[RFC] Support for > 2Gib MTD

[Bruce_Leonard at selinc.com]

So I'm back to work on this.  My last attempt was shot down in flames 
because I changed the kernel-user space API.  No worries on that.  Got a 
new plan.  Gonna' float it out there BEFORE I put a ton of work into it 
this time.

Here's a rough idea of what I'm thinking.  In .../include/mtd/mtd-abi.h 
add new 64 bit structs like this:

+struct erase_info_user_64 {
+       uint64_t start;
+       uint64_t length;
+}

+struct mtd_info_user_64 {
+       ...
+       uint32_t flags;
+       uint64_t size;
+       ...
+}

These new structs would be identical to the old ones execept for the types 
on a few fields.  To indicate that the new 64 bit interface is to be used 
I would introduce a new flag for 'struct mtd_info_user_XX->flags', 
something like this:

#define MTD_LARGE_SIZE 0x4000

In .../include/linux/mtd.h I would add new fields as follows:

struct erase_info {
        ...
        u_int32 fail_addr;
+       u_int64_t addr_64;
+       u_int64_t len_64;
+       u_int64_t fail_addr_64;
        u_long time;
        ...
}

struct mtd_info {
        ...
        u_int32_t size;
+       u_int64_t size_64;
        u_int32_t erasesize;
        ...
}

Plus a few new IOCTLs for getting info to/from user space if people want 
to use it.

Comments?

Bruce