Re: [ECOS] Reboot flashing from eCos system?

[Gary Thomas <gary@mlbassoc.com>]

On Mon, 2005-08-15 at 18:28 +0200, Stefan Sommerfeld wrote:
> Hi,
> 
> coming back to this, because i really need a solution. I tried to load a 
> RAM based RedBoot out of my ROM based RedBoot without any luck. Is there a 
> way to build a "CYGSEM_HAL_USE_ROM_MONITOR" RAM based RedBoot? I made a 
> RedBoot which allows me to flash the first sector, but it reports: "Sorry, 
> 'RedBoot' is a reserved image and cannot be deleted".
> 

There should not be any reason to do so.  Simply build the RAM version
of RedBoot, including the FLASH (and maybe network) drivers.  Then
when you run it, you'll have complete control and can write to any
portion of the FLASH.  This is common practice - I do it all the time.

Note: there should not be any reason to try and delete the image called
"RedBoot" (which is obviously what you tried although you didn't say 
so).  You can safely overwrite it with the new contents.  For example,
after booting into a RAM version:

  RedBoot> lo -b 0x100000 RedBoot.ROM
  RedBoot> fi cr RedBoot

If you want to rewrite the whole FLASH, you could do something like:

  RedBoot> lo -b 0x100000 -r FLASH.image
  RedBoot> fi wr -f 0xFC000000 -b 0x100000 -l 0x1000000

(of course, these values and addresses are just examples, you'd need
to fill in the specifics for your platform yourself).  If you don't
have enough RAM to hold the whole FLASH image, simply perform multiple
load/fi command pairs to cover the whole thing.

> 
> ----- Original Message ----- 
> From: "Gary Thomas" <gary@mlbassoc.com>
> To: "Stefan Sommerfeld" <zerocom@cs.tu-berlin.de>
> Cc: "eCos Discussion" <ecos-discuss@ecos.sourceware.org>
> Sent: Donnerstag, 21. Juli 2005 00:49
> Subject: Re: [ECOS] Reboot flashing from eCos system?
> 
> 
> > On Wed, 2005-07-20 at 23:38 +0200, Stefan Sommerfeld wrote:
> >> Hi,
> >> >>
> >> >> Is it possible to re-flash reboot from a running ecos system? I need 
> >> >> to
> >> >> flash a whole system (inclusive reboot) for production, but i'm not 
> >> >> sure
> >> >> if
> >> >> i can flash reboot besides the normal system (ecos and configs).
> >> >
> >> > Yes, if your RedBoot runs in ROMRAM mode, then this would be safe.
> >>
> >> Thanks ... you're understanding me. I, of course, talked about RedBoot.
> >>
> >> Any chance to do this with a ROM RedBoot? I have a pre-installed RedBoot 
> >> on
> >> a module which i want to replace. I'm thinking about disabling all 
> >> IRQ's,
> >> MMU tables should already be in RAM, so if there's no special locking
> >> mechanism in RedBoot, flashing should work.
> >
> > Probably *not* safe as there are many mechanisms within RedBoot that
> > your application will rely upon, unless you disable
> >   CYGSEM_HAL_USE_ROM_MONITOR

-- 
------------------------------------------------------------
Gary Thomas                 |  Consulting for the
MLB Associates              |    Embedded world
------------------------------------------------------------


-- 
Before posting, please read the FAQ: http://ecos.sourceware.org/fom/ecos
and search the list archive: http://ecos.sourceware.org/ml/ecos-discuss