[U-Boot-Users] Booting Board Without BDI

[VanBaren, Gerald (AGRE)]

Another tip: look at your BDI configuration file and see what it is doing that you forgot to do in your initialization (often RAM initialization, sometimes port or other register initialization).  You should run a stripped down BDI config file (minimum hardware initialization) which should also point you to the problem area (at least you will be able to do some debugging on the "broken" initialization).

Wolfgang has a _lot_ of example BDI config files, check out the one(s) which match your processor
  ftp://ftp.denx.de/pub/BDI2000/

gvb


> -----Original Message-----
> From: u-boot-users-admin at lists.sourceforge.net
> [mailto:u-boot-users-admin at lists.sourceforge.net]On Behalf Of
> Knowledge
> Seeker
> Sent: Friday, July 23, 2004 2:48 PM
> To: Wolfgang Denk; talibalm at hotmail.com
> Cc: U-Boot List
> Subject: Re: [U-Boot-Users] Booting Board Without BDI
>
>
> At the moment, if bdi is not plugged in, board does not boot (see no
> activity on serial console).
>
> I will read reset section of MPC8xx User's Manual and thanks for the
> tip, will relocate flash.
>
> Abu Sana
>
> --- Wolfgang Denk <wd at denx.de> wrote:
> > In message <20040723015214.75503.qmail at web50509.mail.yahoo.com> you
> > wrote:
> > > I have 852T with fads board. In the current setup, after power on
> > > processor starts to execute from 0xff000100 and flash is located
> > at
> > > address 0x02000000 and first executable byte of u-boot is at
> > > 0x02000100.
> >
> > This is definitely not a good memory map, especially not in case
> > you
> > want to use it on Linux later.
> >
> > > Well, in order to start executing u-boot code from flash without
> > bdi
> > > attached, what needs to be done and where.
> >
> > Detach BDI?
> >
> > > I have some confusion in my mind. I know that higher order bits
> > will
> > > be ignored (by settings of br0 & or0 registers). Even in this case
> > > changes should be made in u-boot or someplace else. If this is
> > u-boot,
> >
> > What sort of changes should be made? Who says so?
> >
> > > than its kind of checken and egg problem. How will it know before
> > > reading u-boot settings for br0 & or0.
> >
> > Read the MPC8xx User's Manual section about how reset works.
> >
> > Best regards,
> >
> > Wolfgang Denk
> >
> > --
> > Software Engineering:  Embedded and Realtime Systems,  Embedded
> > Linux
> > Phone: (+49)-8142-4596-87  Fax: (+49)-8142-4596-88  Email:
> > wd at denx.de
> > The existence of god implies a violation of causality.
> >
> >
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