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On Wed, 7 Mar 2012, Jean-Christophe PLAGNIOL-VILLARD wrote:

> On 11:40 Wed 07 Mar     , Stephen Warren wrote:
> > On 03/07/2012 11:08 AM, Jean-Christophe PLAGNIOL-VILLARD wrote:
> > > On 17:30 Tue 06 Mar     , Stephen Warren wrote:
> > >> This allows the user to use U-Boot's mkimage's -T kernel_noload option
> > >> if their arch Kconfig allows it, and they desire.
> > >>
> > >> Signed-off-by: Stephen Warren <swarren@xxxxxxxxxxxxx>
> > >> ---
> > >> The next patch enables this new CONFIG_ALLOW_ option for ARM. I assume
> > >> that some other architectures will also be able to enable it, but I'm
> > >> not familiar enough with any to know which.
> > > I'm going to repeat. I don't think any impromevent here.
> > > 
> > > with no specific kernel load address the uImage for is useless/
> > 
> > No, the whole point of this type of kernel image is that it doesn't need
> > a specific load address; the kernel zImage can run from anywhere in RAM
> > (provided AUTO_ZRELADDR is enabled, subject to some slight
> > restrictions), and hence the uImage doesn't need to be loaded to or
> > moved to any particular location.
> > 
> > The scripts that U-Boot runs determine where the image gets loaded into
> > memory.
> so instead of spending time on the uImage add simply the support the zImage to
> U-Boot as this AUTO_ZRELADDR have 0 advantage compare to the zImage

This was attempted in the past with the result that you might guess.

> > > And this no the job of the kernel to build a boot loader specific boot image
> > > format.
> > 
> > Not everyone agrees with this.
> so if a new boot loader apear or a new format the kernel will have to support
> it. No

Well, apparently new bootloaders are being corrupted by the u-Boot image 
format themselves.

And in the end I don't mind that much, as long as this is once again 
made architecture independent and therefore implemented in an 
architecture independent way in the kernel build system.

> > U-Boot does not currently have the ability to boot zImage on ARM.
> so add it and drop the uImage format

Why don't you try yourself?  I bet you already did in the past.

> > > Further more on server the vendor will use grub mostly (even on ARM) and will
> > > expect to boot a zImage.
> > 
> > But that is irrelevant for the people who are using U-Boot not grub.
> execpt the zIamge is the common boot format for all the server and PC and
> other boot loader

Look Jean-Christophe, we do have a kernel maintenance problem here.  
The goal of this patch series is to solve that maintenance problem while 
preserving the same level of support as before, not to change the world.

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