Fail to pass .cpio.gz into kernel

kaylessa · 12-20-2011, 01:05 AM

Hi,

I currently trying to use external initramfs image. But it fail. Anyone got any advise?

below is the error log.

VFS: Cannot open root device "<NULL>" or unknown-block(0,0)
Please append a correct "root=" boot option
Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0)

But if i embed the initramfs into my kernel it work.

jb_gpk · 12-23-2011, 07:55 PM

Quote:

I currently trying to use external initramfs image. But it fail. Anyone got any advise?

what do you mean by "external initramfs image"?

Quote:

Please append a correct "root=" boot option

this tells what is the cause of the error: you did not passed the root= boot option
if you do not pass this option the kernel doesn't know where is your "/" directory

Quote:

But if i embed the initramfs into my kernel it work.

what do you mean by "embed the initramfs into the kernel"?

theNbomr · 12-27-2011, 12:32 PM

Quote:

Originally Posted by kaylessa

I currently trying to use external initramfs image. But it fail.

Please show us how you are using the external initramfs. In my experience, it is normally the role of the bootloader to load the RAM fileystem before loading and launching the kernel. How that is accomplished is bootloader-specific.

--- rod.

kaylessa · 12-29-2011, 02:11 AM

I have initramfs.cpio.gz. I combine this .cpio.gz with my kernel. It boot up successfully.

Now i want to separate it. By loading initramfs..cpio.gz and kernel. But it keep failing.

I tried uboot command. 'bootm $(default_kernel_addr) $(default_initrd_addr)'. It have bad magic number.

Could anyone advise?

I also tried the traditonal method by using initrd. It fail too.