Creating a ramdisk

SteveG10854

I’d like to set up a ramdisk to use for a fast file storage/retrieval filesystem. I have this in my bootargs:

ramdisk_size=16000

During bootup I see this:

RAMDISK driver initialized: 1 RAM disks of 16000K size 1024 blocksize

At the moment there are no /dev/ramx devices showing up in the /dev directory. Doing a bit of Googling it looks like I now have to create a file system, maybe something like this, but it gives me a “Could not stat” error:

# mkfs.ext2 /dev/ram0
mke2fs 1.35 (28-Feb-2004)
Could not stat /dev/ram0 --- No such file or directory. The device apparently does not exist; did you specify it correctly?
#

Could you advise me please on the configuration and steps to create a general purpose ramdisk on the EVM? Many thanks.

over 16 years ago

0 Juan Gonzales over 16 years ago

TI__Mastermind 37340 points

Have you seen this wiki article on our DaVinci wiki site: http://wiki.davincidsp.com/index.php/Creating_a_RAMDISK

There are a few related articles which may be helpful as well: http://wiki.davincidsp.com/index.php/Special:Search?search=ramdisk

0 ruqun xu over 16 years ago in reply to Juan Gonzales

Intellectual 990 points

I see the wiki articles you recommended.

And I wrote "ramdisk.sh " to make ramdisk.

But I found the ramdisk size was limited (<26M),otherwise the kernel will display " RAMDISK: Compressed image found at block 0".

I used DM365,mv 5.0,

My "ramdisk.sh"

cd /home/xrqun/ramdisk_make2/tmp
dd if=/dev/zero of=ramdisk bs=1M count=25
/sbin/mkfs.ext2 ramdisk
mount ramdisk /home/xrqun/ramdisk_make2/mnt -o loop
cd /home/xrqun/ramdisk_make2/mnt
cp -a /home/xrqun/workdir/filesys_flash/* .
cd /home/xrqun/ramdisk_make2/tmp
umount /home/xrqun/ramdisk_make2/mnt
gzip ramdisk
cp -a ramdisk.gz /tftpboot/ramdisk365.gz

My filesys is less than 23M.

uboot bootargs is :

setenv bootargs console=ttyS0,115200n8 ip=dhcp root=/dev/ram0 rw initrd=0x82000000,11M mem=60M

If I change the "ramdisk.sh" COUNT =28 or 32,the kernel will display " RAMDISK: Compressed image found at block 0".

I don`t no why.

And if my filesys is 32M,what can I do to make and use ramdisk?

0 ruqun xu over 16 years ago in reply to ruqun xu

Intellectual 990 points

Is there anyone find the question?

Processors

Processors forum

Creating a ramdisk