RE: [ECOS] Redboot image load via PCI bus?

RE: [ECOS] Redboot image load via PCI bus?

[Snider, Marc]

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...

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

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

RE: [ECOS] Redboot image load via PCI bus?

[Gary Thomas]

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


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

RE: [ECOS] Redboot image load via PCI bus?

[Gary Thomas]

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


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

RE: [ECOS] Redboot image load via PCI bus?

[Snider, Marc]

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

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

Re: [ECOS] Redboot image load via PCI bus?

[Gary Thomas]

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


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

[ECOS] Redboot image load via PCI bus?

[Snider, Marc]

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.

Thanks,
Marc


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