Kernel panic - not syncing: No init found.

Great!! I am happy with your success.

You can use "free" to find out the memory usage.

You can try the following to reduce the memory usage.

1. The default busybox use more options than you will need.

You can reduce the commands or features supported by busybox, only keep those you will use.

cd ~/buildroot/build_nios2/busybox

make menuconfig

make

cd ~/buildroot

make

2. reduce the kernel, reduce unused driver and file system.

cd ~/linux-2.6.x

make ...... menuconfig

make

3. remove unused files and nodes in rootfs/etc and rootfs/dev

4. you can delete files at run time when they are no longer in use.

After carefully checking, the memory usage can be reduced by almost 50%.