linux-kernel - Re: [PATCH 9/9] MN10300: Fix MTD JEDEC probe so that the ASB2303 bootprom can be detected [2.6.24-rc3-mm2]

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Message-Id: <1196435193.13978.35.camel@pmac.infradead.org>
Date:	Fri, 30 Nov 2007 15:06:33 +0000
From:	David Woodhouse <dwmw2@...radead.org>
To:	David Howells <dhowells@...hat.com>
Cc:	thayne@...g.org, akpm@...ux-foundation.org,
	linux-am33-list@...hat.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 9/9] MN10300: Fix MTD JEDEC probe so that the ASB2303
	bootprom can be detected [2.6.24-rc3-mm2]


On Fri, 2007-11-30 at 14:01 +0000, David Howells wrote:
> David Woodhouse <dwmw2@...radead.org> wrote:
> 
> > I don't like this -- it shouldn't be necessary.
> 
> Actually, I think you're right.  I think the problem is that:
> 
>         if (uaddr != MTD_UADDR_NOT_SUPPORTED ) {
>                 /* ASSERT("The unlock addresses for non-8-bit mode
>                    are bollocks. We don't really need an array."); */
>                 uaddr = finfo->uaddr[0];
>         }
> 
> Should be:
> 
>         if (uaddr == MTD_UADDR_NOT_SUPPORTED ) {
>                 /* ASSERT("The unlock addresses for non-8-bit mode
>                    are bollocks. We don't really need an array."); */
>                 uaddr = finfo->uaddr[0];
>         }

Nah, it does what it's supposed to. Really, the only information in the
uaddr[] array is the information about what widths are supported, and
the _first_ unlock address is the only one we should care about.

It should change to a bitmask for the widths which are supported, and a
single int for the uaddr.

> Otherwise the finfo->uaddr[] table is useless because only the first row will
> be used, except for unsupported configurations where uaddr will be set to
> MTD_UADDR_NOT_SUPPORTED.

That is basically the assertion being made, yes. And it's true -- which
is why I didn't want you removing it ;)

> With the ASB2303 bootprom I need to use the second row because it's in the x16
> configuration, *not* the x8.

No, you need to use the second row because the first row is incorrect.
It ought to contain what's in the second row. :)

-- 
dwmw2

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