[RFC] refactoring MTD cmdset ops, jedec_probe, and cfi_probe

[Eric W. Biederman]

Thayne Harbaugh <tharbaugh at lnxi.com> writes:

> On Tue, 2004-07-13 at 08:23 -0600, Eric W. Biederman wrote:
> > David Woodhouse <dwmw2 at infradead.org> writes:
> > 
> > > On Tue, 2004-07-13 at 01:05 -0600, Eric W. Biederman wrote:
> > > > That part does not look to bad...
> > > 
> > > Would be interesting to know if it works though ... :)
> > > 
> > > > Although there has been some error handling from cfi_cmdset_0002.c which
> > > > disturbs me.  Seeing as I'm good at finding flaky NOR flash parts...
> > > 
> > > I assume you mean some error handling _removed_ from cfi_cmdset_0002.c 
> > > 
> > > I don't recall doing that myself... can you elaborate?
> > 
> > Right.  Basically when Thayne was working on cfi_cmdset_0002 we got it stable
> > for the chips we care about.  But the code was so ugly someone rewrote the
> > code.  There were other priorities at the time so we have not been able to
> > get back and fix things up.
> > 
> > The primary thing was that the check that the written data is was what
> > we actually tried to write was removed.
> 
> There's a short list of things that have been removed or changed
> significantly (although this is from memory and may not match the
> current code):
> 
> * read-back check of written data

I have a patch  for that already.  Since we are not checking any other
status bits.  At least verifying the data is correct is useful.  
 
> * retry of failed writes

This one is more interesting.   I don't know if it should be generic or we should
just override do_write_one_word...

One way or another we will get this one back in there.
 
> * unlock address for some chips (although this is likely part of the big
> rewrite)
> 
> In the end, it's much appreciated that everything was cleaned up - there
> were some major things done that I wanted to do but was too timid to do
> major overhauling of the code.  Unfortunately it was just continuing to
> grow harrier and uglier.

Thayne this problem I am not familiar with.  Could I have some details?

Eric