Re: Tablet PC + 2.4.18 + acpi 20020726 + swsup11 working !

["Robert Wörle" <robert.woerle-y2s3ugBAdl9BDgjK7y7TUQ@public.gmane.org>]

Randy.Dunlap schrieb:

>On Tue, 6 Aug 2002, Robert Wörle wrote:
>
>| Ducrot Bruno schrieb:
>|
>| >On Tue, Aug 06, 2002 at 03:28:27PM +0200, Jörg Sonnenberger wrote:
>| >
>| >
>| >>Am Dienstag, 6. August 2002 14:04 schrieb Robert Wörle:
>| >>
>| >>
>| >>>So what is this pci1 and pic2 thing ??? and why is it residing at my
>| >>>wanted IO ???
>| >>>
>| >>>
>| >>Let me guess: PIC = Programmable Interrupt Controller,
>| >>so I think you don't wanna mess with it! The interesting question is, why is
>| >>your device in this range? This ports are reserved since the days of IBM's
>| >>good old AT.
>| >>
>| >>
>| >>
>| >
>| >Well, not all those ports are used by the original 8259A.  And the PIC 2, is
>| >'only' at range A0-AF, according to Ralf Brown list.  Linux extend it a little,
>| >but I don't know why.
>| >
>| >
>| >
>| Tell me guys , what driver is this pic2 .. where can i found the
>| according **.c to have some try`S and modify it
>| so if it doesnt need these ports then i can use them for my purposes ...
>
>The IO space for PIC1 and PIC2 is reserved in
>linux/arch/i386/kernel/setup.c, around line 330 in 2.4.18/2.4.19,
>in the array standard_io_resources[].
>You might be able to make the granularity of that definition
>finer so that some of the IO addresses aren't reserved.
>  
>
Thank you , i found it at setup.c ... and i ll now try to free my needed 
area with something like this:
{"pic2",0xa0,0xb0,IORESOURCE_BUSY},
("pic2",0xb3,0xbf,IORESOURCE_BUSY},----
after that i should (=?!) have 0xb1-0xb2 free to be mapped by my driver ...

>Regarding someone else's email about Linux using only addresses
>0xa0 and 0xa1 for PIC2:
>That's probably correct.  The PIC internal registers are addressed
>by ICWn and OCWn, which are dependent on the data values written.
>The other IO addresses that are reserved (like 0xa4-5, 0xa8-9,
>0xac-d, 0xb0-1, 0xb4-5, 0xb8-9, 0xbc-d) are ghosts (duplicates)
>of the base IO addresses (0xa0-0xa1), due to incomplete IO address
>line decoding.
>
>  
>


-- 
 
_____________________________________
*Robert Wörle
 Linux | Embedded Device*
*
Symplon AG*

*...touch the internet*

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