[U-Boot] [PATCH 10/13] sunxi: Make the fastboot buffer larger

[Maxime Ripard]

On Fri, Sep 04, 2015 at 01:02:49PM -0400, Tom Rini wrote:
> On Tue, Sep 01, 2015 at 10:44:58AM +0300, Siarhei Siamashka wrote:
> 
> > On Tue, 01 Sep 2015 08:22:04 +0100
> > Ian Campbell <ijc at hellion.org.uk> wrote:
> > 
> > > On Mon, 2015-08-31 at 16:46 +0200, Maxime Ripard wrote:
> > > > When using fastboot and flashing a larger image such as the main partition
> > > > of a system, the current 32MB limit for the buffer is quite small.
> > > 
> > > (Apart from rooting/rescuing the odd phone I'm completely unfamiliar
> > > with fastboot, so sorry if this is all obvious).
> > >  
> > > The main partition of a system these days is measured in GB, I think.
> > > So why does going from 32MB to 256MB for the buffer make a useful
> > > difference?
> > > 
> > > Is there some enormous per-buffer overhead which needs to be amortised?
> > > Or is something else going on?
> > > 
> > > IOW what is the practical impact of this change?
> > 
> > I don't know what are Maxime's plans. But if fastboot is fast and
> > can load the kernel and initrd to the device over USB, then it
> > becomes a useful alternative to using FEL for loading kernel.
> 
> This is in fact a common use case for development.  Other platforms /
> SoCs do use fastboot in non-Android development as how to pass in a new
> testing kernel / initrd / device tree combo.

AFAIK, there's no support in fastboot for a dt yet. You can only give
it a kernel with an appended DT.

Maxime


-- 
Maxime Ripard, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com
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