Comment 6 for bug 1370352

Both "yes" and "early" work fine.
However when I set IUCODE_TOOL_INITRAMFS=no, update the initramfs, reboot and then reinstall intel-microcode I get the same trap invalid opcode.

I guess no processes that use libpthread run during early boot when the microcode update is applied.

early:
[ 0.000000] CPU0 microcode updated early to revision 0x1c, date = 2014-07-03
[ 0.083506] CPU1 microcode updated early to revision 0x1c, date = 2014-07-03
[ 0.097821] CPU2 microcode updated early to revision 0x1c, date = 2014-07-03
[ 0.112006] CPU3 microcode updated early to revision 0x1c, date = 2014-07-03
[ 0.547442] microcode: CPU0 sig=0x306c3, pf=0x2, revision=0x1c
[ 0.547513] microcode: CPU1 sig=0x306c3, pf=0x2, revision=0x1c
[ 0.547587] microcode: CPU2 sig=0x306c3, pf=0x2, revision=0x1c
[ 0.547661] microcode: CPU3 sig=0x306c3, pf=0x2, revision=0x1c

yes:
[ 0.557422] microcode: CPU0 sig=0x306c3, pf=0x2, revision=0x16
[ 0.557496] microcode: CPU1 sig=0x306c3, pf=0x2, revision=0x16
[ 0.557569] microcode: CPU2 sig=0x306c3, pf=0x2, revision=0x16
[ 0.557643] microcode: CPU3 sig=0x306c3, pf=0x2, revision=0x16
[ 2.725811] microcode: CPU0 sig=0x306c3, pf=0x2, revision=0x16
[ 2.727303] microcode: CPU0 updated to revision 0x1c, date = 2014-07-03
[ 2.727352] microcode: CPU1 sig=0x306c3, pf=0x2, revision=0x16
[ 2.728156] microcode: CPU1 updated to revision 0x1c, date = 2014-07-03
[ 2.728182] microcode: CPU2 sig=0x306c3, pf=0x2, revision=0x16
[ 2.728954] microcode: CPU2 updated to revision 0x1c, date = 2014-07-03
[ 2.728996] microcode: CPU3 sig=0x306c3, pf=0x2, revision=0x16
[ 2.729867] microcode: CPU3 updated to revision 0x1c, date = 2014-07-03