download kernel into ram by u-boot

Hi mountain8848,

Sounds like a timer configuration issue. Check your config file to make sure the

timer macros are set correctly for your hardware configuration. Specifically,

check:

CFG_NIOS_TMRMS - the number of milliseconds per interrupt.

CFG_NIOS_TMRCNT - define this if you want to change the timer count register (e.g. to

slow down a high res timer).

CFG_HZ - the timer frequency.

In general, I recommend 10 msec or higher for the u-boot timer. There's usually

no need for anything faster in a bootloader ;-)

BTW: you can get a real rough estimate of your interrrupt period by simply using

the u-boot 'irq' command -- to view the number of interrupts over a period of time.

It's handy for simple estimates -- like making sure you're not off by a factor of 10.

Regards,

--Scott