From mboxrd@z Thu Jan 1 00:00:00 1970 Message-ID: <034c01c40775$1dbb9fe0$3000a8c0@foundation> From: "Stuart Yoder" To: "LinuxPPC" Subject: problem during kernel init with mmu_off Date: Thu, 11 Mar 2004 08:28:25 -0600 MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Sender: owner-linuxppc-embedded@lists.linuxppc.org List-Id: I am trying to boot the 2.4 PPC kernel on a PPC750FX eval board. The bootloader in the boards firmware has the mmu _on_ with block addr translation enabled. It seems that all the BAT mappings are 1:1. The kernel source as well as comments in the archive of this mailing list indicate that the mmu being on during kernel initialization should not be an issue. However, I've determined through leds and uart that the kernel makes it to the RFI in mmu_off, but from that point goes into never-never land (I can't tell exactly what happened). I've verified that the values in SRR0 and SRR1 are what is expected prior to the RFI which is supposed to turn the mmu off. I also tried using MTMSR instead of RFI to turn the mmu off but the processor seems to halt at that instruction. I don't have a jtag debugger (yet) so I'm relying on leds and uart to debug. I really have no idea of the state of the chip after the RFI or MTMSR. Anyone out there have any ideas? Anything about the 750FX that is different than other processors? Thanks, Stuart Yoder ** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/