TLB and CSSBAR problems with MPC8540 and BDI2000

Milliorn Gary-rxcr80 Gary.Milliorn at
Thu Jan 15 04:19:17 EST 2004

> From: owner-linuxppc-embedded at
> [mailto:owner-linuxppc-embedded at]On Behalf Of Dan
> Malek
> Yep.  I have one now.  Make sure your u-boot image also has a TLB1
> entry for your "default" CCSRBAR.  Further, make sure your BDI init
> section doesn't move the CCSRBAR from the default value assumed by
> your u-boot image.  I had the latter correct, just didn't realize
> that a "TLB1 flash invalidate" command to the MMUCSR0 doesn't seem
> to honor the 'invalidate protect' in the TLB entry.  Everything
> works fine when you get all of the ducks in a row :-)

  The TLB1 issue is due to the MPC85x0 errata "CPU4"; there's a s/w
workaround.  It's nice if BDI fixes it for you, but seems like it would
not be necessary.

Gary Milliorn

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