RE: mtd_info->write

Frederic Giasson
2001-06-06T13:33:03Z

In my opinion, the low level driver does not have to handle validation, it
just have to provide an interface to primitive function. The high level
module ( the user interface part of the driver ) has to do the job. I think
that's the way of MTD people too.

Frederic Giasson

-----Original Message-----
From: Abraham vd Merwe [mailto:abraham@2d3d.co.za]
Sent: Wednesday, June 06, 2001 9:35 AM
To: Frederic Giasson
Cc: MTD for Linux
Subject: Re: mtd_info->write

Hi Frederic!

> I am almost sure that you have to validate the erase state of the sector
you
> want to write to. For example, I use cfi_amdstd_write function, and
> absolutely no validation is made in that fonction for this.

You mean the user process/module has to, not the chip driver? I'm writing a
chip driver and I want to know whether the chip driver is responsible for
the checking.

I noticed the other chip drivers (like you say here) doesn't so I'm assuming
I don't have to but I just want to make sure.

> > If the data is all ones ("1"), it has been erased. If not, it has not.
>
> Yes, I know, but I want to know whether I have to check if that's the case
> or not.
>
> > Can you safely assume in the MTD write function that the blocks on which
> the
> > data is have been erased or do you actually have to do some error
checking
> > and return with -EINVAL if you discover that it's not been erased?

--

Regards
Abraham

Chemistry professors never die, they just fail to react.

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