I've had a few beer long discussion with Joern Engel and David
Woodhouse on this one. To cut a long discussion short: the current XIP
infrastructure is not sufficient to be used on top of mtd. We'd need
some extenstions:
- on get_xip_page() we'd need to state if we want the reference
read-only or read+write
- we need a put_xip_page() to return references
- and finally we need a callback for the referece, so that the mtd
driver can ask to get its reference back (in order to unmap from
userland when erasing a block)
Yes. And one more thing. We can't assume every page in a file is XIP or not.
However, I still can't get even the existing get_xip_page() to work
for me so we are getting ahead of ourselves;) Looking back on this
thread I realize I haven't confirmed if my cramfs_get_xip_page() gets
a page struct. I assume that is my problem? The UML find_iomem()
probably returns psuedo iomem with page structs. While ioremap() does
not return with page struct backed memory.
-
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