[support-gang] XO-1 vs Sugar 0.104 performance, and swap to NAND Flash

[Yioryos Asprobounitis]

> 
> To check, make sure the laptop is unlocked, and add this to the second
> line of the boot/olpc.fth file:
> 
>     dev /sd  patch 2drop cb! sdhci-card-power-off  dend
> 


Does this keep the SD slot powered only when is occupied or regardless?
Does the OS takes over the SD slot power management after boot?
If not, can OFW detect the presence of an external SDcard early, and keep it powered only then
or detect its absence latter in the boot sequence and revert?