[ECOS] Redboot image load via PCI bus?

Snider, Marc Marc.Snider@icn.siemens.com
Thu Nov 6 18:10:00 GMT 2003


Makes sense, Gary.  Thanks for the pointers...  Assuming I'm otherwise
entirely comfortable with what version 1.3.1 provides, will I need to go to
(do you advise) version 2.0 before making these mods or is 1.3.1 adequate?  


Thanks again,
Marc


-----Original Message-----
From: Gary Thomas [mailto:gary@mlbassoc.com]
Sent: Thursday, November 06, 2003 12:42 PM
To: Snider, Marc
Cc: 'ecos-discuss@sources.redhat.com'
Subject: RE: [ECOS] Redboot image load via PCI bus?


On Thu, 2003-11-06 at 10:37, Snider, Marc wrote:
> My thought was to provide the standard I/O device driver routines (open,
> close, read...) on top of the PCI accesses and thus shield the higher
layer
> loader code.  I'd make it look like the image data was coming from
somewhere
> else like the flash.  It looks like do_load doesn't care where the image
> data comes from as long as the native format (in my case likely SREC) is
> maintained...
> 
> Yes, the host does have access to the memory on the target system, but it
> would be preferable to pull the data from the host as opposed to pushing
it
> from there to the target...
> 

Understood.  If you look carefully at how the "load" command works,
you won't need to make *any* changes directly to it, but just add a
new I/O method.  Also, I'd suggest that you put your new PCI method
in your platform HAL - there is no need to mess about with the core
of RedBoot.

note: a lot of care has been taken (by me) to allow such extensions
without any [direct] changes to the RedBoot tree.  

... Ah, the joy of tables.

> Marc
> 
> 
> -----Original Message-----
> From: Gary Thomas [mailto:gary@mlbassoc.com]
> Sent: Thursday, November 06, 2003 11:46 AM
> To: Snider, Marc
> Cc: 'ecos-discuss@sources.redhat.com'
> Subject: Re: [ECOS] Redboot image load via PCI bus?
> 
> 
> On Thu, 2003-11-06 at 09:45, Snider, Marc wrote:
> > Is there a canned method implemented somewhere for loading an image via
> the
> > PCI bus (from another host), as opposed to using the network or loading
> from
> > flash?   I'd like to load an image from a control host across the PCI
bus
> > and then burn it to flash...   I'm assuming that if there isn't then
I'll
> > need to modify the do_load command and provide a set of I/O routines
that
> > map PCI accesses into standard I/O convention...
> > 
> > I'm on a PowerPC440 platform, if the platform matters.
> 
> What method would you use to access the image via the PCI?
> Can your host access the memory on the board?
> 
> -- 
> Gary Thomas <gary@mlbassoc.com>
> MLB Associates
-- 
Gary Thomas <gary@mlbassoc.com>
MLB Associates

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