i've read all sorts of things on the internet. standard usb is 500ma.
some devices will take more than 500ma, and some motherboards will give more than 500ma.
i know apple computers will allow up to 1000ma on usb when a special handshake occurs between the mac and an apple brand accessory like the usb superdrive.
i know hackintosh builds like my own (with an asus mobo) will indiscriminately deliver up to 1000ma via usb
i would like to power the rbp from an mba. it definitely has enough power to boot up, but does anybody have any experience with the power requirements of the EFI flash process and the 500ma supply?
Well, you have to take into account the power requirements of the pi and the chip it is trying to communicate with as well as the voltage the SPI chip is going to need. In my experience you will need 2.5 amps on Pi 2 to successfully initiate an SPI transaction. In my opinion, this will not work for what you are trying to do. Although, since you are trying to create a tool with a screen etc... I suggest looking into 18650 batteries to power the pi as a stand alone device. Assuming this is going along with the conversation we had the other day.
i've considered the battery route to go completely portable, in which case a screen would be super fun and power wouldn't be a big deal with the right battery.
i'm currently using 6" leads, and VNC from a macbook air for control and hex edit. that's why i'd like to power it from the MBA.
else if
there's a really cool screen for the rbp but it uses some of the SPI pins needed for flashing. is it possible to reprogram/repurpose the GPIO header? the rbp screen that uses the display connector is friggin huge and shits all over my tiny portable plans
There has to be a display out there that uses a different protocol, I have not looked around yet, but I imagine it isn't too far fetched to say you could do both. You could use the display port with a custom solution?
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