Re: [PATCH] x86_64: fix problems due to use of "outb" to port 80 on some AMD64x2 laptops, etc.

• To: "linux-os (Dick Johnson)" <[email protected]>
• Subject: Re: [PATCH] x86_64: fix problems due to use of "outb" to port 80 on some AMD64x2 laptops, etc.
• From: Rene Herman <[email protected]>
• Date: Mon, 17 Dec 2007 19:54:58 +0100
• Cc: "David P. Reed" <[email protected]>, Avi Kivity <[email protected]>, Thomas Gleixner <[email protected]>, Linux kernel <[email protected]>, Ingo Molnar <[email protected]>, "H. Peter Anvin" <[email protected]>, Pavel Machek <[email protected]>, kvm-devel <[email protected]>
• Domainkey-signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=message-id:date:user-agent:mime-version:to:cc:subject:references:in-reply-to:content-type:content-transfer-encoding:from; b=s5GysvweLGsF3p6tknfpt7/JK2K76a82d7XPyAENuJwfPi7nhk9LOqbG8viEn4Ykvd8ktPBA+m8iTY+B6QN/KqSs9xPtuRbibdiW58zm2SoLNmJAfce7S240CUx3JPs23Hqevi5DezPWyyIz6OUx4mVdnYkgsoUVz02Al8DGlXI=
• In-reply-to: <[email protected]>
• List-id: <linux-kernel.vger.kernel.org>
• References: <[email protected]> <1181682498.8176.224.camel@chaos> <[email protected]> <1184216528.12353.203.camel@chaos> <1184218962.12353.209.camel@chaos> <[email protected]> <1184253339.12353.223.camel@chaos> <[email protected]> <1184274754.12353.254.camel@chaos> <[email protected]> <[email protected]> <[email protected]> <[email protected]>
• Sender: [email protected]
• User-agent: Thunderbird 2.0.0.9 (X11/20071031)

On 17-12-07 19:14, linux-os (Dick Johnson) wrote:

Attached is a patch that changes the outs to ins on port 0x80.

No, that isn't useful. Only a write is "guaranteed" to make ISA/LPC meaning the timing for a read varies wildly. See the in/out cycles results posted earlier. Was also reading the Intel PIIX(3) chiset datasheet today which specifically mentions that only writes flow through to ISA, reads do not.

Rene.
--
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/

---

• References:
  • [PATCH] x86_64: fix problems due to use of "outb" to port 80 on some AMD64x2 laptops, etc.
    • 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.
    • From: Avi Kivity <[email protected]>
  • Re: [PATCH] x86_64: fix problems due to use of "outb" to port 80 on some AMD64x2 laptops, etc.
    • 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.
    • From: "linux-os (Dick Johnson)" <[email protected]>

• Prev by Date: [PATCH] AMD Thermal Interrupt Support
• Next by Date: [GIT PATCH] USB fixes for 2.6.24-rc5
• Previous by thread: Re: [PATCH] x86_64: fix problems due to use of "outb" to port 80 on some AMD64x2 laptops, etc.
• Next by thread: Re: [PATCH] x86_64: fix problems due to use of "outb" to port 80 on some AMD64x2 laptops, etc.
• Index(es):
  • Date
  • Thread

[Index of Archives]     [Kernel Newbies]     [Netfilter]     [Bugtraq]     [Photo]     [Stuff]     [Gimp]     [Yosemite News]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux RAID]     [Video 4 Linux]     [Linux for the blind]     [Linux Resources]