[U-Boot-Users] Software emulation exception on entry into RAM
wd at denx.de
Fri Jul 30 11:56:58 CEST 2004
In message <41099EFD.7060702 at rochester.rr.com> you wrote:
> I am implementing u-boot 1.0.2 on a custom 860P board and am getting a
> Software Emulation Exception
> (as reported by BDI2000) at the first access of RAM after code is copied
...whbich is most probably caused by incorrect initialization of the SDRAM.
> The SDRAM setup was copied from a working PSOS+ load running on this
> board. Successful burst
> reads have been verified with a logic analyzer. I can't easily get
> access to the logic analyzer for debugging
Did you verify with the LA which data was actually read from RAM
> I have defined SRAM to be at 0x0 and I get the same results.
I don't understand what you mean here.
> I have searched the list and have found cases where SDRAM
> initialization/burst read configurations have been
> blamed. Based on success w/ PSOS+, I don't think this is my problem.
I still think it is. I have seen PSOS systems running happily on
systems where a real OS would reliably crash because of memory
Software Engineering: Embedded and Realtime Systems, Embedded Linux
Phone: (+49)-8142-4596-87 Fax: (+49)-8142-4596-88 Email: wd at denx.de
You Don't Have To Be 'Damned' To Work Here, But It Helps!!!
- Terry Pratchett, _Eric_
More information about the U-Boot