Brad Midgley wrote:
Hi
But most of them just power the 5V line. This is bad with 99% of the bad
behaving usb gadgets out there.
But Neo is prolite and asks the host if it could draw it's 500mA and if
not only takes 100mA out of the bus.
this excessive politeness rules out hand-crank charger, solar cell,
battery-to-usb, and every auto-usb adapter out there. It's overkill.
the usb spec requires the hub to reply to the request for more power.
no reply within xx ms means there is no hub to ask. At this point it
should be pragmatic and just use the @#&* 500mA.
I tried to hunt this down in the source and I think it's in two
places--uboot when off and the kernel when on. It was very hard to
figure out who drives the control.
Three places.
There is hardware policy, which is set by uboot/the kernel, in the power
control chip.
Well - four places - some of it is configured by resistors on the board.
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