[U-Boot-Users] How does u-boot inform the linux kernel of a JFFS2 root filesyst em?

[Wolfgang Denk]

In message <9901EE1E8F8BD3119109009027A1B5F596AF68 at DIGINET2> you wrote:
> 
> I can use fsload to load the kernel image into ram, once in ram I can launch
> the kernel using bootm <address of kernel image>. Previously I had been

Correct.

> using a ramdisk arrangement which I configured by launching the kernel with
> a bootm <address of kernel image> <address of ramdisk> and informing the
> kernel within the bootargs of root=/dev/ram, how should I pass the location
> of the root filesystem to the kernel?  

You must pass a "root=/dev/mtdblockX rw" argument  to  Linux.  Either
your  kernel  then  has built-in knowledge about the flash partitions
(via a static mapping driver in drivers/mtd/maps/<board>.c),  or  you
provide  the partition information as part of the boot arguments, see
http://www.denx.de/twiki/bin/view/DULG/BootTimeConfigurationOfMTDPartitions

In general, the DULG contains some hints :-)

Best regards,

Wolfgang Denk

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