Execute Reset via CheckStop approach

Wolfgang Denk wd at denx.de
Fri Aug 23 23:36:48 EST 2002


in message <3D66375C.2046CFA9 at ardistech.com> you wrote:
> I cleared CFG_DER in ppcboot to clear the CHSTP bit. After that I needed to
> map in the br0 range and to make the asm's volatile and set the input/output

Why do you think you have to do this? This is _NOT_ necessary.

> parameters of the asm to get the HRESET_N pulse. So this is the version
> which works (on a MPC823e) in the context of the Linux kernel:
>         /* Get base address mapped by BR0/OR0 and map it in */
>         val = ((immap_t *)IMAP_ADDR)->im_memctl.memc_br0 & 0xFFFF8000;
> 	val = (int) ioremap( retval, 0x4000 );

This code is wrong. You clobber the value of "val" here.

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
Defaults are wonderful, just like fire.
                  - Larry Wall in <1996Mar6.004121.27890 at netlabs.com>

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