Question on initrd and initramfs

Hello,

On Sun, Sep 30, 2012 at 5:01 AM, Mulyadi Santosa
[off-list ref] wrote:

Hi Tobi...

On Sun, Sep 30, 2012 at 1:10 AM, Tobias Boege [off-list ref] wrote:

quoted

Have you read Documentation/filesystems/ramfs-rootfs-initramfs.txt? I didn't
but there are some eye-catching statements:

1. initramfs becomes a rootfs (l. 86)
2. rootfs is a special instance of ramfs (l. 73)
3. ramfs cannot be turned off (l. 29ff)

This means that initramfs cannot be turned off.

4. initramfs is a gzipped cpio archive and contained within the kernel
   (l. 85) and so is the cpio extractor code (l. 166f)
5. initramfs is automatically loaded as rootfs (l. 86)

Interesting catch, Tobi..... for sure sometimes I am too lazy to read
the documentation.

Just wanted to add something fresh. I'm reading through ramfs sources:

$ wc -l fs/ramfs/*.c
   55 fs/ramfs/file-mmu.c
  267 fs/ramfs/file-nommu.c
  289 fs/ramfs/inode.c
  611 total

600 lines! This is really readable! There's even a note from Linus
saying it's a nice template
code to read as a fs starting point.

Interesting, uh?

    Ezequiel