Re: [ECOS] MPC860 eCos application

[Gary Thomas <gary@mlbassoc.com>]

On Fri, 2003-12-12 at 07:56, nprasad3@gmu.edu wrote:
> 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

What does "clean build" mean?  Try starting absolutely fresh,
in a new directory, etc.  See the earlier thread today labeled
  "Re: [ECOS] Run Redboot from flash"
for details on how to do this.

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


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