[U-Boot] [PATCH] ext2load: increase read speed

[Jason Cooper]

On Wed, Apr 25, 2012 at 06:17:48PM -0700, Eric Nelson wrote:
> On 03/28/2012 07:37 AM, Jason Cooper wrote:
> >This patch dramatically drops the amount of time u-boot needs to read a
> >file from an ext2 partition.  On a typical 2 to 5 MB file (kernels and
> >initrds) it goes from tens of seconds to a couple seconds.
> >
> >All we are doing here is grouping contiguous blocks into one read.
> >
> >Boot tested on Globalscale Technologies Dreamplug (Kirkwood ARM SoC)
> >with three different files.  sha1sums were calculated in Linux
> >userspace, and then confirmed after ext2load.
> >
> >Signed-off-by: Jason Cooper<u-boot at lakedaemon.net>
> 
> Tested-by: Eric Nelson <eric.nelson at boundarydevices.com>

Thanks for testing!  I've copied your results into the commit and will
be doing a pull request shortly.

thx,

Jason.

> 
> Tested on i.MX6 Sabre Lite board loading a file of ~900k:
> 
> Without patch:
> 
> 	MX6QSABRELITE U-Boot > time ext2load sata 0:1 12000000
> /usr/lib/libperl.so.5.12.4 && crc32 12000000 $filesize
> 	Loading file "/usr/lib/libperl.so.5.12.4" from sata device 0:1 (hda1)
> 	958032 bytes read
> 	
> 	time: 0.414 seconds, 414 ticks
> 	CRC32 for 12000000 ... 120e9e4f ==> 550deec9
> 	
> With patch:
> 	MX6QSABRELITE U-Boot > time ext2load sata 0:1 12000000
> /usr/lib/libperl.so.5.12.4 && crc32 12000000 $filesize
> 	Loading file "/usr/lib/libperl.so.5.12.4" from sata device 0:1 (hda1)
> 	958032 bytes read
> 
> 	time: 0.205 seconds, 205 ticks
> 	CRC32 for 12000000 ... 120e9e4f ==> 550deec9