linux-kernel - Re: Boot problem on PPC with 4.4-git

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Message-ID: <CAPcyv4gteJmvbhc56xYGeKYw9VhOdu5hEC3-uAtiVtQtdohJ3w@mail.gmail.com>
Date:	Wed, 20 Jan 2016 12:08:26 -0800
From:	Dan Williams <dan.j.williams@...el.com>
To:	Larry Finger <Larry.Finger@...inger.net>
Cc:	LKML <linux-kernel@...r.kernel.org>
Subject: Re: Boot problem on PPC with 4.4-git - Bisected to commit 21266be

On Wed, Jan 20, 2016 at 12:01 PM, Larry Finger
<Larry.Finger@...inger.net> wrote:
> My PowerBook G4 Aluminum with a 32-bit PPC processor fails to boot for the
> 4.4-git series. The problem was bisected to commit 21266be. It took a while
> to figure out why a commit that only rearranges the Kconfig files could
> cause the problem.
>
> The answer came when I read the commit message for 90a545e98126 and saw that
> "Recompiling with CONFIG_IO_STRICT_DEVMEM=n" might be necessary. After I
> made that change, the system boots.
>
> If it is the graphics hardware driver at fault, the VGA controller is listed
> as an ATI RV350 [Mobility Radeon 9600 M10] with PCI ID 1002:4350. It uses
> radeon as the driver.
>
> I'm not sure if this is a bug in the configuration, but I know that
> selecting the default answer to all the new configuration parameters leaves
> me with a machine that is unbootable.

I agree that the default configuration should remain bootable.  I'll
send a change that does not force that default.

Thanks for the report and sorry for the inconvenience.