Greetings! I would like to know as to how we can make a partition for a RAM memory on a PCI card and use it as a filesystem. System for development is x86 with 2.4.22 kernel. I, initially wrote a ramdisk driver to read/write data between buffer and RAM. Here, I have used: device->data = vmalloc (device->size); where: - device is the device driver structure variable - data = unsigned char * - size = unsigned int I am able to load the above block driver and mount a filesystem using: dd if=/dev/zero of=/dev/sbull bs=1k count=64 mkdir /mnt/mysbull mke2fs -vm0 /dev/sbull 64 mount /dev/sbull /mnt/mysbull For the PCI device driver, I have modifed the above to directly ioremap device->data as follows: device->data = ioremap_nocache (BASE_ADDRESS, BASE_SIZE); Have successfully done: dd if=/dev/zero of=/dev/sbull bs=1k count=64 (I have a driver-with-application that I earlier used to write some junk values; After executing the above statement the RAM contents are successfully written as zeroes. So, the block driver works for PCI) mkdir /mnt/mysbull mke2fs -vm0 /dev/sbull 64 But, when I proceed to make a partition, it fails. mount /dev/sbull /mnt/mysbull mount:error while guessing filesystem type mount: you must specify the filesystem type Even if I specify "-t ext2" for mount, it fails. I even tried a loopback device mount, but it fails too: mount -o loop /dev/sbull /mnt/mysbull FAT: bogus logical sector size 0 VFS: Can't find a valid FAT filesystem on dev FA:00 How can I map the RAM memory on the PCI card, even though I don't allocate any memory and display that to the end user as a filesystem partition so that he/she can read/write files to it? Thanks, K Shakthi -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/
