Why is my cramfs root filesystem mount (/dev/mtdblock0) failing on the Versatile Express platform when running v2.6.35 and later Linux kernels? Applies to:, Answer Several ways exist to mount a root filesystem on an ARM platform running Linux. This article only applies to the case where the filesystem image is in flash and is accessed using the Linux MTD driver with 'mtdblock' as the FTL (flash translation layer). MTD flash partitions are typically specified as part of the kernel boot arguments in the bootloader. Below is an example of how this is done when using U-Boot: bootargs= root=/dev/mtdblock0 mtdparts= armflash.0:60000k@0x50000(cramfs). The root filesystem is mounted to block device '/dev/mtdblock0'.

The block device contains one or more partitions as specified with the 'mtdparts' option. Note that each partition specifies a flash device ('armflash.0'), a partition size (60000k), the relative address from the flash device base address (0x50000) and an arbitrary name ('cramfs'). The name of the flash device in the Linux kernel source for the Versatile Express has changed from ' armflash.0' to only ' armflash'.

The U-Boot kernel boot arguments must be changed to reflect the new name as shown below: bootargs= root=/dev/mtdblock0 mtdparts= armflash:60000k@0x50000(cramfs). This change affects Linux kernel versions based on v2. Our parliament by subhash kashyap pdf. 6.35 and later with the ARM patch applied (2.6.35-arm1).

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Cramfs in nand flash with bad block. So, do anyone have the idea about how to fixed the nand bad block with cramfs? Or having some PSP patchs on this?

The change only affects the Versatile Express platform. All previous ARM developments boards running this version of the kernel are unaffected.

Please visit the for the latest release of prebuilt kernel and filesystem images, as well as the ARM Linux kernel patch. Article last edited on: 2011-02-21 10:44:02.

Dear all, In my application, I used cramfs for my filesystem in the nandflash. While booting from the nand and starting the kernel, found the error logs below: VFS: Mounted root (cramfs filesystem) readonly on device 31:4. Devtmpfs: mounted Freeing init memory: 196K cramfs: bad compressed blocksize cramfs: bad compressed blocksize cramfs: bad compressed blocksize cramfs: bad compressed blocksize /bin/sh: error while loading shared libraries: libm.so.6: cannot open shared object file: Input/output error Kernel panic - not syncing: Attempted to kill init! There are two options to solve your problem: First of all you have to know that cramfs can NOT handle Bad Blocks, so your cramfs image has to be a monolithe. You can achieve this in two ways: First one is to copy your cramfs image to a Ramdrive using uBoot. UBoot will skip bad Blocks and your Image will be a single Block in the Ramdrive. Second option is to make sure that you copy your cramfs image to a memory space where it is not broken by bad Blocks.