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Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern AMD64 with MCP51 laptops

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To: David P. Reed <dpreed@...>
Cc: Rene Herman <rene.herman@...>, Paul Rolland <rol@...>, David Newall <david@...>, H. Peter Anvin <hpa@...>, Krzysztof Halasa <khc@...>, Pavel Machek <pavel@...>, Andi Kleen <andi@...>, <linux-kernel@...>, Thomas Gleixner <tglx@...>, Ingo Molnar <mingo@...>, <rol@...>
Date: Tuesday, December 11, 2007 - 1:32 pm

> below, from a list of those I needed to patch to eliminate refs to _b 

Because the controllers were historically slower than the CPU and thus
clocked at half bus speed. Various chipsets simply shrank the logic
without fixing this.


Sync with retrace is MDA memory updates.

The vga driver is somewhat misnamed. In console mode we handle everything
back to MDA/HGA and some HGA adapters do need delays.


Because the LPC bus cycles are run at ISA speed. 


All do -thats why it is suitable.


Older Windows does. Don't know about XP although DOS apps in XP will but
they may virtualise the port.


Which requires care. Have you verified all the main chipset vendors ?


All .. none of them ?

I can do some of these off the top of my head


Needed for some 8390 devices on ISA bus


Uses the parallel port which isnt guaranteed to be full ISA speed.


Parallel port


Some PC's need delays for certain ops.


That one is a mistake I believe, I'll dig out the docs.

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Messages in current thread:
Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern A..., linux-os (Dick Johnson), (Tue Dec 11, 11:41 am)
More info on port 80 symptoms on MCP51 machine., David P. Reed, (Wed Dec 12, 4:07 pm)
Re: More info on port 80 symptoms on MCP51 machine., Rene Herman, (Wed Dec 12, 4:26 pm)
Re: More info on port 80 symptoms on MCP51 machine., Rene Herman, (Wed Dec 12, 4:58 pm)
Re: More info on port 80 symptoms on MCP51 machine., H. Peter Anvin, (Wed Dec 12, 5:05 pm)
Re: More info on port 80 symptoms on MCP51 machine., Chuck Ebbert, (Fri Dec 14, 6:05 pm)
Re: More info on port 80 symptoms on MCP51 machine., Rene Herman, (Sat Dec 15, 3:22 am)
Re: More info on port 80 symptoms on MCP51 machine., H. Peter Anvin, (Wed Dec 12, 5:12 pm)
RE: More info on port 80 symptoms on MCP51 machine., Allen Martin, (Sat Dec 15, 6:34 pm)
Re: More info on port 80 symptoms on MCP51 machine., H. Peter Anvin, (Sat Dec 15, 6:46 pm)
Re: More info on port 80 symptoms on MCP51 machine., David P. Reed, (Wed Dec 12, 4:37 pm)
Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern A..., Alan Cox, (Tue Dec 11, 1:32 pm)
Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern A..., linux-os (Dick Johnson), (Tue Dec 11, 4:27 pm)
Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern A..., linux-os (Dick Johnson), (Wed Dec 12, 9:11 am)
Attitude problems., David P. Reed, (Wed Dec 12, 3:42 pm)
Re: Attitude problems., linux-os (Dick Johnson), (Wed Dec 12, 4:31 pm)
Re: Attitude problems., linux-os (Dick Johnson), (Fri Dec 14, 12:01 pm)
Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern A..., Dr. David Alan Gilbert, (Sun Dec 9, 9:41 am)
Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern A..., Lennart Sorensen, (Tue Dec 11, 11:14 am)
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