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

[Christian Zigotzky]

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:
> > > /*
> > > Â *Â DMA addressing mode.
> > > Â *
> > > Â *Â 0 : 32 bit addressing for all chips.
> > > Â *Â 1 : 40 bit addressing when supported by chip.
> > > Â *Â 2 : 64 bit addressing when supported by chip,
> > > Â *ÂÂÂÂÂ limited to 16 segments of 4 GB -> 64 GB max.
> > > Â */
> > > #defineÂÂ SYM_CONF_DMA_ADDRESSING_MODE 
> > > CONFIG_SCSI_SYM53C8XX_DMA_ADDRESSING_MODE
> > >
> > > Cyrus config:
> > >
> > > CONFIG_SCSI_SYM53C8XX_DMA_ADDRESSING_MODE=1
> > >
> > > I will configure â0 : 32 bit addressing for all chipsâ 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. ;-)