U-Boot slow "uncompressing"

[Andy Green]

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Somebody in the thread at some point said:

>> In OE we're no longer using the u-boot uncompressor, but use the
>> one built in in the kernel, which is way faster.
> 
> Wah thanks Mickey, I'll change over... that explains it.

Yep chopped decompression down to ~1s... great...

It's ~18s from power -> rootfs mounted and init running now... that
includes putting the splash up but with loglevel=0 so there are no boot
messages on the LCM.

If we set init=/bin/sh on the kernel commandline, we can actually meet
this 20s boot time target... kinda.... ;-)

- -Andy
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