Re: [ECOS] boot ecos from Assabet

[Gary Thomas <gthomas at redhat dot com>]

On Wed, 2001-10-17 at 13:47, Robert Lee wrote:
> Hi,
> 
> Thank Garry and Warren. 
        ^^^^^ Gary (one 'r' please)
> 
> I got redboot working; at least, I could ping some of
> the local machines.  I tried to load a program but got
> "access violation".
> 
> RedBoot> load hello -m tftp -h IP_address_of_Linux_PC
> Can't load 'hello': access violation
> 
> In the Linux PC, I have /tftpboot/hello (mode
> -r--r--r--)
> 
> What is access violation?  What did I violate?  How to
> fix it?  I searched the archive but did not find
> anybody with the same problem. (Am I so lucky :-(
> 

This is a problem with your TFTP setup.  Depending on the
system, you may actually have to specify the complete path,
not just the filename.  (In particular, on Red Hat 7.0 IIRC)
Try:
  RedBoot> load -h <host> /tftp/hello

The second thing is that RedBoot only knows how to load Motorola
S-record files.  You'll need to convert the 'hello' application
(which is an ELF image) before you can load it this way.
On your development host:
  % arm-elf-objcopy -O srec hello /tftpboot/hello.srec
Then tell RedBoot to load "/tftpboot/hello.srec"

> If I understand Garry correctly, I should change
> bin/install/include/pkgconf/system.h:
> #define CYG_HAL_STARTUP RAM
> 
> to 
> 
> #define CYG_HAL_STARTUP ROM
> 
> and run examples/Makefile to create a ROM version of
> hello.  Is this correct?

Not really.  You should edit the value in the 'ecos.ecc' (CDL
database file) and then rerun:
  % ecosconfig tree
  % make
Then you can go back and rebuild 'hello'.

Note that this will build an application, suitable for programming
into the Assabet ROM *** AS THE STARTUP APPLICATION **.  Once you
install it, that's all you'll be able to run on the board until
you reprogram the FLASH with a different image.

> 
> However, I still don't know how to boot ecos on
> Assabet.  Can I say that running Redboot is equivalent
> to booting ecos?  Honestly, I am very confused right
> now.

In a sense, yes, since RedBoot is just a [simple] eCos
application.  In general though, at least during the development
cycle, loading an eCos application is done using RedBoot as the
tool to get the application into memory for execution.