mpc860 vs. mpc860T

Steven Vacca svacca at
Tue Jan 15 06:02:42 EST 2002

I have 2 bds., the BD #1 is custom designed and based very
closely on the design of the BD #2.  The main difference
is BD #1 uses an mpc860T and BD #2 uses an mpc860.

Both have 32 Meg DRAM, 50MHz.

I can use the exact same Flash Boot code on each,
and download the exact same Linux kernel and app to each.

BD #2 (mpc860) works perfectly, all the way thru to the app
executing threads, etc.

BD #1 (mpc860T) works up until at various points between when
the kernel initializes itself, and the app execution begins, it gets
exception errors, usually something similar to the following:

  Kernel panic: kernel access of bad area pc c0023634 lr c00235ec
                      address 813F004C tsk kswapd/5

  Kernel panic: ramdisk: request list destroyed

Does anyone know of any differences between the 2 CPU's, other than
the mpc860T's internal FEC section and the MII interface on port D, that
might cause such problems?



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