David P. Reed wrote:
H. Peter Anvin wrote:As support: port 80 on the reporter's (my) HP dv9000z laptop clearly responds to reads differently than "unused" ports. In particular, an inb takes 1/2 the elapsed time compared to a read to "known" unused port 0xed - 792 tsc ticks for port 80 compared to about 1450 tsc ticks for port 0xed and other unused ports (tsc at 800 MHz).Rene Herman wrote:I do not know how universal that is, but _reading_ port 0xf0 might in fact be sensible then? And should even work on a 386/387 pair? (I have a 386/387 in fact, although I'd need to dig it up).No. Someone might have used 0xf0 as a readonly port for other uses.
Any timings for port 0xf0 (write zero), out of curiosity? -hpa -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
- Follow-Ups:
- Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay override.
- From: "David P. Reed" <[email protected]>
- Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay override.
- References:
- Re: [PATCH] x86_64: fix problems due to use of "outb" to port 80 on some AMD64x2 laptops, etc.
- From: "H. Peter Anvin" <[email protected]>
- Re: [PATCH] x86_64: fix problems due to use of "outb" to port 80 on some AMD64x2 laptops, etc.
- From: Pavel Machek <[email protected]>
- Re: [PATCH] x86_64: fix problems due to use of "outb" to port 80 on some AMD64x2 laptops, etc.
- From: "H. Peter Anvin" <[email protected]>
- Re: [PATCH] x86_64: fix problems due to use of "outb" to port 80 on some AMD64x2 laptops, etc.
- From: Alan Cox <[email protected]>
- Re: [PATCH] x86_64: fix problems due to use of "outb" to port 80 on some AMD64x2 laptops, etc.
- From: Paul Rolland <[email protected]>
- Re: [PATCH] x86_64: fix problems due to use of "outb" to port 80 on some AMD64x2 laptops, etc.
- From: Rene Herman <[email protected]>
- Re: [PATCH] x86_64: fix problems due to use of "outb" to port 80 on some AMD64x2 laptops, etc.
- From: "H. Peter Anvin" <[email protected]>
- [PATCH] x86: fix problems due to use of "outb" to port 80 on some AMD64x2 laptops, etc.
- From: Rene Herman <[email protected]>
- Re: [PATCH] x86: fix problems due to use of "outb" to port 80 on some AMD64x2 laptops, etc.
- From: "H. Peter Anvin" <[email protected]>
- [PATCH] x86: provide a DMI based port 0x80 I/O delay override.
- From: Rene Herman <[email protected]>
- Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay override.
- From: Ingo Molnar <[email protected]>
- Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay override.
- From: Rene Herman <[email protected]>
- Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay override.
- From: "H. Peter Anvin" <[email protected]>
- Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay override.
- From: Rene Herman <[email protected]>
- Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay override.
- From: "H. Peter Anvin" <[email protected]>
- Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay override.
- From: Rene Herman <[email protected]>
- Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay override.
- From: "H. Peter Anvin" <[email protected]>
- Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay override.
- From: "David P. Reed" <[email protected]>
- Re: [PATCH] x86_64: fix problems due to use of "outb" to port 80 on some AMD64x2 laptops, etc.
- Prev by Date: Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay override.
- Next by Date: Re: [PATCH] include/asm-arm/: Spelling fixes
- Previous by thread: Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay override.
- Next by thread: Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay override.
- Index(es):
 |