Port-arm archive

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index][Old Index]

Re: beaglebone: changing cpu frequency

On Thu, Aug 01, 2013 at 06:36:45PM -0400, Dennis Ferguson wrote:
> Note, however, that for the BB Black, the SRM has a power consumption test 
> with the CPU
> running at 1000 MHz with the HDMI active, the USB port driving a hub and with 
> the other
> USB port and the SD card slot in use, which found the maximum current draw to 
> be
> 485 mA.  The BB Black doesn't necessarily need the CPU frequency dropped when 
> running
> on USB peripheral power, only the BB does, but I'm not sure how one would 
> tell them apart
> in software.

Note that USB only guarantees 100ma. For highter currents, the device
has to request it explicitely (and I'm not sure the BB does request it),
and the host is free to refuse it.

Manuel Bouyer <bouyer%antioche.eu.org@localhost>
     NetBSD: 26 ans d'experience feront toujours la difference

Home | Main Index | Thread Index | Old Index