[U-Boot-Users] HRCW on mpc8xx
I have been looking on Readme, Dulg, list and could not find where is exactaly the hrcw for 8xx based systems.
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 to take some look and found it at the initial statements (as expected).
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).
I do not undestand. Is the magic number the HRCW?
In message af313df20603061432p5dd04d2fq38e1b76ae61cc8b3@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.
Best regards,
Wolfgang Denk
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Addison Baldwin -
Wolfgang Denk