Hi All, I am using MIPS32 AU1350 processor board with 2MB of NOR Flash, I have programmed u-boot and Linux kernel in NOR Flash. U-boot is working able to boot linux kernel but not able to mount root filesystem from SDRAM.

I tried both initramdisk and initramfs. please let me know more info about this.

I have created uRamdisk and also passed boot arguments.

Below is the error log. let me know whether I am missing something.

U-Boot 2010.03 (May 28 2010 - 21:01:02)

Linux Advanced AVN Platform CPU: Au1350 660MHz, id: 0x80, rev: 0x01 DRAM: 256 MB Flash: 2 MB *** Warning - bad CRC, using default environment

In: serial Out: serial Err: serial LinuxAVN=> loadb 0x81000000 ## Ready for binary (kermit) download to 0x81000000 at 0 bps...

(Back at localhost) ---------------------------------------------------- (/home/gurumurthy/Downloads/kermit/) C-Kermit>send /tftpboot/rdImage (/home/gurumurthy/Downloads/kermit/) C-Kermit>\c Connecting to /dev/ttyS0, speed 115200 Escape character: Ctrl-\ (ASCII 28, FS): enabled Type the escape character followed by C to get back, or followed by ? to see other options. ---------------------------------------------------- ## Total Size = 0x002ed937 = 3070263 Bytes ## Start Addr = 0x81000000 LinuxAVN=> imls Legacy Image at BFC50000: Image Name: Linux-2.6.28.1 Created: 2010-06-02 11:38:32 UTC Image Type: MIPS Linux Kernel Image (gzip compressed) Data Size: 1134559 Bytes = 1.1 MB Load Address: 80100000 Entry Point: 80104730 Verifying Checksum ... OK LinuxAVN=> iminfo 0x81000000

## Checking Image at 81000000 ... Legacy image found Image Name: Created: 2010-06-02 11:11:16 UTC Image Type: MIPS Linux RAMDisk Image (gzip compressed) Data Size: 3070199 Bytes = 2.9 MB Load Address: 00000000 Entry Point: 00000000 Verifying Checksum ... OK LinuxAVN=> setenv bootargs console=ttyS0,115200 root=/dev/ram0 rw LinuxAVN=> printenv baudrate=115200 stdin=serial stdout=serial stderr=serial filesize=2ED937 bootargs=console=ttyS0,115200 root=/dev/ram0 rw

Environment size: 121/65532 bytes LinuxAVN=> baudrate=115200 stdin=serial stdout=serial stderr=serial filesize=2ED937 bootargs=console=ttyS0,115200 root=/dev/ram0 rw

Environment size: 121/65532 bytes LinuxAVN=> baudrate=115200 stdin=serial stdout=serial stderr=serial filesize=2ED937 bootargs=console=ttyS0,115200 root=/dev/ram0 rw

Environment size: 121/65532 bytes LinuxAVN=> baudrate=115200 stdin=serial stdout=serial stderr=serial filesize=2ED937 bootargs=console=ttyS0,115200 root=/dev/ram0 rw

Environment size: 121/65532 bytes LinuxAVN=> bootm ## Booting kernel from Legacy Image at 81000000 ... Image Name: Created: 2010-06-02 11:11:16 UTC Image Type: MIPS Linux RAMDisk Image (gzip compressed) Data Size: 3070199 Bytes = 2.9 MB Load Address: 00000000 Entry Point: 00000000 Verifying Checksum ... OK Wrong Image Type for bootm command ERROR: can't get kernel image! LinuxAVN=> LinuxAVN=> LinuxAVN=> bootm 0xbfc50000 0x81000000 ## Booting kernel from Legacy Image at bfc50000 ... Image Name: Linux-2.6.28.1 Created: 2010-06-02 11:38:32 UTC Image Type: MIPS Linux Kernel Image (gzip compressed) Data Size: 1134559 Bytes = 1.1 MB Load Address: 80100000 Entry Point: 80104730 Verifying Checksum ... OK ## Loading init Ramdisk from Legacy Image at 81000000 ... Image Name: Created: 2010-06-02 11:11:16 UTC Image Type: MIPS Linux RAMDisk Image (gzip compressed) Data Size: 3070199 Bytes = 2.9 MB Load Address: 00000000 Entry Point: 00000000 Verifying Checksum ... OK Uncompressing Kernel Image ... OK

Starting kernel ...

Linux version 2.6.29.4-rmi-126-DB1350 (root@gurumurthy) (gcc version 4.2.4) #31 Wed Jun 2 17:05:36 IST 2010 console [early0] enabled CPU revision is: 800c8001 (Au13xx) (PRId 800c8001) @ 660.00 MHz RMI DBAu1300 Development Board Determined physical RAM map: memory: 01800000 @ 00000000 (usable) memory: 0c800000 @ 01800000 (reserved) memory: 02000000 @ 0e000000 (usable) Initrd not found or empty - disabling initrd Zone PFN ranges: Normal 0x00000000 -> 0x00010000 HighMem 0x00010000 -> 0x00010000 Movable zone start PFN for each node early_node_map[1] active PFN ranges 0: 0x00000000 -> 0x00010000 Built 1 zonelists in Zone order, mobility grouping on. Total pages: 65024 Kernel command line: console=ttyS0,115200 root=/dev/ram0 rw video=au1200fb:panel:bs Primary instruction cache 16kB, VIPT, 4-way, linesize 32 bytes. Primary data cache 16kB, 4-way, VIPT, no aliases, linesize 32 bytes PID hash table entries: 1024 (order: 10, 4096 bytes) Alchemy clocksource installed Console: colour dummy device 80x25 Dentry cache hash table entries: 32768 (order: 5, 131072 bytes) Inode-cache hash table entries: 16384 (order: 4, 65536 bytes) Memory: 51012k/57344k available (1899k kernel code, 5988k reserved, 490k data, 152k init, 0k highmem) Calibrating delay loop... 658.63 BogoMIPS (lpj=3293184) Mount-cache hash table entries: 512 Hooking cpu_wait bio: create slab <bio-0> at 0 SCSI subsystem initialized Creating sysfs entry for board Alchemy MEMPOOL initializing Alchemy MEMPOOL registered at major 235 Available memory pools: LCD: 40 MB @ phys 0x01800000, free BSA: 64 MB @ phys 0x04000000, free MPE: 32 MB @ phys 0x08000000, free OGL: 64 MB @ phys 0x0a000000, free squashfs: version 4.0 (2009/01/31) Phillip Lougher msgmni has been set to 100 alg: No test for stdrng (krng) io scheduler noop registered (default) io scheduler anticipatory registered io scheduler deadline registered io scheduler cfq registered Serial: 8250/16550 driver, 4 ports, IRQ sharing disabled )console handover: boot [early0] -> real [ttyS0]) is a 8250 brd: module loaded Driver 'sd' needs updating - please use bus_type methods Driver 'sr' needs updating - please use bus_type methods List of all partitions: No filesystem could mount root, tried: ext3 ext2 cramfs squashfs vfat msdos Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(1,0)

With Regards, Gurumurthy