Re: [ECOS] Running from Redboot

[Unni Nair <manjunni at yahoo dot com>]

Gary:

Thank you very much for your prompt responses. I will
modify my code to add a ROM section (located in the
ram) for redboot and give it another try. I will keep
the group posted...

Thanks again

 
--- Gary Thomas <gary@mlbassoc.com> wrote:
> On Fri, 2003-08-15 at 14:30, Unni Nair wrote:
> > I only have one mlt file (ram mode) since I was
> using
> > only the ram for both redboot and the ecos
> > application. Maybe this is my problem and ecos
> expects
> > to see separate mlt files irrespective of where
> the
> > code and data resides..
> > 
> 
> Indeed.  RedBoot normally runs from ROM or ROMRAM
> mode.
> There is normally only one RAM configuration - that
> used
> for normal applications.  This is how we can
> stratify
> memory between the two different worlds.
> 
> I know that the adder platform that you started from
> worked
> this way - since I wrote all the support for that
> platform!
> 
> > 
> > --- Gary Thomas <gary@mlbassoc.com> wrote:
> > > On Fri, 2003-08-15 at 14:24, Unni Nair wrote:
> > > > When I increased the size of the
> reserved_for_rom,
> > > the
> > > > available ram reported by redboot (start
> address)
> > > was
> > > > changed to reflect the change. 
> > > > 
> > > > Unfortunately the problem I am facing is with
> the
> > > ECOS
> > > > + application linking process, relocating the
> code
> > > to
> > > > be loaded to the end of the reserved_for_rom
> > > section
> > > > (which is not where the available ram
> resides).
> > > > 
> > > 
> > > You changed the wrong file - change this value
> in
> > > the MLT
> > > files for RAM mode startup.
> > > 
> > > > Unni
> > > > 
> > > > > Hello Gary:
> > > > > 
> > > > > Unfortunately I do not know how to post a
> > > followup
> > > > to
> > > > > your response, hence emailing you directly.
> > > > 
> > > > In that case, why not just send this to the
> list
> > > (and
> > > > maybe
> > > > copy it to me)?
> > > > 
> > > > > 
> > > > > The reserved_for_rom section is empty (I
> > > actually
> > > > > modified the adder board code to suit my
> needs).
> > > > > Apparently redboot is using areas after the
> > > > > reserved_for_room section to store
> additional
> > > > > sections. These details are not taken into
> > > > > consideration when I recompile for ECOS
> > > (default)
> > > > and
> > > > > the linker is generating code located
> > > immediately
> > > > > after the reserved_for_rom (empty section).
> I do
> > > not
> > > > > know if the reserved_for_rom section is
> needed? 
> > > > 
> > > > It is indeed - that's how the .ldi file
> indicates
> > > what
> > > > memory is
> > > > used by RedBoot and what memory can be used by
> the
> > > > application.
> > > > 
> > > > Looking at the real 'adder' MLT file:
> > > > SECTIONS
> > > > {
> > > >     SECTIONS_BEGIN
> > > >     CYG_LABEL_DEFN(__reserved_vectors) = 0; .
> =
> > > > CYG_LABEL_DEFN(__reserved_vectors) + 0x3000;
> > > >     CYG_LABEL_DEFN(__reserved_vsr_table) =
> ALIGN
> > > > (0x10); . =
> CYG_LABEL_DEFN(__reserved_vsr_table) +
> > > > 0x200;
> > > >     CYG_LABEL_DEFN(__reserved_virtual_table) =
> > > ALIGN
> > > > (0x10); . =
> > > CYG_LABEL_DEFN(__reserved_virtual_table) +
> > > > 0x100;
> > > >     CYG_LABEL_DEFN(__reserved_for_rom) = ALIGN
> > > (0x10);
> > > > . = CYG_LABEL_DEFN(__reserved_for_rom) +
> 0x3cd00;
> > > >     SECTION_vectors (ram, ALIGN (0x10),
> > > LMA_EQ_VMA)
> > > >     SECTION_text (ram, ALIGN (0x4),
> LMA_EQ_VMA)
> > > >     SECTION_fini (ram, ALIGN (0x4),
> LMA_EQ_VMA)
> > > >     SECTION_rodata1 (ram, ALIGN (0x8),
> LMA_EQ_VMA)
> > > >     SECTION_rodata (ram, ALIGN (0x8),
> LMA_EQ_VMA)
> > > >     SECTION_fixup (ram, ALIGN (0x4),
> LMA_EQ_VMA)
> > > >     SECTION_gcc_except_table (ram, ALIGN
> (0x1),
> > > > LMA_EQ_VMA)
> > > >     SECTION_data (ram, ALIGN (0x8),
> LMA_EQ_VMA)
> > > >     SECTION_sbss (ram, ALIGN (0x4),
> LMA_EQ_VMA)
> > > >     SECTION_bss (ram, ALIGN (0x10),
> LMA_EQ_VMA)
> > > >     CYG_LABEL_DEFN(__heap1) = ALIGN (0x8);
> > > >     SECTIONS_END
> > > > }
> > > > 
> > > > If you do the calculations, you'll see that
> the
> > > > "__reserved_for_rom" segment
> > > > extends up through 0x80000.  If your RedBoot
> > > reports
> > > > an address higher than
> > > > this, just change the 0x3cd00 above to an
> > > appropriate
> > > > value.  E.g. 0x4cd00
> > > > would start the user applications 
> > > > 
> > > > __________________________________
> > > > Do you Yahoo!?
> > > > Yahoo! SiteBuilder - Free, easy-to-use web
> site
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> > > -- 
> > > Gary Thomas <gary@mlbassoc.com>
> > > MLB Associates
> > > 
> > 
> > 
> > __________________________________
> > Do you Yahoo!?
> > Yahoo! SiteBuilder - Free, easy-to-use web site
> design software
> > http://sitebuilder.yahoo.com
> -- 
> Gary Thomas <gary@mlbassoc.com>
> MLB Associates
> 


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