Hi,

I have been trying to configure my eval board to boot up using the ramdisk through an initrd.

I have included the initrd and ramdisk support in the kernel configuration.

Under-attached is my .config file for your reference.

. . . .

# # RAM/ROM/Flash chip drivers # CONFIG_MTD_CFI=y # CONFIG_MTD_JEDECPROBE is not set CONFIG_MTD_GEN_PROBE=y # CONFIG_MTD_CFI_ADV_OPTIONS is not set CONFIG_MTD_MAP_BANK_WIDTH_1=y CONFIG_MTD_MAP_BANK_WIDTH_2=y CONFIG_MTD_MAP_BANK_WIDTH_4=y # CONFIG_MTD_MAP_BANK_WIDTH_8 is not set # CONFIG_MTD_MAP_BANK_WIDTH_16 is not set # CONFIG_MTD_MAP_BANK_WIDTH_32 is not set CONFIG_MTD_CFI_I1=y CONFIG_MTD_CFI_I2=y # CONFIG_MTD_CFI_I4 is not set # CONFIG_MTD_CFI_I8 is not set # CONFIG_MTD_CFI_INTELEXT is not set CONFIG_MTD_CFI_AMDSTD=y CONFIG_MTD_CFI_AMDSTD_RETRY=0 # CONFIG_MTD_CFI_STAA is not set CONFIG_MTD_CFI_UTIL=y # CONFIG_MTD_RAM is not set # CONFIG_MTD_ROM is not set # CONFIG_MTD_ABSENT is not set

. . .

# # NAND Flash Device Drivers # # CONFIG_MTD_NAND is not set

# # Plug and Play support #

# # Block devices # # CONFIG_BLK_DEV_FD is not set # CONFIG_BLK_DEV_COW_COMMON is not set CONFIG_BLK_DEV_LOOP=y # CONFIG_BLK_DEV_CRYPTOLOOP is not set CONFIG_BLK_DEV_NBD=y # CONFIG_BLK_DEV_UB is not set CONFIG_BLK_DEV_RAM=y CONFIG_BLK_DEV_RAM_COUNT=16 CONFIG_BLK_DEV_RAM_SIZE=4096 CONFIG_BLK_DEV_INITRD=y CONFIG_INITRAMFS_SOURCE="" # CONFIG_CDROM_PKTCDVD is not set

. . . . . .

# # File systems # CONFIG_EXT2_FS=y # CONFIG_EXT2_FS_XATTR is not set # CONFIG_EXT3_FS is not set # CONFIG_JBD is not set # CONFIG_REISERFS_FS is not set # CONFIG_JFS_FS is not set

# # XFS support # # CONFIG_XFS_FS is not set # CONFIG_MINIX_FS is not set CONFIG_ROMFS_FS=y # CONFIG_QUOTA is not set CONFIG_DNOTIFY=y # CONFIG_AUTOFS_FS is not set CONFIG_AUTOFS4_FS=y

# # CD-ROM/DVD Filesystems # # CONFIG_ISO9660_FS is not set # CONFIG_UDF_FS is not set

# # DOS/FAT/NT Filesystems # CONFIG_FAT_FS=y # CONFIG_MSDOS_FS is not set CONFIG_VFAT_FS=y CONFIG_FAT_DEFAULT_CODEPAGE=437 CONFIG_FAT_DEFAULT_IOCHARSET="iso8859-1" # CONFIG_NTFS_FS is not set

# # Pseudo filesystems # CONFIG_PROC_FS=y CONFIG_SYSFS=y CONFIG_DEVFS_FS=y # CONFIG_DEVFS_MOUNT is not set # CONFIG_DEVFS_DEBUG is not set # CONFIG_DEVPTS_FS_XATTR is not set # CONFIG_TMPFS is not set # CONFIG_HUGETLB_PAGE is not set CONFIG_RAMFS=y

# # Miscellaneous filesystems # # CONFIG_ADFS_FS is not set # CONFIG_AFFS_FS is not set # CONFIG_HFS_FS is not set # CONFIG_HFSPLUS_FS is not set # CONFIG_BEFS_FS is not set # CONFIG_BFS_FS is not set # CONFIG_EFS_FS is not set # CONFIG_JFFS_FS is not set CONFIG_JFFS2_FS=y CONFIG_JFFS2_FS_DEBUG=0 # CONFIG_JFFS2_FS_NAND is not set # CONFIG_JFFS2_FS_NOR_ECC is not set # CONFIG_JFFS2_COMPRESSION_OPTIONS is not set CONFIG_JFFS2_ZLIB=y CONFIG_JFFS2_RTIME=y # CONFIG_JFFS2_RUBIN is not set CONFIG_CRAMFS=y # CONFIG_VXFS_FS is not set # CONFIG_HPFS_FS is not set # CONFIG_QNX4FS_FS is not set # CONFIG_SYSV_FS is not set # CONFIG_UFS_FS is not set

# # Network File Systems # CONFIG_NFS_FS=y CONFIG_NFS_V3=y # CONFIG_NFS_V4 is not set # CONFIG_NFS_DIRECTIO is not set # CONFIG_NFSD is not set CONFIG_ROOT_NFS=y CONFIG_LOCKD=y CONFIG_LOCKD_V4=y CONFIG_SUNRPC=y # CONFIG_RPCSEC_GSS_KRB5 is not set # CONFIG_RPCSEC_GSS_SPKM3 is not set # CONFIG_SMB_FS is not set # CONFIG_CIFS is not set # CONFIG_NCP_FS is not set # CONFIG_CODA_FS is not set # CONFIG_AFS_FS is not set . . . . . .

However, during bootup it seems that the kernel is unable to locate the correct magic number for the ext2fs format initrd and refuses to bootup. The printk statements which I included shows that the kernel seems to extract the magic number from the wrong location in the function, identify_ramdisk_image of do_mounts_rd.c which is suppose to be 'ef53' for the case of an ext2fs image. The bootargs which i used are :

bootargs=console=ttyS1 root=/dev/ram0

The under-attached are the messages from the console upon bootup.

U-Boot# bootm 10000 300000 ## Booting image at 00010000 ... Image Name: Linux-2.6.11-Cooper Image Type: ARM Linux Kernel Image (uncompressed) Data Size: 1189964 Bytes = 1.1 MB Load Address: 00008000 Entry Point: 00008000 Verifying Checksum ... OK OK ## Loading Ramdisk Image at 00300000 ... Image Name: Ext2fs Ramdisk Image Image Type: ARM Linux RAMDisk Image (gzip compressed) Data Size: 415164 Bytes = 405.4 kB Load Address: 00000000 Entry Point: 00000000 Verifying Checksum ... OK ## Transferring control to Linux (at address 00008000) ...

Starting kernel ...

Uncompressing Linux.............................................................................. done, bootin g the kernel. Linux version 2.6.11-Cooper (root@debianworld) (gcc version 3.4.4 20050314 (prerelease) (Debian 3.4.3-13)) #8 Mon Jul 25 15:31:15 SGT 2005 CPU: ARM926EJ-Sid(wb) [41069264] revision 4 (ARMv5TEJ) CPU0: D VIVT write-back cache CPU0: I cache: 8192 bytes, associativity 4, 32 byte lines, 64 sets CPU0: D cache: 4096 bytes, associativity 4, 32 byte lines, 32 sets Machine: NS9360 Memory policy: ECC disabled, Data cache writeback NS9360 Rev. 0, running at 176 MHz Built 1 zonelists Kernel command line: console=ttyS1 root=/dev/ram0 PID hash table entries: 128 (order: 7, 2048 bytes) Console: colour dummy device 80x30 Dentry cache hash table entries: 4096 (order: 2, 16384 bytes) Inode-cache hash table entries: 2048 (order: 1, 8192 bytes) Memory: 16MB = 16MB total Memory: 13240KB available (2001K code, 415K data, 100K init) Mount-cache hash table entries: 512 (order: 0, 4096 bytes) CPU: Testing write buffer coherency: ok checking if image is initramfs...it isn't (bad gzip magic numbers); looks like an initrd Freeing initrd memory: 405K NET: Registered protocol family 16 SCSI subsystem initialized usbcore: registered new driver usbfs usbcore: registered new driver hub i2c_ns: I2C ns9750 driver $Revision: 1.1 $ initializing NetWinder Floating Point Emulator V0.97 (double precision) devfs: 2004-01-31 Richard Gooch (rgooch@atnf.csiro.au) devfs: boot_options: 0x0 JFFS2 version 2.2. (C) 2001-2003 Red Hat, Inc. ns9360fb: Using LCD display STN LCD Console: switching to colour frame buffer device 40x30 fb0: ns9360fb frame buffer device NS9750 Watchdog initialized Serial: NS9750 driver $Revision: 1.2 $ ttyS1 at MMIO 0xf9200040 (irq = 36) is a NS9750 io scheduler noop registered io scheduler anticipatory registered io scheduler deadline registered io scheduler cfq registered RAMDISK driver initialized: 16 RAM disks of 4096K size 1024 blocksize loop: loaded (max 8 devices) nbd: registered device at major 43 Setting GPIOs for NS9360 ethernet Ethernet: NS9750 driver $Revision: 1.1 $ ns9360_map Using NOR Flash device: 4096 kB @ 0x50000000 NOR Flash memory mapped to virtual c1880000 AM29LV160DB: Found 2 x16 devices at 0x0 in 32-bit bank Amd/Fujitsu Extended Query Table at 0x0040 number of CFI chips: 1 cfi_cmdset_0002: Disabling erase-suspend-program due to code brokenness. ns9360_map: using static partition definition Creating 3 MTD partitions on "AM29LV160DB": 0x00000000-0x00040000 : "U-boot" 0x00040000-0x00180000 : "kernel" 0x00180000-0x00400000 : "initrd" ns9360-ohci ns9360-ohci0: new USB bus registered, assigned bus number 1 hub 1-0:1.0: USB hub found hub 1-0:1.0: 1 port detected Initializing USB Mass Storage driver... usbcore: registered new driver usb-storage USB Mass Storage support registered. usb 1-1: new full speed USB device using ns9360-ohci and address 2 hub 1-1:1.0: USB hub found hub 1-1:1.0: 4 ports detected usbcore: registered new driver usbhid drivers/usb/input/hid-core.c: v2.0:USB HID core driver mice: PS/2 mouse device common for all mice i2c /dev entries driver NET: Registered protocol family 2 IP: routing cache hash table of 512 buckets, 4Kbytes TCP established hash table entries: 1024 (order: 1, 8192 bytes) TCP bind hash table entries: 1024 (order: 0, 4096 bytes) TCP: Hash tables configured (established 1024 bind 1024) NET: Registered protocol family 1 NET: Registered protocol family 17 RAMDISK: ext2sb->s_magic=e79b RAMDISK: ext2sb->s_inodes_count=e121f003 RAMDISK: ext2sb->s_blocks_count=e5903014 RAMDISK: ext2sb->s_r_blocks_count=e2433001 RAMDISK: ext2sb->s_free_blocks_count=e5803014 RAMDISK: cpu_to_le16(EXT2_SUPER_MAGIC)=ef53 RAMDISK: start_block=0 RAMDISK: Couldn't find valid RAM disk image starting at 0. Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(1,0)

Is there anything which I have missed out or done wrong?

Regards