on 05/11/2008 17:24 Andriy Gapon said the following: > System is FreeBSD 7.1-BETA2 amd64. > > Looking through my dmesg I see that relative order of ukbd attachment > and root mounting is not deterministic. Sometime keyboard is attached > first, sometimes root filesystem is mounted first. Quite more often root > is mounted first, though. > Example (with GENERIC kernel): > Nov 3 15:40:54 kernel: Trying to mount root from ufs:/dev/mirror/bootgm > Nov 3 15:40:54 kernel: GEOM_LABEL: Label ufs/bootfs removed. > Nov 3 15:40:54 kernel: GEOM_LABEL: Label for provider mirror/bootgm is > ufs/bootfs. > Nov 3 15:40:54 kernel: GEOM_LABEL: Label ufs/bootfs removed. > Nov 3 15:40:54 kernel: ukbd0: <CHESEN USB Keyboard, class 0/0, rev > 1.10/1.10, addr 3> on uhub2 > Nov 3 15:40:54 kernel: kbd2 at ukbd0 > Nov 3 15:40:54 kernel: uhid0: <CHESEN USB Keyboard, class 0/0, rev > 1.10/1.10, addr 3> on uhub2 > > Another (with custom kernel, zfs root): > Nov 4 17:54:03 odyssey kernel: Trying to mount root from zfs:tank/root > Nov 4 17:54:03 odyssey kernel: ukbd0: <CHESEN USB Keyboard, class 0/0, > rev 1.10/1.10, addr 3> on uhub2 > Nov 4 17:54:03 odyssey kernel: kbd2 at ukbd0 > Nov 4 17:54:03 odyssey kernel: kbd2: ukbd0, generic (0), config:0x0, > flags:0x3d0000 > Nov 4 17:54:03 odyssey kernel: uhid0: <CHESEN USB Keyboard, class 0/0, > rev 1.10/1.10, addr 3> on uhub2 > > I have a legacy-free system (no PS/2 ports, only USB) and I wanted to > try a kernel without atkbd and psm (with ums, ukbd, kbdmux), but was > bitten hard when I made a mistake and kernel could not find/mount root > filesystem. > > So I stuck at mountroot prompt without a keyboard to enter anything. > This was repeatable about 10 times after which I resorted to live cd. > > Since then I put back atkbdc into my kernel. I guess BIOS or USB > hardware emulate AT or PS/2 keyboard, so the USB keyboard works before > the driver attaches. I guess I need such emulation e.g. for loader or > boot0 configuration. But I guess I don't have to have atkbd driver in > kernel.
This turned out not to be a complete solution as it seems that there are some quirks about legacy USB here, sometimes keyboard stops working even at loader prompt (this is described in a different thread). ukbd attachment still puzzles me a lot. I look at some older dmesg, e.g. this 7.0-RELEASE one: http://www.mavetju.org/mail/view_message.php?list=freebsd-usb&id=2709973 and see that ukbd attaches along with ums before mountroot. I look at newer dmesg and I see that ums attaches at about the same time as before but ukbd consistently attaches after mountroot. I wonder what might cause such behavior and how to fix it. I definitely would like to see ukbd attach before mountroot, I can debug this issue, but need some hints on where to start. -- Andriy Gapon _______________________________________________ freebsd-stable@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-stable To unsubscribe, send any mail to "[EMAIL PROTECTED]"
