When I add some extensions to onboot list, I get some error messages during booting and, to be more accurate, after "Loading extensions...".
If I add alsa-modules-4.2.9-tinycore extension to onboot list:
snd_ali5451 AC'97 1 access is not valid [0xffffffff], removing mixer
snd_ali5451 0000:00:06:0: ali mixer 1 creating error
If I add libreoffice extension to onboot list, I get the same messages and some more, like:
ali1535_smbus
ali15x3_smbus
upgrade bios or use force_addr=0xaddr
When I remove both of them from the list, there is no error message.