[U-Boot-Users] Rephrased Initrd and RAM

Petre Pircalabu petrica at ict-rom.com
Wed May 26 22:53:13 CEST 2004


The patch corrected the problem and I was able (finally) to
boot the Linux kernel.

Best Regards,

Petre Pircalabu
----- Original Message -----
From: "Wolfgang Denk" <wd at denx.de>
To: "Petre Pircalabu" <petrica at ict-rom.com>
Cc: <u-boot-users at lists.sourceforge.net>
Sent: Wednesday, May 26, 2004 11:01 PM
Subject: Re: [U-Boot-Users] Rephrased Initrd and RAM

> In message <002d01c4434f$71195720$0e25b3d4 at ictrom.intern>
you wrote:
> >
> > In order for the Linux kernel to use the initrd, where
> > should be located, in RAM or in FLASH? The parameter
> It should not matter where it is located.
> Some (older?) versions of the ARM kernel don't support
ramdisk images
> in flash, i. e. they require a patch to avoid the
superfluous memcpy.
> See the list archives - I've posted the required details
> > u-boot to the kernel (e.g setenv bootargs
> > initrd=0x120000,4M) is the address where initrd.img
> No such parameter is needed. U-Boot passes the address of
the ramdisk
> image (if any) automatically to the kernel.
> > one compressed and mkimaged) is stored  or u-boot is
> > responsible for [decompressing the image and] copying
it to
> > RAM?
> U-Boot verifies the image (if verify is on), and, if  you
don't  set
> initrd_high  as  documented  to  enable zero-copy ramdisk
support, it
> copies it to RAM; finally it passes it's address (in RAM
or flash) to
> the Linux kernel.
> > One other question :about the variable
initrd_copy_to_ram ,
> > is it set only when initrd_high is defined in the
> No, on contrary. It is set to 1 by default. But  isn't
this  obvious
> from the code?
> > why?
> Which part of the explanation of initrd_high in the
README file don;t
> you understand? Please let me know so I can improve it.
> Best regards,
> Wolfgang Denk
> --
> Software Engineering:  Embedded and Realtime Systems,
Embedded Linux
> Phone: (+49)-8142-4596-87  Fax: (+49)-8142-4596-88
Email: wd at denx.de
> "I used to think that the brain was the most wonderful
organ  in  my
> body. Then I realized who was telling me this."        -
Emo Phillips
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