From: David Woodhouse <dwmw2@infradead.org>
To: Srinivasan.Ramasubramaniam@nokia.com
Cc: linux-mtd@lists.infradead.org
Subject: Re: CFI interface !
Date: Mon, 17 Jun 2002 11:09:20 +0100 [thread overview]
Message-ID: <20804.1024308560@redhat.com> (raw)
In-Reply-To: <F252EE46074AB645B4F44947EEAD572730B5D7@mvebe001.NOE.Nokia.com>
Srinivasan.Ramasubramaniam@nokia.com said:
> I am little confused about the CFI interface. As for as i could
> understand, it the interface for the hardware device (chip driver).
> But why is that need to different CFI file like cfi_cmdset_0001.c,
> cfi_cmdset_0002.c etc. Could anybody shed light on it. Thanks in
> advance.
CFI only defines a common interface for _identifying_ flash. The actual
command set used to drive writes/erases/etc is still the same for each
manufacturer as it always was -- so the CFI standard gives them all
'command set' numbers, and we have generic code for probing CFI-compliant
chips, which then passes control to the _real_ commandset-specific
drivers.
Note that because the command sets used now are identical to those of older
pre-CFI chips, we actually probe older non-CFI chips in the old way and then
just pass them into the appropriate CFI command set driver too.
--
dwmw2
prev parent reply other threads:[~2002-06-17 10:09 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-06-17 9:52 CFI interface ! Srinivasan.Ramasubramaniam
2002-06-17 10:09 ` David Woodhouse [this message]
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