[U-Boot] [PATCH 2/2] FIT image: use compression = "none" for ramdisks

[Simon Goldschmidt]

Dear Wolfgang,

On 30.07.2018 13:45, Wolfgang Denk wrote:
> Dear Simon,
> 
> In message <20180730105319.79424-2-sgoldschmidt at de.pepperl-fuchs.com> you wrote:
>> To prepare supporting compression for all image types, change
>> compression to "none" for ramdisks in all examples.
> 
> What makes you think this is a correct thing to do?
> 
> There are different approaches to handle things.  For example,
> traditionally on Power Architecture we would use a raw kernel
> binray, compress this (for example with gzip) before wrapping it
> with mkimage into an (uImage or FIT) U-Boot image, and then let
> U-Boot uncompress the kernel image into rum and start it.  On ARM
> the kernel comes traditionally with it's own wrapper that does
> unompressions and such.
> 
> Same for ramdisk handling.  On some systems it may make sense to
> have U-Boot handle the uncompressing, so compression = "gzip";
> may be fully intentional.

That's the whole point and in the thread I mentioned 
(https://lists.denx.de/pipermail/u-boot/2018-July/336435.html) it has 
been discussed that this is the future goal.

However, uncompression currently is only implemented for kernels, not 
for other sub-images. This patch aims at updating the docs and the 
current .its examples to what they do now.

Best regards,
Simon