[PATCH 0/3] patches to allow DTB to be appended to the ARM zImage
shawn.guo at freescale.com
Sun Jun 12 04:34:15 EDT 2011
On Sun, Jun 12, 2011 at 09:15:41AM +0100, Russell King - ARM Linux wrote:
> On Sun, Jun 12, 2011 at 02:06:37AM -0400, Nicolas Pitre wrote:
> > This is a resend of those patches with fixups after the latest changes
> > in mainline.
> > [PATCH 1/3] ARM: zImage: ensure it is always a multiple of 64 bits in size
> > This one is new and trivial.
> > [PATCH 2/3] ARM: zImage: Allow the appending of a device tree binary
> > Mostly John Bonesio's version with some adjustments and cleanups.
> > [PATCH 3/3] ARM: zImage: make sure appended DTB doesn't get overwritten by kernel .bss
> > New, simpler alternative to Tony Lindgren's version.
> One thing which has been bugging me for some time is that the DT stuff
> completely overrides the ATAGs. This is wrong with solutions like this.
> We have a set of perfectly good boot loaders which provide correct
> information to the kernel via ATAGs. If we start moving everything
> over to DT, then we run into a problem because the ATAGs are ignored -
> stuff such as the RAM size and command line passed from the boot loader
> will be entirely ignored, instead these having to be encoded into the
> kernel at build time.
What u-boot does right now is replacing the parameters in dtb with
its for those it's interested in, for example command line is one,
before it passes dtb to kernel.
More information about the linux-arm-kernel