[U-Boot-Users] Booting Board Without BDI

Wolfgang Denk wd at denx.de
Fri Jul 23 09:47:48 CEST 2004

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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