U-Boot slow "uncompressing"

[Andy Green]

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Hi folks -

I brought this one up some weeks ago, but I figured it was "just me"
somehow.  On a GTA02 A4:

Hit Reset button
                                                     5.6s
NAND read: device 0 offset 0x80000, size 0x200000
                                                     4.6s
Uncompressing Kernel Image ...
                                                     9.2s
Starting kernel ...

Apparently Werner has seen a 2s "uncompressing" phase on a GTA02 A3.  I
rebuilt U-Boot from their git and only the Moko patches yesterday to try
to figure out where I had gone wrong, but it did not work any better or
different, ~9s on two boards here.

I changed my kernel build script to take the -9 out of gzip, then to use
the kernel makefile uImage target instead of doing the steps by hand, no
real difference.

I looked into the gunzip malloc usage in case that was thrashing around
but it didn't seem insane.  The caches are meant to be enabled at that
time.  And the Verifying Checksum part happens in under a second anyway.

- -Andy
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