Re: JFFS2 FS not writeable
--- Scott Wood [EMAIL PROTECTED] wrote: You may want to try increasing the OR[SCY] field or other timing parameters associated with the NAND flash. So are you saying that when this happened in the past it was a timing issue? This change would need to happen in u-boot correct? Ron ___ Linuxppc-dev mailing list Linuxppc-dev@ozlabs.org https://ozlabs.org/mailman/listinfo/linuxppc-dev
Re: JFFS2 FS not writeable
So I found something that looks suspicious to me. This may not be a fsl_elbc_nand.c problem, but a more general problem. Shortly after mounting the root filesystem, which is a jffs2 on a large page NAND device (my board is based on the MPC8313) the kernel appears to read the device starting just past the point defined by the 0x1985 . . . markers in the jffs2 filesystem, through the end of the device as defined by the dtb. More specifically in my device, the file system is approximately 0x20 and resides at 0x40 with the end of the device being 0x200. As it does this it is then writing the oob data into these blocks (0x60 - 0x1fe). The value that it was writing into the first 4 bytes of the oob are 0xff198520. This was problematic as the 0x20 was being placed into the large page NAND device bad block location (0x0). Given that there is a 0xff at the msb of the oob data, could this possibly be a byte swapping issue? I don't see though how this could be a problem in the large page NAND but not the small page NAND. I verified this by writing 0x in to the first 4 bytes of the oob data to ensure that 0xff was written into the bad block location. In the function fsl_elbc_write_buf: (*(unsigned int *)buf) = 0x; I know that this isn't a fix, but I don't know where this problem comes from and also I don't know the exact flow of the NAND device processes. I would be more than happy to investigate further and provide a patch if someone could point me in the right direction. Let me know if I'm off base here, but I think this is where my problem is. Ron Madrid ___ Linuxppc-dev mailing list Linuxppc-dev@ozlabs.org https://ozlabs.org/mailman/listinfo/linuxppc-dev
Re: JFFS2 FS not writeable
I have tried the latest code and now, I'm able to write a limited amount. After which when I reboot, more than 100 contiguous blocks have been marked bad, through the end of the device (according to the dts). Is this something that has been seen before? My NAND device is a large page. Ron --- Scott Wood [EMAIL PROTECTED] wrote: Ron Madrid wrote: I'm trying to make new directories, create files, save changes to files, etc. and when I reboot my changes are not being saved. I'm sorry if this is vague, but I haven't run into this problem before in previous kernels. I'm using 2.6.25 and my configuration is very similar to mpc8313erdb_defconfig, with changes to include NAND support as my flash device is a NAND. Also, my dts is very similar to mpc8313erdb.dts as well. I don't know where to start looking for the problem as there is no error. Here is what is printed on boot. Try head-of-tree; there have been several fixes to the eLBC FCM NAND driver. -Scott ___ Linuxppc-dev mailing list Linuxppc-dev@ozlabs.org https://ozlabs.org/mailman/listinfo/linuxppc-dev
Re: JFFS2 FS not writeable
Ron Madrid wrote: I have tried the latest code and now, I'm able to write a limited amount. After which when I reboot, more than 100 contiguous blocks have been marked bad, through the end of the device (according to the dts). Is this something that has been seen before? Yes, but not with the latest code. My NAND device is a large page. I've only had small page devices to test on, so it's quite likely that there's a large page bug in the driver somewhere. If your erase block size is not 128K, try the latest set_addr patch in the mtd-2.6.22.1 branch of u-boot-nand-flash (I still need to send it out for Linux). -Scott ___ Linuxppc-dev mailing list Linuxppc-dev@ozlabs.org https://ozlabs.org/mailman/listinfo/linuxppc-dev
Re: JFFS2 FS not writeable
In which function should I start searching for this problem? What would cause a block to be marked bad? Ron --- Scott Wood [EMAIL PROTECTED] wrote: Ron Madrid wrote: I have tried the latest code and now, I'm able to write a limited amount. After which when I reboot, more than 100 contiguous blocks have been marked bad, through the end of the device (according to the dts). Is this something that has been seen before? Yes, but not with the latest code. My NAND device is a large page. I've only had small page devices to test on, so it's quite likely that there's a large page bug in the driver somewhere. If your erase block size is not 128K, try the latest set_addr patch in the mtd-2.6.22.1 branch of u-boot-nand-flash (I still need to send it out for Linux). -Scott ___ Linuxppc-dev mailing list Linuxppc-dev@ozlabs.org https://ozlabs.org/mailman/listinfo/linuxppc-dev
Re: JFFS2 FS not writeable
Ron Madrid wrote: In which function should I start searching for this problem? What would cause a block to be marked bad? No particular function; just something that causes things to not work. :-P You may want to try increasing the OR[SCY] field or other timing parameters associated with the NAND flash. -Scott ___ Linuxppc-dev mailing list Linuxppc-dev@ozlabs.org https://ozlabs.org/mailman/listinfo/linuxppc-dev
Re: JFFS2 FS not writeable
Ron Madrid wrote: I'm trying to make new directories, create files, save changes to files, etc. and when I reboot my changes are not being saved. I'm sorry if this is vague, but I haven't run into this problem before in previous kernels. I'm using 2.6.25 and my configuration is very similar to mpc8313erdb_defconfig, with changes to include NAND support as my flash device is a NAND. Also, my dts is very similar to mpc8313erdb.dts as well. I don't know where to start looking for the problem as there is no error. Here is what is printed on boot. Try head-of-tree; there have been several fixes to the eLBC FCM NAND driver. -Scott ___ Linuxppc-dev mailing list Linuxppc-dev@ozlabs.org https://ozlabs.org/mailman/listinfo/linuxppc-dev
Re: JFFS2 FS not writeable
On Thu, 22 May 2008 13:36:32 -0700 (PDT) Ron Madrid [EMAIL PROTECTED] wrote: I'm trying to make new directories, create files, save changes to files, etc. and when I reboot my changes are not being saved. I'm sorry if this is vague, but I haven't run into this problem before in previous kernels. I'm using 2.6.25 and my configuration is very similar to mpc8313erdb_defconfig, with changes to include NAND support as my flash device is a NAND. Also, my dts is very similar to mpc8313erdb.dts as well. I don't know where to start looking for the problem as there is no error. Here is what is printed on boot. Are you sure the mount is working? What does the output of mount say? Cheers, Sean ___ Linuxppc-dev mailing list Linuxppc-dev@ozlabs.org https://ozlabs.org/mailman/listinfo/linuxppc-dev
