Re: /dev/hdl not showing up because offix-ide-probe-double-detection patch

[Andrew Morton]

Tupshin Harper1 <tupshin@xxxxxxxxxxx> wrote:
>
> Tupshin Harper1 wrote:
> 
> > I have an x86 setup with a large(9) number of ide hard drives. With 
> > 2.6.8-rc2, all of them show up (as a,b,d,e,f,g,h,i,j,k, and l), but on 
> > 2.6.8-rc2-mm1, the last one (hdl) does not show up, even though it's a 
> > slave on the same controller as hdk. Everything about the config is 
> > identical between the two. Is there some default limit or other 
> > restriction in the current mm kernels that's preventing that drive 
> > from showing up? I haven't tried any other recent mm kernels, so I 
> > don't know when this was introduced.
> >
> > -Tupshin
> 
> Well, I found the source of the problem. Dmesg gives a "ignoring 
> undecoded slave" message, which is coming from the 
> fix-ide-probe-double-detection patch.

Ah, thanks for working that out.

Did you know that Cc: stands for "copy culprit"?

> Both /dev/hdk and /dev/hdl are the same model of hard drive, and 
> unfortunately, they both report that they are Model 
> M0000000000000000000, which triggers the double detection removal.
> 
> Does anybody have a suggestion (besides maintaining my own kernel 
> without this patch)? Is the serial number settable? Is there a boot 
> param I can use?
> 
> Also, what is in /proc/ide/hd?/identity besides serial number. The two 
> drives have very similar identity files, but they are slightly 
> different. Could that additional info be used to check for duplicates?
> 
> -Tupshin
> 
> ---snippet from dmesg---
> PDC20276: IDE controller at PCI slot 0000:00:0c.0
> ACPI: PCI interrupt 0000:00:0c.0[A] -> GSI 19 (level, low) -> IRQ 19
> PDC20276: chipset revision 1
> PDC20276: 100% native mode on irq 19
>     ide4: BM-DMA at 0xdc00-0xdc07, BIOS settings: hdi:pio, hdj:pio
>     ide5: BM-DMA at 0xdc08-0xdc0f, BIOS settings: hdk:pio, hdl:pio
> hdi: SAMSUNG SV8004H, ATA DISK drive
> hdj: Maxtor 6Y250P0, ATA DISK drive
> ide4 at 0xec00-0xec07,0xe802 on irq 19
> hdk: Maxtor 4R120L0, ATA DISK drive
> hdl: Maxtor 4R120L0, ATA DISK drive
> ide-probe: ignoring undecoded slave
> ide5 at 0xe400-0xe407,0xe002 on irq 19
> 
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