[U-Boot-Users] Uncompression of image takes time.

[Jerry Van Baren]

Adarsh Babu wrote:
> Hi,
> 
> I have an image which is 1.5MB in size after compression, thats is done for 
> MCF5271. When i try to load this on a MCF5271 eval board using u-boot 1.2.0 it 
> takes about 25 secs to just uncompress. I loaded a MCF5272 eval board with U-
> Boot 1.2.0 and then tried to start the same image(which was done for MCF5271). 
> It was very fast. The checksum verification finish off in a second and 
> uncompression in 10 seconds ! 
> 
> The clock configurations for both are provided below:
> M5272C3.h
> define CFG_HZ			1000
> #define CFG_CLK			66000000
> 
> M5271EVB.h:
> define CFG_HZ			1000000
> #define CFG_CLK			100000000
> 
> What should I do to get the image to uncompress faster in the MCF5271 EVB?
> 
> Regards,
> Adarsh.

1) Your CFG_HZ looks like a problem: it should be 1000 and your timer 
tick interrupt should be running 1000 times per second to match.  If you 
are indeed ticking 1,000,000 times per second, you are spending all of 
your processor time in your timer ISR.

2) Why is your image 1.5MB?  I suspect you have large unused areas of 
memory (typically due to ISR vectors, followed by a huge unused gap, 
followed by the code).  If you fix your image size (assuming it is 
broken), the checksum and uncompress will be much faster.

gvb