Dear Andreas,
in message 1058581655.1560.31.camel@localhost you wrote:
This patch does reset on 8xx like the linux kernel does it. Works without crashing u-boot unlike the previous version. Tested on mpc823.
There is no problem with U-Boots implementation of the "reset" command when you configure your board correctly. Therefore I see no need to "fix" anything. I reject this patch.
- dummy = immap->im_clkrst.res[0];
I know that the Linux kernel uses this implementation, but it is IMHO a very bad idea to rely on the behaviour when writing to a reserved area in the dual ported RAM. The next version of 8xx processors might use this area for something.
If you feel the current implementation needs improvment, please feel free to implement what we use for the 8260 in our Linux kernel source tree:
- Get base address mapped by BR0/OR0 - Enable CheckStop Reset - Invalidate BR0 mapping - Set MSR and cause reset by attemting to access the base address formerly mapped by BR0/OR0
Best regards,
Wolfgang Denk