From mboxrd@z Thu Jan 1 00:00:00 1970 Message-ID: <37BD73BB.3272A3BC@switchboard.ericsson.se> Date: Fri, 20 Aug 1999 17:26:51 +0200 From: Magnus Damm MIME-Version: 1.0 To: Pierre_Juste@email.mot.com CC: linuxppc-dev@lists.linuxppc.org Subject: Re: PPC Linux crash resulting MMU problem !! References: <37BD4FF7.D77C6019@email.sps.mot.com> Content-Type: text/plain; charset=us-ascii Sender: owner-linuxppc-dev@lists.linuxppc.org List-Id: Hi there! I've experienced some strange things with my 860 and linux. I've got a few different board around; MBX, ADS, FADS and some custom ones. The MBX has got some kind of boot software that loads the kernel. I've written boot code to the rest of the boards. The strange thing that happened was that my kernel died on all boards except for the MBX. I got a hint from a guy called Helmut Buchsbaum . He had a FADS with a 823 and he told me that he had to reserve a few TLB entries to make it work. Some other guy said that he had been using a bdm and seen the interrupt code trashed. Helmut gave him the patch and he said it worked much better with it. And my kernel works better with it. I think I get some kind of bad opcode in the bad opcode routine with out the patch and everything stops. That is maybe not your problem, but you might want to add this code to head.S and see if anything works better... Keep the list informed if you find out anything. Thanks / Magnus Damm the code: #ifdef CONFIG_FADS_FORCE_IO fadsForceIO: #ifdef CONFIG_MPC823 mfspr r8,MD_CTR ori r8,r8,0x0700 /* set TBL idx to 7 */ #endif #if defined(CONFIG_MPC860) || defined (CONFIG_MPC860T) mfspr r8,MD_CTR ori r8,r8,0x1F00 /* set TBL idx to 31 */ #endif mtspr MD_CTR, r8 lis r8, BOOT_IMMR@h /* Create vaddr for TLB */ ori r8, r8, MD_EVALID /* Mark it valid */ mtspr MD_EPN, r8 li r8, MD_PS8MEG /* Set 8M byte page */ ori r8, r8, MD_SVALID /* Make it valid */ mtspr MD_TWC, r8 lis r8, BOOT_IMMR@h /* Create paddr for TLB */ ori r8, r8, MI_BOOTINIT|0x2 /* Inhibit cache -- Cort */ mtspr MD_RPN, r8 mfspr r8,MD_CTR oris r8,r8,0x0800 /* set RSV2D */ mtspr MD_CTR, r8 blr #endif /* CONFIG_FADS_FORCE_IO */ [[ 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. Please check http://lists.linuxppc.org/ ]] [[ and http://www.linuxppc.org/ for useful information before posting. ]]