coreboot for Advantech SOM-4461

[junaid saleem]

Hello ,

I have been trying to port coreboot on advantech SOM 4461, with the
following specifications.

Processor: Intel ® Atom N270
Chipset : Intel 945GSE/ ICH7M
Memory: DDR2 (2GB)

i was not able to find  the board in the list of supported hardware as
given in link
https://www.coreboot.org/Category:Tutorials.

Can anybody suggest which board should i select in make menuconfig ?

Thanks.

Regards,
--Jun

[Angel Pons]

Hello,

On Tue, Dec 18, 2018 at 9:27 AM junaid saleem  wrote:
> Hello ,
>
> I have been trying to port coreboot on advantech SOM 4461, with the following specifications.
>
> Processor: Intel ® Atom N270
> Chipset : Intel 945GSE/ ICH7M
> Memory: DDR2 (2GB)

AFAIK, these chips are supported, which is good. I would also check
which SuperIO your board has (pictures tell me it's a Winbond
W83627DHG).
> i was not able to find  the board in the list of supported hardware as given in link
> https://www.coreboot.org/Category:Tutorials.

That list is not up-to-date at all (nor the wiki itself). Please check
this page instead:
https://coreboot.org/status/board-status.html
Your board does not appear there either, though.
> Can anybody suggest which board should i select in make menuconfig ?

Ideally, you would want to select your board. Since it is not in
menuconfig, you need to port coreboot to your board. I suggest basing
your port on intel/d945gclf, but this does not mean using the code
as-is! Some things that must be changed:
- gpio.c: use data from inteltool. This is IMPORTANT, misconfiguration
can result in SHORTCIRCUITS!
- Since the SuperIO is different, all the SuperIO-specific code must
be changed. You can use another board with the same SuperIO as a
reference.
- romstage.c: there's lots of mainboard-specific stuff in there,
mainly values to be changed.
- devicetree.cb: PCI device numbers don't usually change between the
same chipsets, but whether they are enabled does depend on the board.
Subsystem IDs are specific too.
- hda_verb.c: this is the audio device pin config.

Do note this is not an exhaustive list. There is also the old
mainboard porting guide, which may not apply to current code:
https://www.coreboot.org/Motherboard_Porting_Guide

I also noticed an ITE chip on the underside of the module, I believe
it's a PCI-to-ISA bridge but I can't see the part number very well (a
similar board has an IT8888E). Moreover, as far as I can see, this
module is to be used on some other board which may have additional
chips. I am not sure whether these chips should be considered part of
the mainboard.
> Thanks.
>
> Regards,
> --Jun
>
> coreboot mailing list: [e-mail]
> https://mail.coreboot.org/mailman/listinfo/coreboot

[junaid saleem]

Thank you for your prompt response.

The board which you suggested looks good for our purpose but i am stuck as
i am not able to find the corresponding intel fsp.
Would you mind pointing out the name of the said FSP.
or
  Is there any other method / documents  which provides the solution.
I found the following document. "
https://www.coreboot.org/Board:intel/d945gclf"
again it  is the old link!  I am a bit confused , as where is the new
updated link?
Also this link does not inform about any FSP ?
Any suggestions would be appreciated.
Sincerely,
JunSal

On Tue, Dec 18, 2018 at 6:57 AM Angel Pons  wrote:
> Hello,
>
> On Tue, Dec 18, 2018 at 9:27 AM junaid saleem 
> wrote:
> > Hello ,
> >
> > I have been trying to port coreboot on advantech SOM 4461, with the
>
> following specifications.
> > Processor: Intel ® Atom N270
> > Chipset : Intel 945GSE/ ICH7M
> > Memory: DDR2 (2GB)
>
> AFAIK, these chips are supported, which is good. I would also check
> which SuperIO your board has (pictures tell me it's a Winbond
> W83627DHG).
> > i was not able to find  the board in the list of supported hardware as
>
> given in link
> > https://www.coreboot.org/Category:Tutorials.
>
> That list is not up-to-date at all (nor the wiki itself). Please check
> this page instead:
> https://coreboot.org/status/board-status.html
> Your board does not appear there either, though.
> > Can anybody suggest which board should i select in make menuconfig ?
>
> Ideally, you would want to select your board. Since it is not in
> menuconfig, you need to port coreboot to your board. I suggest basing
> your port on intel/d945gclf, but this does not mean using the code
> as-is! Some things that must be changed:
> gpio.c: use data from inteltool. This is IMPORTANT, misconfiguration
>
> can result in SHORTCIRCUITS!
> Since the SuperIO is different, all the SuperIO-specific code must
>
> be changed. You can use another board with the same SuperIO as a
> reference.
> romstage.c: there's lots of mainboard-specific stuff in there,
>
> mainly values to be changed.
> devicetree.cb: PCI device numbers don't usually change between the
>
> same chipsets, but whether they are enabled does depend on the board.
> Subsystem IDs are specific too.
> hda_verb.c: this is the audio device pin config.
>
> Do note this is not an exhaustive list. There is also the old
> mainboard porting guide, which may not apply to current code:
> https://www.coreboot.org/Motherboard_Porting_Guide
>
> I also noticed an ITE chip on the underside of the module, I believe
> it's a PCI-to-ISA bridge but I can't see the part number very well (a
> similar board has an IT8888E). Moreover, as far as I can see, this
> module is to be used on some other board which may have additional
> chips. I am not sure whether these chips should be considered part of
> the mainboard.
> > Thanks.
> >
> > Regards,
> > --Jun
> >
> > coreboot mailing list: [e-mail]
> > https://mail.coreboot.org/mailman/listinfo/coreboot

[Angel Pons]

Hello,

On Wed, Dec 19, 2018, 11:33 junaid saleem <[e-mail] wrote:
> Thank you for your prompt response.
>
> The board which you suggested looks good for our purpose but i am stuck as
> i am not able to find the corresponding intel fsp.
> Would you mind pointing out the name of the said FSP.
> or
>   Is there any other method / documents  which provides the solution.
> I found the following document. "
> https://www.coreboot.org/Board:intel/d945gclf"
> again it  is the old link!  I am a bit confused , as where is the new
> updated link?
> Also this link does not inform about any FSP ?
> Any suggestions would be appreciated.
> Sincerely,
> JunSal

There is no need to use FSP (nor any other coreboot blob) with this
platform. There is open-source code to initialize whatever these chips
need. I don't think FSP for this chipset ever existed, either.

Regarding updated documents, somebody with that board would have to check
what still applies and what does not.

Best regards,

Angel Pons
>