[Yaffs-archive] [YAFFS]Re: Semaphore in nandmtd_EraseBlockInNAND

[Charles Manning]

On Fri, 04 Apr 2003 20:38, Steve Tsai wrote:
> Why was semaphore used in function nandmtd_EraseBlockInNAND?
>
> Steve Tsai
>
The semaphore is not required for NAND and has now been removed in 
yaffs_mtdif.c in CVS.

I expect this feature is in the interface for NOR flash. NOR flash takes a 
long time to erase, so the erase call returns before the erase is complete. 
You can then use erase suspend to suspend the erase and do accesses to the 
chip. The callback is then called to tell you that the erase is complete.

Since NAND does not have erase suspend, and the erases are fast, the callback 
is not required.

-- CHarles


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