Are erase suspends possible?

[Derek Ross]

> dross at iders.ca said:
> > I was looking through the code in  cfi_cmdset_0001.c, and it appears
> > that erase suspends are not implemented. Is this correct? 
> 
> No. Erase suspend has been working for ages. What version of 
> cfi_cmdset_0001.c are you looking at?

Sorry, I'm still wrapping my brain around mtd.

I'm looking at a recent version, and it has
the function "cfi_intelext_suspend".

I was also looking at the function "do_write_oneword", and
internally, it seems to halt if an erase is in progress.

Also, the function, do_erase_oneblock seems to 
block during the erase.

What would be good for my application is if there
were two more functions:

"do_erase_oneblock_dont_wait",
which doesn't wait for the erase to finish, and
returns immediately,

and

"do_write_oneword_suspend_if_needed",
which will always write without delay, even
if it has to suspend an erase that's in progress.

I'm sure it wouldn't be difficult to write these
extra functions (especially "do_write_oneword_suspend_if_needed", 
which would just need an call to "cfi_intelext_suspend"), 
but I'm worried that it would 
be impossible to call using /dev/mtd and ioctl calls.

Also, my app will effective deactivate any other 
flash interaction during this phase, so I'm not
worried about JFFS interference.

Thanks,
Derek Ross.