[ECOS] MPC860 eCos application

nprasad3@gmu.edu nprasad3@gmu.edu
Fri Dec 12 15:07:00 GMT 2003


Gary,

I started with a clean build for libTarget (setup startup configuration as RAM) but it seems to be always picking up the <variant>_rom.ldi file (<variant>_ram.ldi looks a bit different and has no rom section). I have verified my .cdl file several times but for some strange reason during build the wrong .ldi file is included.

The configtool gui shows that it will use <variant>_ram.ldi but still <variant>_rom.ldi contents show up in target.ld

Thanks in advance
Nirmal


----- Original Message -----
From: Gary Thomas <gary@mlbassoc.com>
Date: Thursday, December 11, 2003 11:08 pm
Subject: Re: [ECOS] MPC860 eCos application

> 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
> 
> 
> -- 
> Before posting, please read the FAQ: 
> http://sources.redhat.com/fom/ecosand search the list archive: 
> http://sources.redhat.com/ml/ecos-discuss
> 
> 
> 


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