From: Thiemo Seufer <ths@networkno.de>
To: Rajat Jain <rajat.noida.india@gmail.com>
Cc: linux-mips@linux-mips.org
Subject: Re: How does boot loader pass initrd address / size to kernel?
Date: Thu, 15 Mar 2007 13:43:06 +0000 [thread overview]
Message-ID: <20070315134306.GB25863@networkno.de> (raw)
In-Reply-To: <20070315133950.GA25863@networkno.de>
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
next prev parent reply other threads:[~2007-03-15 13:52 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-03-15 8:43 How does boot loader pass initrd address / size to kernel? Rajat Jain
2007-03-15 13:39 ` Thiemo Seufer
2007-03-15 13:43 ` Thiemo Seufer [this message]
2007-03-16 5:08 ` Rajat Jain
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