linux-kernel - Re: Bug 205201 - Booting halts if Dawicontrol DC-2976 UW SCSI board installed, unless RAM size limited to 3500M

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Date:   Thu, 21 Nov 2019 08:29:43 +0100
From:   Christoph Hellwig <hch@....de>
To:     Christian Zigotzky <chzigotzky@...osoft.de>
Cc:     Christoph Hellwig <hch@....de>, linux-arch@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        iommu@...ts.linux-foundation.org,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        paulus@...ba.org, darren@...vens-zone.net,
        "contact@...on.com" <contact@...on.com>, rtd2@...a.co.nz,
        mad skateman <madskateman@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
        nsaenzjulienne@...e.de
Subject: Re: Bug 205201 - Booting halts if Dawicontrol DC-2976 UW SCSI
 board installed, unless RAM size limited to 3500M

On Sat, Nov 16, 2019 at 08:06:05AM +0100, Christian Zigotzky wrote:
> /*
>  *  DMA addressing mode.
>  *
>  *  0 : 32 bit addressing for all chips.
>  *  1 : 40 bit addressing when supported by chip.
>  *  2 : 64 bit addressing when supported by chip,
>  *      limited to 16 segments of 4 GB -> 64 GB max.
>  */
> #define   SYM_CONF_DMA_ADDRESSING_MODE CONFIG_SCSI_SYM53C8XX_DMA_ADDRESSING_MODE
> 
> Cyrus config:
> 
> CONFIG_SCSI_SYM53C8XX_DMA_ADDRESSING_MODE=1
> 
> I will configure “0 : 32 bit addressing for all chips” for the RC8. Maybe this is the solution.

0 means you are going to do bounce buffering a lot, which seems
generally like a bad idea.

But why are we talking about the sym53c8xx driver now?  The last issue
you reported was about video4linux allocations.