linux-kernel - Re: [BISECTED REGRESSION] b43legacy broken on G4 PowerBook

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Message-ID: <20190606093149.GA11598@darkstar.musicnaut.iki.fi>
Date:   Thu, 6 Jun 2019 12:31:49 +0300
From:   Aaro Koskinen <aaro.koskinen@....fi>
To:     Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc:     Christoph Hellwig <hch@....de>,
        Christian Zigotzky <chzigotzky@...osoft.de>,
        Michael Ellerman <mpe@...erman.id.au>,
        Larry Finger <Larry.Finger@...inger.net>,
        linuxppc-dev@...ts.ozlabs.org, linux-wireless@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [BISECTED REGRESSION] b43legacy broken on G4 PowerBook

Hi,

On Thu, Jun 06, 2019 at 10:54:51AM +1000, Benjamin Herrenschmidt wrote:
> On Thu, 2019-06-06 at 01:50 +0300, Aaro Koskinen wrote:
> > Hi,
> > 
> > When upgrading from v5.0 -> v5.1 on G4 PowerBook, I noticed WLAN does
> > not work anymore:
> > 
> > [   42.004303] b43legacy-phy0: Loading firmware version 0x127, patch level 14 (2005-04-18 02:36:27)
> > [   42.184837] b43legacy-phy0 debug: Chip initialized
> > [   42.184873] b43legacy-phy0 ERROR: The machine/kernel does not support the required 30-bit DMA mask
> > 
> > The same happens with the current mainline.
> 
> How much RAM do you have ?

The system has 1129 MB RAM. Booting with mem=1G makes it work.

A.