Hi,

I am trying to get Linux to boot with U-boot using a flash based initrd image. I am using a Memec Virtex II Pro board which has a Powerpc 405 processor embedded in an FPGA. I have u-boot running. My flash is 8 Megs and is organized as follows:

0xFE000000 - U-boot 0xFE100000 - Linux u-boot kernel (vmlinux.PPCBoot) created using latest sources from ppckernel.org 0xFE200000 - Simple Ramdisk-Image (simple-ramdisk.PPCBoot ) from DENX.de

The boot arguments I pass using u-boot are bootargs=console=ttyS0,115200 mem=32M root=/dev/ram rw

Some relevant kernel configuration parameters are (using xilinx_ml300 as base)

# Block devices CONFIG_BLK_DEV_RAM=y CONFIG_BLK_DEV_RAM_SIZE=4096 CONFIG_BLK_DEV_INITRD=y

# File systems CONFIG_TMPFS=y CONFIG_RAMFS=y

However when I use "bootm fe100000 fe200000" to boot linux, I get all the way to the end of the boot process at which point I get this message:

RAMDISK: Compressed image found at block 0 Freeing initrd memory: 554k freed Kernel panic: VFS: Unable to mount root fs on 01:00

Seems like it located the RAMDISK image but is not able to mount it. Any ideas on what is causing this to occur.

I did a backtrace using gdb over abatron and heres what I get (breakpoints don't seem to work for me though although I can get a stach trace) #0 0xc000678c in __delay () #1 0xc0014734 in panic (fmt=0x1cfde0 <Address 0x1cfde0 out of bounds>) at /home/shamile/ecsi-linux/kernel/src-linuxppc_2_4_devel/include/asm/delay.h:42 #2 0xc00fcac8 in mount_block_root (name=0xc00d5ea4 "/dev/root", flags=32768) at init/do_mounts.c:376 #3 0xc00fd4d4 in mount_root () at init/do_mounts.c:789 #4 0xc0002888 in prepare_namespace () at init/do_mounts.c:917 #5 0xc0002458 in init (unused=0xc2c1) at init/main.c:556 #6 0xc0006f60 in arch_kernel_thread ()

Thanks, Shamile

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