[U-Boot-Users] Reset command causes Bus Fault on MPC823

Miller, John jmiller at incon.com
Wed Aug 4 16:35:39 CEST 2004

Hi Folks

Been working on getting u-boot's reset command to work correctly on my
RPXlite.  Kept on getting bus failures around line 181 of
cpu/mpc8xx/cpu_init.c (version 1.1.1).   I finally tried commenting out
the following lines (figuring that I wasn't an 850 and wasn't rev A
silicon) and am now able to perform a reset successfully at u-boot's
command prompt.

   * The following causes the RPXlite 823 with rev b2(?) silicon
   * to generate a bus fault when executing u-boot reset command.

  /* perform BR0 reset that MPC850 Rev. A can't guarantee *
  reg = memctl->memc_br0;
  reg &= BR_PS_MSK;	/* Clear everything except Port Size bits *
  reg |= BR_V;		/* then add just the "Bank Valid" bit     *
  memctl->memc_br0 = reg;

John Miller

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