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

[Wolfgang Denk]

Dear Simon,

In message <97a1d1e5-4415-4db4-9c77-72023f37bb4f at de.pepperl-fuchs.com> you wrote:
> 
> It *is* a valid use case. But for current kernels (if compression is 
> enabled), it might be faster to let the kernel unzip the content 
> directly to the memory location where it should reside in the end.

This was true a long, long time ago on ARM (and this is where most
of the unclean implmentations originate), when U-Boot did not enable
caches.  With this fixed, it is almost always wrong, because we now
have an unnecessary memory copy: U-Boot loads the compressed kernel
image to one location in RAM, which then runs and uncompresses the
code to another address.  Is it not obvious that it would be more
efficient if U-Boot did the uncompressing directly? 


Best regards,

Wolfgang Denk

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