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Comments:
<0> You ever asked a stupid question?
<1> hey all
<1> i have an a20 gate related question
<1> anyone around who might have some pointers?
<2> Hey people!
<1> howdy
<2> How are ye, meeku ?
<3> yo zeii
<1> can't complain.. except for my a20 enable code
<1> :)
<1> i've tried every manner of way, it seems to work in bochs, but when i run it from a usb boot on my actual machine.. it fails
<1> use the port 92 method, the int 15 ax=2401 methd
<1> the kybd controller method with both modes including 0dfh command for hp vectro
<2> How about good old conventional i8042 method?
<2> :P
<1> vectra even
<2> What kinda Processor?
<2> and BIOS?
<1> It's an AMI bios
<1> laptop with Intel Centrino 1.8ghz
<2> Hhmm
<3> laptops are odd
<1> its odd, i even tried using a copy of the old code i wrote back in the days for my dos pmode extender
<2> Ive tested my code on Award BIOS, Phoenix BIOS but no AMI. PRocessors ranging from Pentium 3/4 to Athlon xp - athlon64
<2> Kbd controller one fails a bit.
<2> HEy meeku
<2> Are you delaying between IO Writes?
<2> That was a problem with mine
<1> yep i'm using a few jmp short $+2 's and the 8042 wait
<2> erm... jmp short wont do much
<1> you have an email addy in priv msg ? I can drop you a copy of this bugger and see if i'm just missing something really stupid
<2> itll depend on the hardware how long it waits
<2> try doing a write to port 0x80 for wait.
<2> Im unfamiliar with 8042 wait
<1> thats a good point..
<1> what i noticed is:
<1> in my boot loader i display the error msg with a <press any key to reboot>
<1> and if i holdi nenter on that msg
<1> after about 20-30 goes it eventually enables the a20
<1> it goes thru to the 2nd stage loader/pmode switch etc
<2> Thats really, really strange.
<2> I enable my A20 in PM
<2> because my Bootloader is 32bit, mostly.
<2> Anywho...
<2> try having a more reliable delay.
<2> SEe if that helps :)
<2> Fixed my problems.
<1> so just a write of 00 to port 80h
<2> yep.
<2> that should be enough
<2> :)
<1> let me give that a bash.. thanks! (it does seem to be a delay problem)
<2> :)
<2> Goodluck
<1> ive got like 5 different a20 enable methods in there now.. one of them should work
<1> haha
<2> :P yeah.
<2> I have two, seems to do me okay so far.
<2> but ive only tested on Award or Phoenix.
<2> since, thats the one I seem to run into all the itme
<2> one or ht eother
<2> lol
<2> Oh, I have issues with IBM BIOS
<2> But I havent investigated that for a very long time
<1> i can drop you the other methods i'm using which are appropriate for some other chipsets if you wanna try them out
<1> in combination with the improved delay it should nail most of them down
<2> :)
<2> Im just adding the delay myself to my own IO functions :P
<2> lol
<2> See, ive been refactoring of late.
<2> Makin gmy codebase much cleaner and more organized.
<1> always a good thing :)
<2> hehe yep.
<2> I just did mine by putting the IOWAIT code directly into the IO ***embly stubs.
<2> I had it as a macro, but... it was never called.
<2> :P
<2> movb %al, %cl/* Preserve byte retrieved */
<2> movb $0x00, %al
<2> movw $0x80, %dx
<2> outb %al, %dx
<2> movb %cl, %al/* Restore byte retrieved */
<1> mov ax, 2401h
<1> int 15h
<1> apparently that can enable a20 on a lot of machines (check for carry flag)
<1> in al, 0eeh
<1> sometimes that works too as a fast a20 enable
<1> in al, 92h; Set A20 Enable bit on PS/2 Controller Port A.
<1> test al, 2
<1> jnz short no92
<1> or al, 2
<1> out 92h, al
<1> then that one
<1> then the std. 8042 stuff
<2> I wasnt aware you could safeguard 0x92
<2> I read it was unpredictable.
<2> thanks for that :)
<1> apparently it is
<1> and there doesn't seem to be a sure-fire way to determine which of the methods is most likely to work
<1> but the problem with the 8042 stuff is in a lot of machines they don't use the 8042 controller chip any more
<1> so you have to enable via port 92
<2> YEah, or they have a crappy emulation of hte 8042 chip
<1> swines
<1> hehe
<2> MY laptop uses 0x92, while desktop is fine with oldschool 8402
<1> stupid a20 gate
<2> Ive found almost all Phoenix BIOS Machines use 0x92
<2> atleast, every machine at my uni does.
<2> where as all AwardBIOS machines ive tested, (only about 12) use 8042 happily
<2> old 486 toshiba laptop, with Chips'n'bits BIOS seems to be completely unresponsive to all the ones ive tested.
<2> but then again, it dies trying to run Win3.1
<4> ChipsN****?
<2> yep
<2> nn, you nailed it :)
<4> mother****er.
<2> ?
<4> Someone rebooted the router i was working on
<2> pricks
<4> sonsobeeches
<4> Now i gotta drive to long island
<2> ;) SONUVABITCH!
<2> lol
<2> Well, have fun :P
<2> lol
<2> MY router is just below my feet :)
<2> My cat likes to hurt it
<4> I can sit on my edge-router :)
<4> it's a dual p3 500
<4> keeps my room cozy arm
<4> warm
<2> Nice :)
<2> My router is a little box
<4> Old dell poweredge
<2> with 12 ports.
<2> I love my little router.
<2> best buy ever.
<2> lol
<4> got a few NICs in it, one for the AP, one for the cable modem, one for the FiOS, and one for the wired network (gigabit)
<2> nice!
<4> got it free
<4> just had to lug it home on the subway
<2> pain
<4> 85 pounds of dell lovin
<2> lol
<2> heavy machine
<2> My machine is just a cage.
<2> :)
<2> with hardware hanging from it
<2> :)
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