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 13:21:23 +0100
From:   Christian Zigotzky <chzigotzky@...osoft.de>
To:     Christoph Hellwig <hch@....de>
Cc:     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 21 November 2019 at 01:16 pm, Christian Zigotzky wrote:
> On 21 November 2019 at 08:29 am, Christoph Hellwig wrote:
>> 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.
>>
> Both drivers have the same problem. They don't work if we have more 
> than 3.5GB RAM. I try to find a solution until you have a good 
> solution. I have already a solution for V4L but I still need one for 
> the sym53c8xx driver.
OK, you mean that "0" is a bad idea but maybe it works until you have a 
solution. ;-)