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

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Date:	Wed, 20 Jan 2016 14:01:45 -0600
From:	Larry Finger <Larry.Finger@...inger.net>
To:	Dan Williams <dan.j.williams@...el.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Boot problem on PPC with 4.4-git - Bisected to commit 21266be

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.

Larry