Re: How can I make flash writeable?
From: Duy-Ky Nguyen <hidden>
Date: 2008-10-18 01:19:46
Hi Mark, I guess you want to have RW filesystem for your Linux target. If that's the case you need to have root filesystem as JFFS2. There's a document MPC8313E-RDB BSP User's Guide comes with the MPC8313E-RDB package. It has all info for several filesystems like NFS (network), Ramdisk (Read-Only), and JFFS2 (Read/Write) Regards, Duy-Ky ----- Original Message ----- From: <redacted> To: <redacted> Sent: Friday, October 17, 2008 6:00 PM Subject: Linuxppc-embedded Digest, Vol 50, Issue 30
Send Linuxppc-embedded mailing list submissions to linuxppc-embedded@ozlabs.org To subscribe or unsubscribe via the World Wide Web, visit https://ozlabs.org/mailman/listinfo/linuxppc-embedded or, via email, send a message with subject or body 'help' to linuxppc-embedded-request@ozlabs.org You can reach the person managing the list at linuxppc-embedded-owner@ozlabs.org When replying, please edit your Subject line so it is more specific than "Re: Contents of Linuxppc-embedded digest..." Today's Topics: 1. Re: How can I make flash writeable? (Mark Bishop) 2. Re: How can I make flash writeable? (Marco Stornelli) 3. Re: Loadable module crashes at kernel stack overflow or machine check (Ben Gardiner) 4. Re: Oops in during system run (Scott Wood) ---------------------------------------------------------------------- Message: 1 Date: Fri, 17 Oct 2008 08:33:52 -0400 From: Mark Bishop <redacted> Subject: Re: How can I make flash writeable? To: linuxppc-embedded@ozlabs.org Message-ID: [off-list ref] Content-Type: text/plain; charset=ISO-8859-1; DelSp="Yes"; format="flowed" Ok, so bear with me. I've read booting-without-of.txt in the Documentation/powerpc directory and I modified a .dts file but now what? I use ltib or u-boot to load that into the device or do I roll a kernel with that file and flash the device with it? Apologies for the less than technical questions. Quoting Marco Stornelli [off-list ref]:quoted
Hi Mark,quoted
How can I tell which devices are mapped to /proc/mtd devices?If I well understand the question, you'd like to change the partitions layout (?), so you should check out the dts file to see the flash layout, then you can specify there the partitions and change the dimensions, if they are read-only...and so on. Regards, Mark Bishop ha scritto:quoted
I am using the MPC8313E-RDB and I am having some problems using the flash that comes on the board. Let me preface this by saying that I haven't worked in the embedded linux arena in about 10 years so I am trying to catch up with all the new toys. This board uses uBoot and it currently has 128M of DDR2, 8M flash and 32M NAND Flash. I have a few questions: How can I tell which memory device it uses to boot out of? How can I tell which devices are mapped to /proc/mtd devices? I want to create a writeable flash partition, is there a FAQ out there I could look at. All of this is after a few days of using Google to try and glean some data from the internet. And the books don't get here from Amazon until Monday. I would appreciate any help. Even a RTFM - if you could point me to TFM, it would greatly help. _______________________________________________ Linuxppc-embedded mailing list Linuxppc-embedded@ozlabs.org https://ozlabs.org/mailman/listinfo/linuxppc-embedded-- Marco Stornelli Embedded Software Engineer CoRiTeL - Consorzio di Ricerca sulle Telecomunicazioni http://www.coritel.it marco.stornelli@coritel.it +39 06 72582838------------------------------ Message: 2 Date: Fri, 17 Oct 2008 15:13:58 +0200 From: Marco Stornelli <redacted> Subject: Re: How can I make flash writeable? To: Mark Bishop <redacted> Cc: linuxppc-embedded@ozlabs.org Message-ID: [off-list ref] Content-Type: text/plain; charset=us-ascii You have to compile it with the dtc compiler and load it with the uboot bootm command, indeed, (at least with a recent uboot version) it has three parameters: kernel, dtb (the name of dts compiled) and initrd. If you want you can store the dtb in flash. Regards, Mark Bishop ha scritto:quoted
Ok, so bear with me. I've read booting-without-of.txt in the Documentation/powerpc directory and I modified a .dts file but now what? I use ltib or u-boot to load that into the device or do I roll a kernel with that file and flash the device with it? Apologies for the less than technical questions. Quoting Marco Stornelli [off-list ref]:quoted
Hi Mark,quoted
How can I tell which devices are mapped to /proc/mtd devices?If I well understand the question, you'd like to change the partitions layout (?), so you should check out the dts file to see the flash layout, then you can specify there the partitions and change the dimensions, if they are read-only...and so on. Regards, Mark Bishop ha scritto:quoted
I am using the MPC8313E-RDB and I am having some problems using the flash that comes on the board. Let me preface this by saying that I haven't worked in the embedded linux arena in about 10 years so I am trying to catch up with all the new toys. This board uses uBoot and it currently has 128M of DDR2, 8M flash and 32M NAND Flash. I have a few questions: How can I tell which memory device it uses to boot out of? How can I tell which devices are mapped to /proc/mtd devices? I want to create a writeable flash partition, is there a FAQ out there I could look at. All of this is after a few days of using Google to try and glean some data from the internet. And the books don't get here from Amazon until Monday. I would appreciate any help. Even a RTFM - if you could point me to TFM, it would greatly help. _______________________________________________ Linuxppc-embedded mailing list Linuxppc-embedded@ozlabs.org https://ozlabs.org/mailman/listinfo/linuxppc-embedded-- Marco Stornelli Embedded Software Engineer CoRiTeL - Consorzio di Ricerca sulle Telecomunicazioni http://www.coritel.it marco.stornelli@coritel.it +39 06 72582838_______________________________________________ Linuxppc-embedded mailing list Linuxppc-embedded@ozlabs.org https://ozlabs.org/mailman/listinfo/linuxppc-embedded-- Marco Stornelli Embedded Software Engineer CoRiTeL - Consorzio di Ricerca sulle Telecomunicazioni http://www.coritel.it marco.stornelli@coritel.it +39 06 72582838 ------------------------------ Message: 3 Date: Fri, 17 Oct 2008 09:12:07 -0400 From: Ben Gardiner <redacted> Subject: Re: Loadable module crashes at kernel stack overflow or machine check To: Ganesh Kumar N M <redacted> Cc: linuxppc-dev@ozlabs.org, linuxppc-embedded@ozlabs.org Message-ID: [off-list ref] Content-Type: text/plain; charset="iso-8859-1"; Format="flowed" Ganesh Kumar N M wrote:quoted
*Hi All,* ** * I'm working on MPC860 with Montavista linux 2.4.18* *We have a Linux kernel loadable module which on loading* *panicks after some random time say 8 hours, 4 hours or so* *the oops outputs say either machine check exception or * *kernel stack overflow (randomly both show up) a**re as below:*I don't know for sure what could be causing your problem. I can only suggest some patches that have helped us in the past. I'm not familiar with Montavista's kernel versions; but I know our 2.4.24 kernel did not have the 'separate I-TLB error and miss handling' patch ( http://ozlabs.org/pipermail/linuxppc-embedded/2005-January/016382.html ) which caused our applications to segfault for not apparent reason. I also suggest applying the CPU15 fix ( http://git.denx.de/?p=linuxppc_2_4_devel.git;a=commit;h=baf9a6caca75b1f338ae370669e5882809000164 and http://git.denx.de/?p=linuxppc_2_4_devel.git;a=commit;h=3ad403717f1d9c6a09ec41a5b016ac5245591122 ) and enabling it temporarily to see if the problem could be the unlucky placement of a branch instruction at the end of a page; but evaluate the performance of your application carefully if you are considering running production code with the patch enabled as it introduces significant overhead. Regards, Ben Gardiner Nanometrics Seismological Instruments 250 Herzberg Rd., Kanata, ON, CA, K2K 2A1 -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://ozlabs.org/pipermail/linuxppc-embedded/attachments/20081017/ba2e605f/attachment.html> ------------------------------ Message: 4 Date: Fri, 17 Oct 2008 10:21:32 -0500 From: Scott Wood <redacted> Subject: Re: Oops in during system run To: Sreejith <redacted> Cc: linuxppc-dev@ozlabs.org, linuxppc-embedded@ozlabs.org Message-ID: [off-list ref] Content-Type: text/plain; charset=us-ascii On Fri, Oct 17, 2008 at 03:49:12PM +0530, Sreejith wrote:quoted
This is a peculiar Oops we are encountering during the running of our board (sh4) architectureSo why are you posting to powerpc lists?quoted
PC : 844240f8 SP : 88d1ff44 SR : 400080f0 TEA : c0169d64 Tainted: PWith proprietary modules, too.quoted
Give you valuable suggestions!!Debug the code? Switch to powerpc? :-) -Scott ------------------------------ _______________________________________________ Linuxppc-embedded mailing list Linuxppc-embedded@ozlabs.org https://ozlabs.org/mailman/listinfo/linuxppc-embedded End of Linuxppc-embedded Digest, Vol 50, Issue 30 *************************************************