RE: [ECOS] Load Redboot RAM through serial

["Trenton D. Adams" <tadams at theone dot dnsalias dot com>]

How would you go about doing this though?  The bootloader code in ROM is
not changeable and only loads 2K of code into SRAM for running.  Does
eCos/RedBoot have a utility <2K that will load RedBoot into RAM and run
it?

-----Original Message-----
From: Gary Thomas [mailto:gthomas@redhat.com] 
Sent: September 20, 2001 4:27 PM
To: Trenton D. Adams
Cc: 'Fabrice Gautier'; 'eCos Discussion'
Subject: RE: [ECOS] Load Redboot RAM through serial


On Fri, 2001-09-21 at 01:08, Trenton D. Adams wrote:
> I was thinking more along the lines of actually starting it through 
> the serial port.  eg. loading it as the boot program.  I need this 
> because we're changing FLASH from intel to AMD am29xxxxx.  So, using 
> another boot monitor won't work because you have to be able to program

> flash in the first place.  Since all the boot/debug monitors for the 
> board are designed for the flash that's on the development board, I 
> won't be able to use that flash.
> 
> In particular, I would like to be able to start a RAM version of 
> RedBoot by loading it through the serial port.  I could then modify 
> just the Redboot source to use the FLASH that we are using.  This 
> would be all I need since I could then write a ROM version of redboot 
> to FLASH for startup.
> 

We go through exactly this process all the time as part of bringing up
RedBoot on new hardware.

Have you tried it?  If so, what problems did you have?

> -----Original Message-----
> From: Fabrice Gautier [mailto:Fabrice_Gautier@sdesigns.com]
> Sent: Wednesday, September 19, 2001 10:25 PM
> To: 'Trenton D. Adams'; 'eCos Discussion'; 'Trenton D. Adams'; 'eCos
> Discussion'
> Subject: RE: [ECOS] Load Redboot RAM through serial
> 
> 
> 
> 
> > -----Original Message-----
> > From: Trenton D. Adams [mailto:tadams@theone.dnsalias.com]
> > Subject: [ECOS] Load Redboot RAM through serial
> > 
> > Is it possible to have Redboot start right after being loaded 
> > through the serial port on an edb7xxx board?  I know, anything is 
> > possible! ;)
> > 
> > Has anyone ever done this?
> 
> I've done this on the ARM Integrator Board.
> 
> I Used default redboot template then change startup to RAM. Loaded the

> image with the ARM Boot Monitor et voila...
> 
> Regards,
>