[U-Boot-Users] Uncompression of image takes time.

Adarsh Babu adarshrbpin at yahoo.co.in
Mon Mar 5 16:09:18 CET 2007

Jerry Van Baren <gerald.vanbaren <at> comcast.net> writes:
> Hi Adarsh,
> Other generic things that can cause slow execution are:
> * Caches disabled (data and/or instruction)
>    * Caches are very sharp knives: they can slice and
>        dice quickly and finely, or they can turn on
>        you and slice your fingers off.  For initial board
>        bring-up, caches are usually disabled.
> * Memory configuration
>    * The memory interface is typically initialized with
>        the slowest settings possible on power up: if they
>        are not optimized, the CPU will run slower than it
>        could run.
> Let us know what you find, so the next person down this path will find 
> the solution  rather than just the problem.  (The internet: the worlds 
> largest knowledge base hidden in a vast wasteland of ignorance.)
> HTH,
> gvb
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Hi Jerry,

I enabled the Instruction cache for MCF5271 and then tried decompressing the 
image. I have got the decompression time down to 12 seconds from the earlier 
25 seconds with this implementation. Thanx a lot for the suggestion.


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