CFI ident problems with AMD chips.

Alice Hennessy ahennessy at
Tue Jan 2 18:27:03 EST 2001

David Woodhouse wrote:

> On Tue, 2 Jan 2001, Alice Hennessy wrote:
> > > Is there some way to tell the top-boot parts apart from the bottom-boot
> > > parts?
> >
> > In the Am29DL322D/323D/324D spec, there's  a Top/Bottom Boot Sector Flag at
> > the end of the Primary Vendor-Specific Extended Query at address 4F (word mode)
> >
> > where 02 = bottom, 03 = top.   I haven't tried it  yet.
> Ah - hadn't found that bit, thanks. I'll poke at it in the morning.
> So, are the chips violating the CFI spec by recording the blocks in a
> strange order, or does the CFI spec not actually guarantee an _ordering_
> on the erase regions? It's not clear which is the case - either way,
> _someone_ seems to be on crack here.
> --
> dwmw2

I don't see any specific language that states that the regions have to be in order
(too obvious to mention).

BTW,  I tried it and it gives the correct value for my top boot device.


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