[U-Boot-Users] HRCW on mpc8xx
wd at denx.de
Tue Mar 7 00:04:35 CET 2006
In message <af313df20603061432p5dd04d2fq38e1b76ae61cc8b3 at mail.gmail.com> you wrote:
> I have been looking on Readme, Dulg, list and could not find where is
> exactaly the hrcw for 8xx based systems.
Please read the MPC8xx User's Manual. The HRCW is a hardware issue.
It cannot be set and not even read (directly) by software.
> Looking at my image (either at the embedded system or the *bin file),
> I've found the magic number (0x27051956) in the begining of it. I
> thought it isn't the hrcw, so, I came around the /cpu/mpc8xx/start.S
No, that's indeed not the HRCW. Not even mine :-)
> So, if the magic number is in the cs0, address zero, it will be at the
> data bus at the reset moment, if CS0 is asserted (better: if the
> device is activated).
No, the HRCW is asserted by external hardware.
> I do not undestand. Is the magic number the HRCW?
No, it ain't. To most people it's just a magic number.
Software Engineering: Embedded and Realtime Systems, Embedded Linux
Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd at denx.de
Things that try to look like things often do look more like things
than things. Well-known fact. - Terry Pratchett, _Wyrd Sisters_
More information about the U-Boot