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</o:shapelayout></xml><![endif]--></head><body lang=KO link="#0563C1" vlink="#954F72"><div class=WordSection1><p class=MsoNormal><span lang=EN-US>Hello,<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>In my ubuntu 20.04 machine, <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>ckim@ckim-ubuntu:~$ dmesg | grep 'Command'<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>[ 0.000000] Command line: BOOT_IMAGE=/boot/vmlinuz-5.11.0-36-generic root=UUID=5252b177-1243-4d3f-8a1a-ec7d0dcae011 ro quiet splash vt.handoff=7<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>ckim@ckim-ubuntu:~$ mount | grep boot<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>/dev/sda2 on /boot/efi type vfat (rw,relatime,fmask=0077,dmask=0077,codepage=437,iocharset=iso8859-1,shortname=mixed,errors=remount-ro)<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>The kernel image in /boot/ directory was used and the /boot directory is in /dev/sda2, a hard disk.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>I’m almost sure but is this possible because (my system used UEFI for booting, I can see /boot/efi/EFI/ directory)<o:p></o:p></span></p><ol style='margin-top:0cm' start=1 type=1><li class=MsoListParagraph style='margin-left:2.0pt;mso-para-margin-left:0gd;mso-list:l0 level1 lfo1'><span lang=EN-US>the UEFI firmware has file system driver and could open the disk partition and used the kernel image to boot<o:p></o:p></span></li><li class=MsoListParagraph style='margin-left:2.0pt;mso-para-margin-left:0gd;mso-list:l0 level1 lfo1'><span lang=EN-US>the UEFI firmware detected the disk (using SCSI driver?) and edited the system hardware information (here maybe ACPI table) and passed it to linux kernel.<o:p></o:p></span></li></ol><p class=MsoNormal><span lang=EN-US>Is my understanding correct?<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>Thanks in advance.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>Regards,<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>Chan Kim<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p></div></body></html>