Adarsh Babu wrote:
Jerry Van Baren <gerald.vanbaren <at> smiths-aerospace.com> writes:
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.
- 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.
- 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
Hi Jerry,
I tried the same after modifying the CFG_HZ to 1000. But i still get the same result. Its as if there is no effect. The image size is 1.5MB becos its just not a kernel image. Its kernel + our application. Could this be a problem with the timer initialization and cofiguration?
Regards, Adarsh.
Hi Adarsh,
I don't have any M527x experience, so I cannot say anything with detail. Just changing CFG_HZ quite likely is not sufficient - usually you need to configure the timers in your hardware initialization routines and CFG_HZ simply reflects the choices you (or someone) made at initialization time.
If this is the case, and if you timer is really ticking at 1/100 your master clock rate, that would cause serious slowing of execution. You will have to chase down what CFG_HZ is used for and how your hardware timer is initialized. I simply don't have the knowledge or information.
HTH, gvb