Collecting entropy from device_attach() times.

[Dag-Erling Smørgrav]

I now have two EPIAs, a laptop and a VirtualBox VM gathering data using
this patch:

  http://people.freebsd.org/~des/software/attachtimes.diff

If you want to join in, here's how to prepare a USB stick:

  fetch http://people.freebsd.org/~des/software/attachtimes.tgz
  dd if=/dev/zero of=/dev/da0 bs=1m count=1
  gpart create -s gpt da0
  gpart bootcode -b /boot/pmbr da0
  gpart add -b 34 -s 94 -t freebsd-boot da0
  gpart bootcode -p /boot/gptboot -i 1 da0
  gpart add -t freebsd-ufs da0
  newfs -Uj /dev/da0p2
  mount -t ufs /dev/da0p2 /mnt
  tar zxf attachtimes.tgz -C /mnt
  sed -i.orig -e 's/ada0/da0/' /mnt/etc/fstab
  umount /mnt

or a VirtualBox disk image:

  fetch http://people.freebsd.org/~des/software/attachtimes.tgz
  rm -f attachtimes.img
  truncate -s 4G attachtimes.img
  mdconfig attachtimes.img
  gpart create -s gpt md0
  gpart bootcode -b /boot/pmbr md0
  gpart add -b 34 -s 94 -t freebsd-boot md0
  gpart bootcode -p /boot/gptboot -i 1 md0
  gpart add -t freebsd-ufs md0
  newfs -Uj /dev/md0p2
  mount -t ufs /dev/md0p2 /mnt
  tar zxf attachtimes.tgz -C /mnt
  vi /mnt/boot/loader.conf
  # remove the ata hint
  umount /mnt
  mdconfig -d -u 0
  VBoxManage convertfromraw attachtimes.img attachtimes.vdi

The kernel and binaries in the tarball are 32-bit.  The updated patch is
at http://people.freebsd.org/~des/software/attachtimes.diff.

DES
-- 
Dag-Erling Smørgrav - des at des.no