Re: [ts-7000] TS-NVRAM2 ram drive

[Frank <>]

Hi Jason,

The key is the slram or phram kernel modules.  You didn't mention which board and kernel you're using, so you'll have to fit what I say here into your configuration.

The short version is:

    modprobe slram map=VRAM,0xec800000,+0x100000

Where the 2nd parm is the address of the NVRAM, and the third is the length.

I have the 2M RAM of the TS-DIO64 configured as a NV RAM disk on my TS-7800.  That configuration is using a 2.6 kernel, and at the time I had to compile the kernel modules from the source.

Here's a overly commented shell script I use to configure the RAM as a disk.  As I mentioned above, you'll have to pick and choose the pieces relative to your configuration, but hopefully this can get you started.

Good luck!

-Frank
Holland, PA

===========================================
# Setting up a permanent RAM disk
# TS-DIO64 on a TS-7800

export PATH=$PATH:/initrd/usr/bin

# Set ISA Bus
peekpoke 32 0xe8000030 0x55555555
peekpoke 32 0xe8000034 0x55555555
peekpoke 32 0xe8000038 0x55555555
peekpoke 32 0xe800003c 0x55555555

# Check for DIO-64 - Must be 0xA4
id=`peekpoke 8 0xee000100`

# Enable RAM @ 0xec800000
peekpoke 8 0xee000102 0x10

# NAND Driver must be loaded first
modprobe ts7800

# Load slram module
modprobe slram map=VRAM,0xec800000,+0x100000

# Check for module load
dmesg

# Output of dmesg should be something like this
# slram: devname=VRAM, devstart=0xec800000, devlength=0x100000
# slram: Registered device VRAM from 3874816KiB to 3875840KiB
# slram: Mapped from 0xc8a00000 to 0xc8b00000

# Check the new device name
cat /proc/mtd

# Output of the above command should be something like this
# dev:    size   erasesize  name
# mtd0: 20000000 00020000 "whole chip"
# mtd1: 00400000 00020000 "kernel"
# mtd2: 00400000 00020000 "initrd"
# mtd3: 1f7e0000 00020000 "rootfs"
# mtd4: 00100000 00004000 "VRAM"  <-- This is the new device

# Let udev make the new devices
# May need to check if udev is running first
# /etc/init.d/udev start

# Output should be something like this.
# Starting the hotplug events dispatcher: udevd.
# Synthesizing the initial hotplug events...done.
# Waiting for /dev to be fully populated...done.

# Make a mount point (bbr = Battery Backed RAM)
mp=/opt/bbr

if [ ! -d $mp ]
then
  mkdir $mp
fi

# Make the filesystem
# Do this only the first time!!!!!!!!!
# or if the -fs flag is passed on the command line
if [ $# -eq 2 ]
then
  if [ "$1" = "-fs" ]
  then
    echo "Making filesystem on /dev/mtdblock4..."
    mkfs /dev/mtdblock4 -t ext2
  fi
fi

# Mount the filesystem
mount /dev/mtdblock4 $mp -t ext2

==========================================

jason95014 wrote:

Hello,

Does anyone know if there is a driver written?
Or, is there a way to configure the kernel to use it as RAM drive?

Thanks in advance.

Jason

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