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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 13:39:50 +0000
Cc: linux-mips@linux-mips.org
In-reply-to: <b115cb5f0703150143y46a1f877m9dbb43345721c355@mail.gmail.com>
Original-recipient: rfc822;linux-mips@linux-mips.org
References: <b115cb5f0703150143y46a1f877m9dbb43345721c355@mail.gmail.com>
Sender: linux-mips-bounce@linux-mips.org
User-agent: Mutt/1.5.13 (2006-08-11)
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.


Thiemo

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