Thanks for your reply, Jeff.
It turns out there are a couple things stopping MTD, and subsequently JFFS2,
from being enabled in UML, and when I tweak things to enable MTD, sure
enough the build fails.
First, arch/um/Kconfig has
if BROKEN
source "drivers/mtd/Kconfig"
endif
so I need BROKEN set so I can enable MTD and subsequently JFFS2. BROKEN is
defined in init/Kconfig and as far as I can tell requires an edit to that
file to change it. Also, "BROKEN" is to be taken seriously.
Second, arch/um/Kconfig has
config NO_IOMEM
def_bool y
and then in lib/Kconfig:
config HAS_IOMEM
boolean
depends on !NO_IOMEM
default y
and then in drivers/mtd/Kconfig:
menuconfig MTD
tristate "Memory Technology Device (MTD) support"
depends on HAS_IOMEM
and since HAS_IOMEM is false, MTD can't be enabled.
I guess something has changed since JFFS2 apparently worked on
2.4.18-21umin 2002:
http://user-mode-linux.sourceforge.net/old/nesting.html
Oh well. UML was really useful for another project I did, but I'll find
another way for this one.
Thanks,
Tom.
On 9/28/07, Jeff Dike <[EMAIL PROTECTED]> wrote:
>
> On Thu, Sep 27, 2007 at 09:18:53PM -0700, atom ota wrote:
> > I need to do some experiments with JFFS2 on a recent Linux kernel (
> 2.6.22.6)
> > and was hoping to use UML, with block2mtd or nandsim as my MTD, but
> either
> > MTD configuration and consequently JFFS2 configuration isn't available
> in
> > "make ARCH=um menuconfig", or I just can't find it.
>
> Searching for JFFS2_FS in menuconfig gives me this:
>
> Symbol: JFFS2_FS [=n]
> Prompt: Journalling Flash File System v2 (JFFS2) support
> Defined at fs/Kconfig:1222
> Depends on: MTD
> Location:
> -> File systems
> -> Miscellaneous filesystems
> Selects: CRC32
>
> Jeff
>
> --
> Work email - jdike at linux dot intel dot com
>
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