4.4. Implementation
We will need to have a read−write filesystem in order for some of the commands to work. The kernel's normal
behavior is to mount root as read−only, but we can change this using a kernel option. By passing the kernel
the rw option before init=/bin/sh we will get a read−write root filesystem.
4.4.1. System startup
Follow these steps to get the system running.
Boot the PC from using the GRUB boot disk.•
At the grub> prompt, type kernel (fd0)/boot/vmlinuz rw init=/bin/sh
root=/dev/fd0 load_ramdisk=1 prompt_ramdisk=1.
•
Verify that you remembered to add the rw parameter and press Enter.•
Type boot and press Enter.•
Insert the recently created root disk when prompted.•
The terminal display should look similar to the example below.
GNU GRUB version 0.95
grub> kernel (fd0)/boot/vmlinuz rw init=/bin/sh root=/dev/fd0 load_ramdisk=1 prompt_ramdisk=1
[Linux−bzImage, setup=0xc00, size=0xce29b]
grub> boot
Linux version 2.4.26
..
.. [various kernel messages]
..
VFS: Insert root floppy disk to be loaded into RAM disk and press ENTER
RAMDISK: Compressed image found at block 0
VFS: Mounted root (ext2 filesystem) read−write.
Freeing unused kernel memory: 178k freed
# _
4.4.2. Testing new commands
Now that the system is up and running, try using some of the new commands.
bash# uname −a
bash# ls /etc
bash# echo "PocketLinux" > /etc/hostname
bash# hostname $(cat /etc/hostname)
bash# uname −n
bash# mkdir /home/stuff
bash# cd /home/stuff
If everything goes well the commands like cat, ls and hostname should work now. Even mkdir should work
since the root filesystem is mounted read−write. Of course since we are using a ramdisk, any changes will be
lost once the PC is reset.
Pocket Linux Guide
Chapter 4. Some Basic Utilities 19
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