From mboxrd@z Thu Jan 1 00:00:00 1970 Date: Mon, 15 Feb 1999 13:41:04 +0100 To: linuxppc-dev@lists.linuxppc.org, Paul Mackerras From: Benjamin Herrenschmidt Subject: Problem with iMacs and kernel entry Message-Id: <19990215134104.006599@mail.mipsys.com> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Sender: owner-linuxppc-dev@lists.linuxppc.org List-Id: I've just thought about another problem: Since the new bootx will enter the kernel with MMU disabled, no-one is allowed to perform any kind of i/o until the MMU is re-enabled. At least that's my understanding, since cache and speculative pre-fetching are enabled for the whole address range, including devices. That means that the iMac "hack" in prom.c that disables the USB controller will get into trouble, won't it ? I want to avoid enabling the MMU in the bootstrap to avoid the problem of TLB misses on 603 (the boostrap has no exception handler) and I don't like the fact that the kernel entry plays with BATs with MMU enabled. Any comments ? -- E-Mail: BenH. Web : [[ This message was sent via the linuxppc-dev mailing list. Replies are ]] [[ not forced back to the list, so be sure to Cc linuxppc-dev if your ]] [[ reply is of general interest. To unsubscribe from linuxppc-dev, send ]] [[ the message 'unsubscribe' to linuxppc-dev-request@lists.linuxppc.org ]]