Thread (2 messages) 2 messages, 2 authors, 2004-02-27

RE: problem with standard libc on 8xx

From: Joakim Tjernlund <hidden>
Date: 2004-02-27 10:18:33

Possibly related (same subject, not in this thread)

In message
<9CFB9DA5261CD611A29B00508B78904807F880ED@ex-deu-munich02.forc
e.de> you wrote:
quoted
I created my own root-fs for a MPC8xx platform
using standard Debian packages (including libc).
When I start the system, the init scripts hangs
...
quoted
I guess that the Debian libc uses floating point - which
Thi sis definitely one cause of the problem.  Another  one  might  be
optimization  for  a  incorrect  cache  line  size  (32 instead of 16
bytes).
Also, you must make sure you don't use any cache instructions such
as dcbz. I believe the optimized memset function i glibc uses dcbz.

The mpc8xx CPU has a HW bug which makes the TLB exceptions fail
for most cache instructions. There is a workaround for this, but it
is somewhat ugly. Search the embedded archives if you want to known more.

   Jocke

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