UBoot

Hi Scott,

Okay i'm using a II/f

I&#39;m booting from EPCS (see all the numerous other threads http://forum.niosforum.com/work2/style_emoticons/<#EMO_DIR#>/wink.gif !! )

UBoot is in the EPCS, it , as far as I can tell, comes up cleanly. Certainly all the

prompts/commands seem to work so I don&#39;t think it&#39;s corruption there. (Although

of interest I did get a couple of times an illegal instruction trap inside uboot but that

went away and hasn&#39;t returned).

UBoot is copied into the high end of SDRAM,

My application comes from FLASH at location 0, obviously therefore the flash and sdram ram

pins are separate (basically it&#39;s a cyclone dev board). It gets copied into the bottom of SDRAM replacing the uboot exception trampoline. I&#39;ve manually, and correctly, relocated the .entry section of the app from what would have been epcs base to SDRAM base, so that the instruction cache is initialised correctly. Like I say though it is weird in that it sometimes works and othertimes not.

When bootm fails it just hangs, sits there and does the knitting! http://forum.niosforum.com/work2/style_emoticons/<#EMO_DIR#>/wink.gif , no error messages

of any sort.

If I do an iminfo on location 0 it checks out fine, CRC is all good etc.

Additionally if I remove the final call to kernel() in do_bootm_linux and do a cmp.b

between the SDRAM data and my image (+ 0x40 to allow for the image header) it all

checks out as correct, i.e. it was copied correctly.

I&#39;m wondering if it is a cache problem with the data cache (containing the copied

instructions) not being flushed before calling?