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Thu, 21 Nov 2019 13:21:24 +0100 (CET) Subject: Re: Bug 205201 - Booting halts if Dawicontrol DC-2976 UW SCSI board installed, unless RAM size limited to 3500M From: Christian Zigotzky To: Christoph Hellwig Cc: linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, iommu@lists.linux-foundation.org, Benjamin Herrenschmidt , paulus@samba.org, darren@stevens-zone.net, "contact@a-eon.com" , rtd2@xtra.co.nz, mad skateman , Rob Herring , linuxppc-dev , nsaenzjulienne@suse.de References: <20191121072943.GA24024@lst.de> Message-ID: <6eec5c42-019c-a988-fc2a-cb804194683d@xenosoft.de> Date: Thu, 21 Nov 2019 13:21:23 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.9.1 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: de-DE Content-Transfer-Encoding: quoted-printable X-Bogosity: Ham, tests=bogofilter, spamicity=0.003979, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: 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: >>> /* >>> =C2=A0 *=C2=A0 DMA addressing mode. >>> =C2=A0 * >>> =C2=A0 *=C2=A0 0 : 32 bit addressing for all chips. >>> =C2=A0 *=C2=A0 1 : 40 bit addressing when supported by chip. >>> =C2=A0 *=C2=A0 2 : 64 bit addressing when supported by chip, >>> =C2=A0 *=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 limited to 16 segments of 4 GB= -> 64 GB max. >>> =C2=A0 */ >>> #define=C2=A0=C2=A0 SYM_CONF_DMA_ADDRESSING_MODE=20 >>> CONFIG_SCSI_SYM53C8XX_DMA_ADDRESSING_MODE >>> >>> Cyrus config: >>> >>> CONFIG_SCSI_SYM53C8XX_DMA_ADDRESSING_MODE=3D1 >>> >>> I will configure =E2=80=9C0 : 32 bit addressing for all chips=E2=80=9D= for the RC8.=20 >>> 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?=C2=A0 The last = issue >> you reported was about video4linux allocations. >> > Both drivers have the same problem. They don't work if we have more=20 > than 3.5GB RAM. I try to find a solution until you have a good=20 > solution. I have already a solution for V4L but I still need one for=20 > the sym53c8xx driver. OK, you mean that "0" is a bad idea but maybe it works until you have a=20 solution. ;-)