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Subject[PATCH] Initrd Dynamic v4.2 - New Feature: Tmpfs root support
Date
Linus and Alan, 

Initrd Dynamic is mature, stable, well mantained code. It makes very minimal
impact to the current source tree, segrigating itself to it's own source
files. It is fully backwards compatible with current initrd operations.

Please consider it for inclusion in the next 2.4 kernel release.

2.4.9 kernel patch
ftp://ftp.psychosis.com/linux/initrd-dyn/kernelpatches/initrd-dyn_4.2_2.4.9.diff.gz

2.0 and 2.2 kernel patches:
ftp://ftp.psychosis.com/linux/initrd-dyn/kernelpatches/

More info
ftp://ftp.psychosis.com/linux/initrd-dyn/README
-----------------------------------------------------------
About:
Current Release: 4.2

Initrd Dynamic supercedes Initrd Archive. This function subset was
first written in January 1998 and has progressed in features since
then. Developed for the Linux Router Project, it is in wide spread
use in various Linux embedded systems and thin OS's.


kernelpatches/
Patches for Linux 2.0, 2.2, and 2.4 kernels.
The kernel patches include the base files, required changes to rd.c
and configuration files, and a fix in main.c to allow /linuxrc
even if root=/dev/ram0. (Long standing bug)
-------------------------------------------------------------
What is it:
Initial RAM disk dynamic creation support
CONFIG_BLK_DEV_INITRD_DYN
Initrd Dynamic allows you to use tar.gz archive(s) instead of those
nasty raw images. It works by dynamically creating a filesystem at
boot, mounting it as '/', then extracting the archive(s) loaded into
the initrd memory space. If your bootloader can load multiple archives
sequentially (IE a patched GRUB) all archives will be extracted in the
order they where loaded.

Optionally Initrd Dynamic can create the /dev directory and some
failsafe console files.

You must select at least one of the available filesystems below.
You probably want to use tmpfs if it's available in your kernel.

The kernel parameter to specify options is:
initrd_dyn=fstype[,fssize[k|m]][,mkdev]
fstype == One of the supported dynamic mkfs filesystems.

fssize == Limits the size of the filesystem created.
tmpfs: If not speced it's equal to the real memory space.
minix: If not speced it's equal to ramdisk_size.

mkdev == /dev is created after archive untar. Useful even if devfs=mount.

Examples:
initrd_dyn=tmpfs load_ramdisk=1
initrd_dyn=tmpfs,4096k load_ramdisk=1
initrd_dyn=tmpfs,16m,mkdev load_ramdisk=1

initrd_dyn=minix,8m ramdisk_size=20480 root=/dev/ram0 load_ramdisk=1
initrd_dyn=minix,,mkdev root=/dev/rd/0 load_ramdisk=1

Initial RAM disk tmpfs auto filesystem support
CONFIG_BLK_DEV_INITRD_DYN_TMPFS
Specing initrd_tar=tmpfs[,fssize] will have the kernel dynamically
mount a tmpfs filesystem as the root. Spec a normal tar.gz file for
the boot loader to load as the initrd root archive.

Initial RAM disk minix auto filesystem support
CONFIG_BLK_DEV_INITRD_DYN_MINIX
Specing initrd_tar=minix[,fssize] will have the kernel dynamically
create a minix filesystem on /dev/ram0 at boot time. Spec a normal
tar.gz file for the boot loader to load as the initrd root archive.
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