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Re: TLB on R10k

To: sskowron@ET.PUT.Poznan.PL
Subject: Re: TLB on R10k
From: Alex Deucher <>
Date: Wed, 28 Apr 2004 08:05:20 -0700 (PDT)
Original-recipient: rfc822;
This thread may be ARM specific, but it sounds like a similar problem. 
if it's of no use, please ignore.



> Have you verified that the UX bit is set correctly by your kernel? 
> also plays a role but since you survive BogoMIPS it should be right.

From what I remember, the UX bit is fixed set. I have made the machine
print a '*' (no, I didn't use printk, but since it's my own console
driver I'm pretty sure it can work in interrupts - all it does is
hardware writes) whenever it gets a TLB refill and flushed the TLB
entering usermode. Guess what, I didn't get a single '*' after ERET. To
verify my method, I've made a single read from the usermode PC from the
kernel, and the '*' appeared. I don't know what's up.


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