Example of ARM based linux board using initramfs and serialconsole

[Alexander Wolfson]

All this happened to be an error in a memory map plus hardware bug in
the processor that is not completely solved yet. Basically nothing
related to initramfs itself.

As a positive outcome I bought couple of books and improved my
understanding of the Embedded Linux. 

BTW I would highly recommend "Embedded Linux Primer" by Christopher
Hallinan 
I wish I had it earlier. It would save me some trouble :)

Thanks everybody for help.

Alex
-----Original Message-----
From: gnhlug-discuss-bounces at mail.gnhlug.org
[mailto:gnhlug-discuss-bounces at mail.gnhlug.org] On Behalf Of Michael
Nolin
Sent: Friday, July 11, 2008 1:53 PM
To: Ben Scott; Thomas Charron
Cc: gnhlug-discuss at mail.gnhlug.org
Subject: Re: Example of ARM based linux board using initramfs and
serialconsole




--- On Fri, 7/11/08, Thomas Charron <twaffle at gmail.com> wrote:

> From: Thomas Charron <twaffle at gmail.com>
> Subject: Re: Example of ARM based linux board using initramfs and
serial console

> > > says it can be a root FS by the kernel.
> >  We're still talking Linux, right?
>  (The kernel will panic if it then cannot
> find an initial
> > program to start, but it will still mount the
> filesystem first.)
> >  You may be thinking of the "rdev" field in
> the kernel boot image
> > file.  It gives major and minor numbers for the
> default root device,
> > which are used if you don't specify a
> "root=" argument on the kernel
> > command line.
> 
>   I was talking specifically about an initramfs, which
> specifically
> uses cpio.  initramfs.c checks for a magic flag in the

I would recommend "Understanding the Linux Kernel" and "Linux Kernel
Development Second Edition"

kernel/init 

        do_mounts.h         do_mounts_md.c    Kconfig  Makefile
version.o
do_mounts.c        do_mounts_initrd.c       initramfs.c     main.c   
do_mounts_devfs.c    do_mounts_rd.c          version.c

These files and kernel initialization is explained in these references.
Very little if any ARM specific dependencies here.

grep -i ARM *
Binary file built-in.o matches
Binary file do_mounts_initrd.o matches
Binary file do_mounts.o matches
Binary file do_mounts_rd.o matches
Binary file initramfs.o matches
Kconfig:        default y if ARM || H8300
Kconfig:config OBSOLETE_MODPARM
main.c: printk("early_parm_test: %s\n", rest ?: "(null)");
Binary file main.o matches

My own project had a generous block of DDR memory for the creation of
this ramfs. 

Michael Nolin
Embedded Solutions Unlimited, LLC





      
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