[PATCH 1/2] ARM: Add Kconfig option to use mkimage -T kernel_noload
Russell King - ARM Linux
linux at arm.linux.org.uk
Wed Feb 29 15:29:13 EST 2012
On Thu, Mar 01, 2012 at 09:25:12AM +1300, Andre Renaud wrote:
> Hi Russell,
> >> I may have missed part of this, but isn't one of the points regarding
> >> this that the zImage decompressor always runs with data cache disabled,
> >
> > Most certainly not. We've had the data cache enabled for years and
> > years. And I mean 10+ years. We may have been lacking support on
> > some CPUs, but that was because of lack of contributions.
> >
> >> resulting in a slow decompress, where as if the U-Boot decompressor is
> >> used (ie, gzipping the Image, and telling U-Boot to decompress), then it
> >> can run with caches enabled, improving boot speed?
> >
> > That's pure FUD.
>
> I don't want to open a can of worms on this, and I certainly haven't
> looked into the image decompressor within the Linux kernel, but from a
> boot speed point of view we certainly see a significant speed
> improvement switching from zImage to gzipped-Image. Do you know which
> platforms include the data-cache support in the decompressor?
All.
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