Messages in this thread | | | Date | Sun, 14 Jun 1998 18:36:10 +0000 | From | Yaroslav Rosomakho <> | Subject | Re: Better patch for 2.1.106 |
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H. Peter Anvin wrote:
> Here is a "better" patch that I hope should fix the CRC problem with > zImages in 2.1.106 (personally, I think the "right" thing is to > deprecate zImages completely, but I'm not likely to get a whole bunch > of votes for this.) > > I don't like using the division overflow trap location, so I am using > the INT 0x80 vector instead (the same as is later used for Linux > system calls.) > > The problem with 2.1.106 is that zImages (but not bzImages) do a > strange re-relocation from 64K to 4K, and it is done *before* the test > (so 0x7c00 is actually in use at the time of the test.) > > -hpa > > --- stock/linux-2.1.106/arch/i386/boot/setup.S Sun Jun 14 13:59:09 1998 > +++ linux-2.1.106/arch/i386/boot/setup.S Sun Jun 14 13:49:47 1998 > @@ -532,22 +532,21 @@ > call empty_8042 > > ! wait until a20 really *is* enabled; it can take a fair amount of > -! time on any > - > - push ds > - push es > +! time on certain systems; Toshiba Tecras are known to have this > +! problem. The memory location used here (0x200) is the int 0x80 > +! vector, which should be safe to use. > + > xor ax,ax ! segment 0x0000 > - mov ds,ax > + mov fs,ax > dec ax ! segment 0xffff (HMA) > - mov es,ax > + mov gs,ax > a20_wait: > inc ax > - mov [0x7c00],ax ! any unused memory location ? 64K > - seg es > - cmp ax,[0x7c10] ! corresponding HMA address > + seg fs > + mov [0x200],ax ! an unused memory location ? 0xfff0 > + seg gs > + cmp ax,[0x210] ! corresponding HMA address > je a20_wait ! loop until no longer aliased > - pop es > - pop ds > > ! make sure any possible coprocessor is properly reset.. > > > -- > PGP: 2047/2A960705 BA 03 D3 2C 14 A8 A8 BD 1E DF FE 69 EE 35 BD 74 > See http://www.zytor.com/~hpa/ for web page and full PGP public key > I am BahА'М -- ask me about it or see http://www.bahai.org/ > "To love another person is to see the face of God." -- Les MisИrables > > - > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > the body of a message to majordomo@vger.rutgers.edu
I have mirrored patch at http://yaroslav.hypermart.net/linux. Yaroslav Rosomakho. P.S. H. Peter Avin, that mirror is ok?
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