Hi, Scott

Scott Wood wrote:

Felix Radensky wrote:

quoted

Yes, NAND and NOR are on the same local bus controller.

Maybe powerpc folks can provide some insight here.
Is it possible that simultaneous access to NOR and NAND
on MPC8536 can result in NAND timeouts ?

I've heard other reports of such problems with eLBC, but was unable to 
reproduce it myself last time I tried.  Could you reduce this down to 
a minimal set of specific reproduction instructions (e.g. eliminate 
UBI if possible, or else explain how to set up UBI)?

-Scott

I use u-boot-2009.08 and linux-2.6.31 compiled with ELDK 4.2
UBI (under Device Drivers->MTD->UBI) and UBIFS
(under File Systems->Miscellaneous filesystems) should be enabled
in kernel configuration. I use the following configuration options 
(default ones):

CONFIG_MTD_UBI=y
CONFIG_MTD_UBI_WL_THRESHOLD=4096
CONFIG_MTD_UBI_BEB_RESERVE=1
# CONFIG_MTD_UBI_GLUEBI is not set
# UBI debugging options
# CONFIG_MTD_UBI_DEBUG is not set
# CONFIG_JFFS2_RUBIN is not set
CONFIG_UBIFS_FS=y
# CONFIG_UBIFS_FS_XATTR is not set
# CONFIG_UBIFS_FS_ADVANCED_COMPR is not set
CONFIG_UBIFS_FS_LZO=y
CONFIG_UBIFS_FS_ZLIB=y
# CONFIG_UBIFS_FS_DEBUG is not set

Root file system is mounted over NFS (also ELDK 4.2). udev is not used.
mtd-utils (which include ubi tools) are from latest 
git://git.infradead.org/mtd-utils.git

I've added the following eLBC node to mpc8536ds.dts

    localbus@ffe05000 {
        #address-cells = <2>;
        #size-cells = <1>;
        compatible = "fsl,mpc8536-elbc", "fsl,elbc", "simple-bus";
        reg = <0xffe05000 0x1000>;
        interrupts = <19 2>;
        interrupt-parent = <&mpic>;

        ranges = <0x0 0x0 0xe8000000 0x08000000
              0x1 0x0 0xe8000000 0x08000000
              0x2 0x0 0xffa00000 0x00040000
              0x3 0x0 0xffdf0000 0x00008000
              0x4 0x0 0xffa40000 0x00040000
              0x5 0x0 0xffa80000 0x00040000
              0x6 0x0 0xffac0000 0x00040000>;

        nor@0,0 {
            #address-cells = <1>;
            #size-cells = <1>;
            compatible = "cfi-flash";
            reg = <0x0 0x0 0x8000000>;
            bank-width = <2>;
            device-width = <1>;

            partition@0 {
                label = "ramdisk";
                reg = <0x0 0x03000000>;
                read-only;
            };

            partition@3000000 {
                label = "diagnostics";
                reg = <0x03000000 0x00e00000>;
                read-only;
            };

            partition@3e00000 {
                label = "dink";
                reg = <0x03e00000 0x00200000>;
                read-only;
            };

            partition@4000000 {
                label = "kernel";
                reg = <0x04000000 0x00400000>;
                read-only;
            };

            partition@4400000 {
                label = "jffs2";
                reg = <0x04400000 0x03b00000>;
            };

            partition@7f00000 {
                label = "dtb";
                reg = <0x07f00000 0x00080000>;
                read-only;
            };

            partition@7f80000 {
                label = "u-boot";
                reg = <0x07f80000 0x00080000>;
                read-only;
            };
        };

        nand@2,0 {
            compatible = "fsl,mpc8536-fcm-nand",
                     "fsl,elbc-fcm-nand";
            reg = <0x2 0x0 0x40000>;
        };

        nand@4,0 {
            compatible = "fsl,mpc8536-fcm-nand",
                     "fsl,elbc-fcm-nand";
            reg = <0x4 0x0 0x40000>;
        };

        nand@5,0 {
            compatible = "fsl,mpc8536-fcm-nand",
                     "fsl,elbc-fcm-nand";
            reg = <0x5 0x0 0x40000>;
        };

        nand@6,0 {
            compatible = "fsl,mpc8536-fcm-nand",
                     "fsl,elbc-fcm-nand";
            reg = <0x6 0x0 0x40000>;
        };

        board-control@3,0 {
            compatible = "fsl,mpc8536ds-fpga-pixis";
            reg = <0x3 0x0 0x8000>;
        };
    };

I use the script below to reproduce the problem. rfs.tar.bz2 is 350MiB.

nand_dev=mtd7
nand_num=7
nor_dev=mtd4

flash_eraseall /dev/$nand_dev || exit 1
ubiformat /dev/$nand_dev || exit 1
ubictrl_major=`cat /sys/class/misc/ubi_ctrl/dev | cut -d: -f1`
ubictrl_minor=`cat /sys/class/misc/ubi_ctrl/dev | cut -d: -f2`
rm -f /dev/ubi_ctrl
mknod /dev/ubi_ctrl c $ubictrl_major $ubictrl_minor
ubiattach /dev/ubi_ctrl -m $nand_num  || exit 1
ubi0_major=`cat /sys/class/ubi/ubi0/dev | cut -d: -f1`
ubi0_minor=`cat /sys/class/ubi/ubi0/dev | cut -d: -f2`
rm -f /dev/ubi0
mknod /dev/ubi0 c $ubi0_major $ubi0_minor
ubimkvol /dev/ubi0 -N rootfs -s 800MiB  || exit 1
mkdir /mnt/rfs
mount -t ubifs ubi0:rootfs /mnt/rfs  || exit 1
tar xf /root/rfs.tar.bz2 -C /mnt/rfs
flash_eraseall /dev/$nor_dev || exit 1

Felix.