [ 2.020874] i2c i2c-1: LPI2C adapter registered
   [ 2.026425] imx8mq-usb-phy 4c1f0040.phy: supply vbus not found, using dummy regulator
   [ 2.038785] platform 4ad50000.isi: Fixed dependency cycle(s) with /soc/syscon@4ac10000/formatter@20
   [ 2.047684] platform 4ad30000.csi: Fixed dependency cycle(s) with /soc/syscon@4ac10000/formatter@20
   [ 2.056765] platform 4ac10000.syscon:formatter@20: Fixed dependency cycle(s) with /soc/isi@4ad50000
   [ 2.065674] platform 4ac10000.syscon:formatter@20: Fixed dependency cycle(s) with /soc/csi@4ad30000
   [ 2.077393] platform 4acf0000.dsi: Fixed dependency cycle(s) with /soc/syscon@4b010000/bridge@8
   [ 2.085936] platform 4b010000.syscon:bridge@8: Fixed dependency cycle(s) with /soc/dsi@4acf0000
   [ 2.094563] platform 4b010000.syscon:bridge@8: Fixed dependency cycle(s) with /soc/bridge@4b0d0000/channel@0
   [ 2.110173] 42590000.serial: ttyLP0 at MMIO 0x42590010 (irq = 110, base_baud = 1500000) is a FSL_LPUART
   [ 2.119462] printk: legacy console [ttyLP0] enabled
   [ 2.129043] printk: legacy bootconsole [lpuart32] disabled

• Ready to Boot Primary CPU
• Boot from EL2
• Boot from EL1
• Boot to C runtime for OS Initialize

NuttShell (NSH) NuttX-12.9.0
nsh>
nsh>
nsh>
nsh> ls
/:
dev/
proc/
nsh>

Update this section with information on why change is necessary,
what it exactly does and how, if new feature shows up, provide
references (dependencies, similar problems and solutions), etc.

Impact

Update this section, where applicable, on how change affects users,
build process, hardware, documentation, security, compatibility, etc.

Testing

Update this section with details on how did you verify the change,
what Host was used for build (OS, CPU, compiler, ..), what Target was
used for verification (arch, board:config, ..), etc. Providing build
and runtime logs from before and after change is highly appreciated.