RE: Re: Load an MPC555 register with address

Thanks Mch! That works fine.

 

For some reason the lis/ori doesn't work, but these addi instructions work
great. There must be some limitation on the lis/ori that I'm not aware of,
need to read the manual more.

 

I tried it with the % sign (%r1) and without it. It seems to work either
way. What is the significance of them?

 

Thanks again for your help,

 

Dave

 

 

  _____  

From: [email protected] [mailto:[email protected]] On Behalf Of
marausch01
Sent: Sunday, April 17, 2005 10:35 PM
To: [email protected]
Subject: [MPC500] Re: Load an MPC555 register with address

 


--- In [email protected], "David Eicher" <sailors3@c...> wrote:
> Hello list,
> 
> New thought on this,  I tried the following assembly code for
> the MPC555, it gave me an error that reads something like:
> 
> Error: Unsupported relocation against __SP_INIT.
> 
>             lis                     r1,__SP_INIT@ha
>             ori                     r1, r1,__SP_INIT
> 

Here is an example of working code:

# Initialize stack pointer r1 to value in linker command file
   addis %r11,%r0,__stack_base@ha
   addi  %r1,%r11,__stack_base@l

# Initialize r13 to sdata base (provided by linker)
   addis %r13,%r0,_SDA_BASE_@ha
   addi  %r13,%r13,_SDA_BASE_@l

# Initialize r2 to sdata2 base (provided by linker)
   addis %r2,%r0,_SDA2_BASE_@ha
   addi  %r2,%r2,_SDA2_BASE_@l

-- 
Mch






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