[ECOS] Redboot image load via PCI bus?

Gary Thomas gary@mlbassoc.com
Thu Nov 6 18:13:00 GMT 2003


On Thu, 2003-11-06 at 11:13, Snider, Marc wrote:
> 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?  
> 

1.3.1 is too out of date - don't even think about it.

Use the latest from CVS - that's the best approach.

> 
> 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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