Writing emmc write-protected area gives no error, though the protection is working

[Jongman Heo <jongman.heo@xxxxxxxxxxx>]

Hi all,

I've tested (temporary) write-protection feature of eMMC flash.

   #1. set the temporary write-protection (using CMD28)
   #2. write data to the write-protected area  (using dd or similar)
     -> gives no error at all.
   #3. checking the area confirms that write-protection is working, data is not over-written.

In step #2, I expected some error return, but no. Obviously write-protection is working, but user can't see any visible output.

Shouldn't write(2) return some error for above case?

Jongman.


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