Prior to Release 2 of the MIPS32 Architecture, the exception vectors were fixed at a base of 0x80000000, which put the vectored interrupt offset at 0x80000200. The MIPS32 4Kc processor is an implementation of Release 1 of the Architecture, so it has a fixed exception vector base. (Note that the MIPS32 4KEc - the added 'E' is significant - implements Release 2 so in case you mis-typed, there is a solution using the 4KEc). So with a Release 1 implementation, your only really solution is to put a jump at 0x80000200 to where you want the code to be. I suspect that this isn't really what you want. /gmu On Thu, 2004-10-14 at 18:29, Kang wrote: > Hello buddies, > > I am working on a MIPS4Kc based reference design board. For some > reason, I need to force the interrupt vector location to address > 0x91xx0200 instead of 0x80000200 in arch/mips/kernel/traps.c. The > kernel was loaded into 0x91xxxxxx space as well. > > The kernel hung just after the interrupt was first time opened, after > sti(), before calibrate_delay() in init/main.c. It was weird that I > didn't see any problem if I put interrupt vector to location > 0x80000200 while all other exception vectors to 0x91xxxxxx. > > Was interrupt vector location hardcode to the address 0x80000200? Or > some other place I need to change to walk around it. Any idea? > > Thanks a bunch for your help. > > Leo -- Michael Uhler, Chief Technology Officer MIPS Technologies, Inc. Email: uhler@xxxxxxxx 1225 Charleston Road Mountain View, CA 94043
