[U-Boot] [PATCH 1/2] image: Implement IH_TYPE_KERNEL_ANYLOAD

Marek Vasut
2011-11-10T17:01:50Z

> On 11/10/2011 02:58 AM, Marek Vasut wrote:
> >> The legacy uImage format includes an absolute load and entry-point
> >> address. When bootm operates on a kernel uImage in memory that isn't
> >> loaded at the address in the image's load address, U-Boot will copy
> >> the image to its address in the header.
> >>
> >> Some kernel images can actually be loaded and used at any arbitrary
> >> address. An example is an ARM Linux kernel zImage file. To represent
> >> this capability, IH_TYPE_KERNEL_ANYLOAD is implemented, which operates
> >> just like IH_TYPE_KERNEL, except that the load address header is
> >> ignored, and U-Boot does not copy the image to its load address, but
> >> rather uses it in-place.
> >>
> >> This is useful when sharing a single (uImage-wrapped) zImage across
> >> multiple boards with different memory layouts; in this case, a specific
> >> load address need not be picked when creating the uImage, but instead
> >> is selected by the board-specific U-Boot environment used to load and
> >> boot that image.
> >>
> >> Signed-off-by: Stephen Warren <swarren@nvidia.com>
> >> ---
> >
> > Hi Stephen,
> >
> > just a silly question, but didn't we agree on cmd_bootz? Or is this
> > unrelated ?
>
> bootz did seem to be agreed upon initially, but Wolfgang's most recent
> response suggested that a new IH_TYPE would be acceptable, and it's a
> lot less code to implement. At a later point, bootz could still be
> implemented if desired.

Well DAMN. I think I'll probably implement bootz, because it seems superior
solution which I DID NEED for one of my devices for a while now (if noone is
working on it already). I can't say what ETA will be on that, maybe next week,
maybe two weeks.

M