Messages in this thread | | | From | Darren Hart <> | Subject | PnP Bios activation of parallel port prior to request_region | Date | Thu, 26 Oct 2006 07:59:21 -0700 |
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While working with a very simple demo parallel port interrupt driver, I found that request_region() will successfully return, regardless of whether or not the pnp calls have been made to activite the parallel port on a pnp system.
The driver worked by just calling request_region() on another system, but on my laptop it wouldn't work unless I made the pnp activation calls before hand. The confusion came because the io range got assigned to my module, showed up in /proc/ioports, etc. So it appeared to be properly configured, but all the inb() calls returned 0xff.
I know have something working, but just wanted to ask if it is considered correct behavior for request_region() to succeed on an io range pertaining to a device that needs to be initialized by the pnp system and hasn't been.
-- Darren Hart IBM Linux Technology Center Realtime Linux Team - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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