[U-Boot] Flatten device tree & PPC linux

[U-Boot] Flatten device tree & PPC linux

[Fundu]

> > i'm using a the taishan board u-boot 1.2.0 and
> linux 2.4
>
> Uh, OK.  Those are both pretty darn old by now.....
>
> > does u-boot-1.2.0 pass a flatten device tree to the
> kernel ?
>
> Maybe.
how do i make confirm this ?
TIA



      

[U-Boot] Flatten device tree & PPC linu

[Paul Gortmaker]

On Thu, Aug 14, 2008 at 4:10 PM, Fundu <fundu_1999@yahoo.com> wrote:
>
>> > i'm using a the taishan board u-boot 1.2.0 and
>> linux 2.4
>>
>> Uh, OK.  Those are both pretty darn old by now.....
>>
>> > does u-boot-1.2.0 pass a flatten device tree to the
>> kernel ?
>>
>> Maybe.
> how do i make confirm this ?
> TIA

I believe the 4xx boards were probably not using FDT back then.
You can confirm by "help bootm" -- if it only takes the kernel
addy and the optional ramdisk addy, then it is non-FDT.

But whether or not u-boot is FDT capable is pretty much moot
point if you are on a v2.4.x kernel, as they don't use FDT.

P.

>
>
>
>
> _______________________________________________
> U-Boot mailing list
> U-Boot at lists.denx.de
> http://lists.denx.de/mailman/listinfo/u-boot
>

[U-Boot] Flatten device tree & PPC linu

[Fundu]

Thanks for clearing that up.

One other question, if i update  to u-boot 1.3.4 or whatever is the latest, can i configure so that i doesn't use FDT to boot kernel ?

TIA




--- On Thu, 8/14/08, Paul Gortmaker <paul.gortmaker@gmail.com> wrote:

> From: Paul Gortmaker <paul.gortmaker@gmail.com>
> Subject: Re: [U-Boot] Flatten device tree & PPC linu
> To: fundu_1999 at yahoo.com
> Cc: u-boot at lists.denx.de
> Date: Thursday, August 14, 2008, 6:35 PM
> On Thu, Aug 14, 2008 at 4:10 PM, Fundu
> <fundu_1999@yahoo.com> wrote:
> >
> >> > i'm using a the taishan board u-boot
> 1.2.0 and
> >> linux 2.4
> >>
> >> Uh, OK.  Those are both pretty darn old by
> now.....
> >>
> >> > does u-boot-1.2.0 pass a flatten device tree
> to the
> >> kernel ?
> >>
> >> Maybe.
> > how do i make confirm this ?
> > TIA
> 
> I believe the 4xx boards were probably not using FDT back
> then.
> You can confirm by "help bootm" -- if it only
> takes the kernel
> addy and the optional ramdisk addy, then it is non-FDT.
> 
> But whether or not u-boot is FDT capable is pretty much
> moot
> point if you are on a v2.4.x kernel, as they don't use
> FDT.
> 
> P.
> 
> >
> >
> >
> >
> > _______________________________________________
> > U-Boot mailing list
> > U-Boot at lists.denx.de
> > http://lists.denx.de/mailman/listinfo/u-boot
> >


      

[U-Boot] Flatten device tree & PPC linu

[Wolfgang Denk]

Dear Fundu,

In message <805245.7882.qm@web63402.mail.re1.yahoo.com> you wrote:
> Thanks for clearing that up.
> 
> One other question, if i update  to u-boot 1.3.4 or whatever is the latest, can i configure so that i doesn't use FDT to boot kernel ?

You don't have to configure that - it just depoends on how  you  boot
the  Linux  kenrel  image - either you pass a device tree address (as
the third argument to the bootm command), or you don't.

Best regards,

Wolfgang Denk

-- 
DENX Software Engineering GmbH,     MD: Wolfgang Denk & Detlev Zundel
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd at denx.de
Research is what I'm doing when I don't know what I'm doing.
                                                 -- Wernher von Braun

[U-Boot] Flatten device tree & PPC linu

[Jon Loeliger]

Wolfgang Denk wrote:
> Dear Fundu,
> 
> In message <805245.7882.qm@web63402.mail.re1.yahoo.com> you wrote:
>> Thanks for clearing that up.
>>
>> One other question, if i update  to u-boot 1.3.4 or whatever is the latest, can i configure so that i doesn't use FDT to boot kernel ?
> 
> You don't have to configure that - it just depoends on how  you  boot
> the  Linux  kenrel  image - either you pass a device tree address (as
> the third argument to the bootm command), or you don't.

True.  But if your question was really "Can I have PowerPC board
boot without a Device Tree?", then no, you can't unless you work
really hard in the wrong direction. :-)

All PowerPC converted to using the Device Tree for booting over
two years ago now.

jdl