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

[Jason Cooper]

On Thu, Apr 26, 2012 at 02:54:51PM +0200, Thierry Reding wrote:
> * 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>
> 
> Before:
> 
> 	Tegra2 (Medcom) # time ext2load mmc 0 0x17000000 /boot/uImage
> 	Loading file "/boot/uImage" from mmc device 0:1 (xxa1)
> 	5609104 bytes read
> 
> 	time: 4.638 seconds, 4638 ticks
> 	Tegra2 (Medcom) # crc32 0x17000000 559690
> 	CRC32 for 17000000 ... 1755968f ==> 158788be
> 
> After:
> 
> 	Tegra2 (Medcom) # time ext2load mmc 0 0x17000000 /boot/uImage
> 	Loading file "/boot/uImage" from mmc device 0:1 (xxa1)
> 	5609104 bytes read
> 
> 	time: 0.317 seconds, 317 ticks
> 	Tegra2 (Medcom) # crc32 0x17000000 559690
> 	CRC32 for 17000000 ... 1755968f ==> 158788be
> 
> I can also successfully load the loaded uImage to a prompt, so:
> 
> Tested-by: Thierry Reding <thierry.reding at avionic-design.de>

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

thx,

Jason.