[ECOS] MPC860 eCos application

Gary Thomas gary@mlbassoc.com
Fri Dec 12 09:20:00 GMT 2003


On Thu, 2003-12-11 at 18:55, nprasad3@gmu.edu wrote:
> Hi,
> 
> I have redboot working and i'm trying to write a simple application (just prints Hello eCos World!) but I seem to be missing something as redboot fails to load default .srec with the following message:
> 
> *** Abort! Attempt to load S-record to address: 0xfff00000, which is not in RAM
> 
> 1. Built libtarget.a (Work with ROM Monitor, Startup Mode : RAM) - target.ld still has references to rom.
> STARTUP(vectors.o)
> ENTRY(__exception_reset)
> INPUT(extras.o)
> GROUP(libtarget.a libgcc.a libsupc++.a)
> MEMORY
> {
>     ram : ORIGIN = 0x00001000, LENGTH = 0x1FFF000
>     rom : ORIGIN = 0xfff00000, LENGTH = 0x800000
> }
> 
> SECTIONS
> {
>     .vectors 0xfff00000 : { . = .; KEEP(*(.vectors)) } > rom
>    .. etc (bunch of references to rom)
> }
> 
> 2. I modified the target.ld to change rom references to ram, [0xfff0000 -> 0x00007050] as redboot message is as [RAM: 0x00001000-0x02000000, 0x00007050-0x01fff000 available] and redboot loads the .srec file but my application does not run (*probably* its just the wrong printf i.e. target.ld is producing a copy of the printf whose state is different from the one redboot is using).
> 
> How can I make my application refer to code that's in ROM (redboot has the printf which is working) but run from RAM? 

Try generating a whole new build tree just for this.  Trying to adjust
one from ROM to RAM mode is error-prone.

-- 
Gary Thomas <gary@mlbassoc.com>
MLB Associates


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