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Re: How does boot loader pass initrd address / size to kernel?

To: Rajat Jain <rajat.noida.india@gmail.com>
Subject: Re: How does boot loader pass initrd address / size to kernel?
From: Thiemo Seufer <ths@networkno.de>
Date: Thu, 15 Mar 2007 13:43:06 +0000
Cc: linux-mips@linux-mips.org
In-reply-to: <20070315133950.GA25863@networkno.de>
Original-recipient: rfc822;linux-mips@linux-mips.org
References: <b115cb5f0703150143y46a1f877m9dbb43345721c355@mail.gmail.com> <20070315133950.GA25863@networkno.de>
Sender: linux-mips-bounce@linux-mips.org
User-agent: Mutt/1.5.13 (2006-08-11)
Thiemo Seufer wrote:
> Rajat Jain wrote:
> > Hi,
> > 
> > I'm running an ancient Linux kernel 2.4.20 (please don't ask me why
> > :-( ) on a MIPS 4KEC. I am experimenting with initrd and my initrd
> > fails to mount. My bootloader (U-BOOT) coorectly loads the initrd into
> > RAM as I can see.
> > 
> > I am wondering how does the kernel get to know the address at which
> > the initrd is loaded by boot loader? How does the boot loader
> > communicate this to the kernel?
> > 
> > I can see that when emebedding root filesystem into kernel image, the
> > symbols __rd_start and __rd_end are defined by the linker script and
> > hence the kernel gets to know. However, how does this happen when
> > bootloader loads the ramdisk and needs to tell the kernel?
> 
> http://www.linux-mips.org/wiki/Kernel_Command_Line_Arguments mentions
> rd_start and rd_size which are used for this purpose.

... and they IIRC didn't exist in 2.4.20, but e.g. Debian's 2.4 mips
kernels carry a patch to add such support.


Thiemo

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