Hi, Nancy Isaac wrote: > Hi, > > This is a very long email with lots of questions. > > Summary of my system > I am working on bringing up a system that's running PPC 8313 with 32MB > of NOR flash, 512MB of NAND flash and 128MB of RAM. We have the NOR > flash to run u-boot and NAND flash has the kernel and file system. So NOR is practically empty? All bits, kernel and rootfs plus any additional partitions, are on NAND then? > For the NAND flash, we are using JFFS2 for file system type. I > initially set up just two partitions, boot and rootfs. Our root file > system is about 50MB. Big! > > Problem1 : It takes about 5 minutes for me to boot up the system. > Question: Does anyone have any suggestions to reduce this time? Maybe using NOR flash might speed things up.. Have you tried using JFFS2 summary? > > The common response I get is that I should use YAFFS2. I can't find a > way to program a yaffs2 image for both kernel and rootfs from uboot. > Uboot seems to think the file system type is JFFS2 and all commands > are designed with that in mind. I haven't used u-boot quite some time now, but I think all you need is support for rootfs YAFFS2 image - kernel is just infront of the rootfs, forming a combined flash 'image'. I'm not familiar with your architecture, and the way it boots so it might be a bit different. > > Is there a way to figure out how fragmented the NAND flash is? > What are some JFFS2 related statistics that I can use? > Is there a way to force a defragmentation of the NAND flash? For > example, before I put a new release on there, can force a defrag to > happen? When I update the partitions on my system I usually erase the NOR/NAND partition and then dd/nandwrite the update image anew. I know it is not always doable (updating rootfs that way might fail), but using tmpfs and temporary busybox even this can be overcome. HTH, Hinko -- ČETRTA POT, d.o.o., Kranj Planina 3 4000 Kranj Slovenia, Europe Tel. +386 (0) 4 280 66 03 E-mail: hinko.kocevar@xxxxxxxxxxxx Http: www.cetrtapot.si -- To unsubscribe from this list: send an email with "unsubscribe kernelnewbies" to ecartis@xxxxxxxxxxxx Please read the FAQ at http://kernelnewbies.org/FAQ
