On Fri Oct 23 15:37:55 PDT 2015, cyberfo...@gmail.com wrote:

> I don't have the Plan9 uSD card handy, but to the best of my recollection
> all Raspberry Pi SD cards have at least two partitions on them.  The ARM
> processor remains halted upon reset and the VideoCore loads the image from
> the (first?) DOS formatted partition.  Once that image is loaded into RAM,
> the ARM processor starts running it.
> 
> I'm not even sure that uboot is involved.
> 
> You might find some useful information at:
> http://raspberrypi.stackexchange.com/questions/10489/how-does-raspberry-pi-boot

u-boot is not used on the rpi.  the firmware load the kernel directly.

- erik

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