* erase / interrupts
@ 2001-05-21 12:28 Jochen Schaeuble
2001-05-21 12:32 ` David Woodhouse
0 siblings, 1 reply; 2+ messages in thread
From: Jochen Schaeuble @ 2001-05-21 12:28 UTC (permalink / raw)
To: linux-mtd
I have two questions. First of all, what happens to the interrupts during
an erase? Are they disabled?
The other one is, what happens if the power fails during a erase/write. Does
the init-code handle the reset of the chip?
Thx
Jochen
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: erase / interrupts
2001-05-21 12:28 erase / interrupts Jochen Schaeuble
@ 2001-05-21 12:32 ` David Woodhouse
0 siblings, 0 replies; 2+ messages in thread
From: David Woodhouse @ 2001-05-21 12:32 UTC (permalink / raw)
To: psionic; +Cc: linux-mtd
psionic@psionic.de said:
> I have two questions. First of all, what happens to the interrupts
> during an erase? Are they disabled?
That's entirely dependent on the driver. In general, interrupts _shouldn't_
be disabled. They aren't disabled in the cfi_cmdset_000[12] drivers.
The erase method may sleep. And it may return immediately, calling the
erase completion callback later, from a timer. That isn't implemented yet.
Of course, it's entirely permitted to do both.
> The other one is, what happens if the power fails during a erase/write.
> Does the init-code handle the reset of the chip?
Yes, it should do. It's up the the application to work out the the sector
in question was partially erased and erase it properly. See the marker
nodes in JFFS2.
--
dwmw2
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