[U-Boot] SATA/IDE/etc... init

[Mike Frysinger]

the SATA/IDE/etc... layers seem to go against the u-boot policy when it comes 
to initialization.  in other words, if support for them is enabled, then they 
are unconditionally initialized in board code (see ide_init / sata_initialize 
in lib_*/board.c:board_init_r).  am i missing something or should these init 
functions be delayed until the sata/ide/whatever functions need them ?  or 
should they be made explicit like some commands where you first have to do 
"sata init" before you can access the device ?

this bugs me most because normally u-boot starts up nice & fast, but now that 
we've added SATA support, there's an annoying second or 3 pause while the disk 
is probed ...
-mike
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