Re: Increasing IDE Channels

[Kronos]

John W. Ross <programming@xxxxxxxxxxxxx> ha scritto:
> Greetings,
> 
> I've spent several days working to increase the number of IDE channels above
> the 10 allowed in the kernel.
[cut]
> Changed ide.h:
> 
> IDE_NR_PORTS  (10)
> to
> IDE_NR_PORTS  (12)
> 
> In major.h I added:
> 
> #define IDE10_MAJOR     240
> #define IDE11_MAJOR     241
> 
> in ide.c I changed
> 
> static const u8 ide_hwif_to_major[] = { IDE0_MAJOR, IDE1_MAJOR,
>     IDE2_MAJOR, IDE3_MAJOR,
>     IDE4_MAJOR, IDE5_MAJOR,
>     IDE6_MAJOR, IDE7_MAJOR,
>     IDE8_MAJOR, IDE9_MAJOR };
> 
> to :
> 
> static const u8 ide_hwif_to_major[] = { IDE0_MAJOR, IDE1_MAJOR,
>     IDE2_MAJOR, IDE3_MAJOR,
>     IDE4_MAJOR, IDE5_MAJOR,
>     IDE6_MAJOR, IDE7_MAJOR,
>     IDE8_MAJOR, IDE9_MAJOR,
>     IDE10_MAJOR, IDE11_MAJOR)
> 
 
> 1.) Could someone please explain why there is a limit of 10 interfaces (is
> this something that I shouldn't even try)?

Because hwifs are statically allocated, see drivers/ide/ide.c:

ide_hwif_t ide_hwifs[MAX_HWIFS];        /* master data repository */

Also if names are ide0..ide9, the following would be ide: and ide; (see
init_hwif_data in drivers/ide/ide.c).

> 2.)What did I miss on moving to 12?

You can try and set MAX_HWIFS to 12 too (see include/asm-i386/ide.h),
but you may find other problems.

I don't know ide layer very much, I'm sorry but I can't help you more.

Luca
-- 
Home: http://kronoz.cjb.net
Non capisco tutta questa eccitazione per il Multitasking: 
io sono anni che leggo in bagno.
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