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Date: Fri, 04 May 2001 22:02:27 +0900
From: SHIMURA Tatsuya <shimura@math.cst.nihon-u.ac.jp>
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Subject: [FreeBSD-users-jp 61180] PIO =?ISO-2022-JP?B?GyRCJEc1LxsoQg==?=
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$BEl<G$N(B Dynabook satellite 2510 $B$H$$$&(B note PC $B$K(B FreeBSD 4.2-RELEASE $B$r(B
$B%$%s%9%H!<%k$7$F;H$C$F$$$^$9!#(B

$B$3$l$^$GA4A35$$E$+$J$+$C$?$N$G$9$,!"5/F08e$7$P$i$/$9$k$H(B($B%?%$%_%s%0$O0l(B
$BDj$7$F$$$J$$$N$G$9$,(B)$B<!$N%a%C%;!<%8$,8=$l$^$9!#(B

/kernel: ad0: READ command timeout tag=0 serv=0 - resetting
/kernel: ata0: resetting devices .. done
/kernel: ad0: READ command timeout tag=0 serv=0 - resetting
/kernel: ata0: resetting devices .. done
/kernel: ad0: READ command timeout tag=0 serv=0 - resetting
/kernel: ata0: resetting devices .. done
/kernel: ad0: READ command timeout tag=0 serv=0 - resetting
/kernel: ad0: trying fallback to PIO mode
/kernel: ata0: resetting devices .. done

$B$3$N$^$^(B PIO mode $B$K$J$C$F$7$^$($P!"JL$KIT<+M3$9$k$3$H$J$/MxMQ$G$-$F$$$^$9(B
$B$,!">l9g$K$h$C$F$O(B PIO mode $B$K$J$i$:$K!"(Bdevice dissappeared! $B$H$$$&$h$&$J(B
$B%a%C%;!<%8(B ($B$9$_$^$;$s@53N$K3P$($F$$$^$;$s(B)$B$rI=<($7!"$=$N$^$^%O%s%0%"%C%W(B
$B$7$F$7$^$$$^$9!#(B

$B0l:rF|!"F1$85!<o$NJL$N%^%7%s$K(B 4.3-RELEASE $B$r%$%s%9%H!<%k$7$?$H$3$m!"F1$8(B
$B%a%C%;!<%8$,8=$l$?$N$G!"%O!<%I%&%'%"$NITNI$H$$$&LdBj$G$O$J$$$H;W$$$^$9!#(B

$B0JA0$K!"%O%s%0%"%C%W$r$7$F$7$^$C$?$N$G(B ($B;~4V$rCV$$$F$+$i(B) $B%j%;%C%H$7$?$H(B
$B$3$m(B /etc $B$N2<$N%U%!%$%k$,BgNL$K$J$/$J$C$F$7$^$C$?$3$H$,$"$j$^$7$?!#(B
$B$=$N$H$-$O!"F|:"$+$iMpK=$J07$$$r$7$F$$$?$3$H$HI|5l$K$*$*$o$i$o$@$C$?$3$H(B
$B$b$"$j$m$/$KD4$Y$J$+$C$?$N$G$9$,!"%O%s%0%"%C%W$N860x$O$3$l$G$O$O$J$+$C$?(B
$B$+$H;W$$$^$9!#(B


$B$=$3$G!"$H$j$"$($:5/F0;~$+$i(B PIO mode $B$K$7$FMxMQ$7$h$&$H;W$$$^$9!#(B
man ata(4) $B$r$7$F$_$?$H$3$m!"(B

     The following tunables are setable from the loader:

     hw.ata.ata_dma
     set to 1 for DMA access 0 for PIO (default is DMA).

$B$H$"$j!"$3$l$H(B man loader(8), man loader.conf(5) $B$d(B /boot/default/loader.conf 
$B$r8+$?8B$j$G$O!"(B/boot/loader.conf $B$K(B

hw.ata.ata_dma="0"

$B$N9T$rDI2C$9$l$P!">o$K(B PIO $B$G5/F0$5$;$k$3$H$,$G$-$k$H;W$&$N$G$9$,!"$3$l$G@5(B
$B$7$$$G$7$g$&$+!#(B


-- 
$BF|K\Bg3XM}9)3XIt?t3X2J(B
	$B;VB<(B $BN)Lp(B


