Author: parsec
Subject: J3455-itx bios csm boot issue
Posted: 10 Nov 2016 at 11:35pm
Booting in UEFI mode requires the video source to be GOP compatible, which is the UEFI Graphics Output Protocol. That is a UEFI restriction that cannot be changed. It is simply impossible to boot a PC in UEFI mode when setting the CSM option, Launch Video OpROM Policy, to Legacy Only.
That is the reason CSM (Compatibility Support Module) exists, since older video cards do not support GOP. When CSM is enabled, the UEFI firmware is being run in emulated BIOS mode, and does not use any of the UEFI firmware features, except the GUI type interface to the UEFI options.
Intel's integrated graphics have supported GOP since the Sandy Bridge architecture, and your CPU's graphics should too. Do you have the Intel graphics driver installed?
If you have CSM set to Enabled, you will not be booting in UEFI mode.
If you did not install Windows in UEFI booting mode, you cannot simply change to UEFI booting mode after that.
Otherwise, the inability to enter the UEFI/BIOS in UEFI booting mode normally is caused by the Fast Boot option being set to Ultra Fast. The description of this option setting states it is impossible to enter the UEFI UI in the usual way. You must use the ASRock Restart to UEFI program, which uses a feature of Windows 8.1 and 10.
I'm assuming quite a bit here, since you did not provide any information about what OS you are using. Also, your description of your situation is not clear, such as did you install your OS in UEFI booting mode, and what exactly the situation is when you cannot enter the UEFI/BIOS. I'm guessing when you start or restart the PC, all you get is a black screen?
Subject: J3455-itx bios csm boot issue
Posted: 10 Nov 2016 at 11:35pm
| Image may be NSFW. Clik here to view.  matrix2020 wrote:I am trying to use csm boot in order to run a memtest. The problem is under csm module, it is impossible to enter bios after the graphics mode is selected to legacy only. That is after csm module is enabled, the only way to enter bios is to reset bios settings by clearing cmos. It should be possible to select both legacy and uefi video, or there needs to be another bios version which can boot under csm module. The problem occurs under the latest bios version which is 1.10 |
Booting in UEFI mode requires the video source to be GOP compatible, which is the UEFI Graphics Output Protocol. That is a UEFI restriction that cannot be changed. It is simply impossible to boot a PC in UEFI mode when setting the CSM option, Launch Video OpROM Policy, to Legacy Only.
That is the reason CSM (Compatibility Support Module) exists, since older video cards do not support GOP. When CSM is enabled, the UEFI firmware is being run in emulated BIOS mode, and does not use any of the UEFI firmware features, except the GUI type interface to the UEFI options.
Intel's integrated graphics have supported GOP since the Sandy Bridge architecture, and your CPU's graphics should too. Do you have the Intel graphics driver installed?
If you have CSM set to Enabled, you will not be booting in UEFI mode.
If you did not install Windows in UEFI booting mode, you cannot simply change to UEFI booting mode after that.
Otherwise, the inability to enter the UEFI/BIOS in UEFI booting mode normally is caused by the Fast Boot option being set to Ultra Fast. The description of this option setting states it is impossible to enter the UEFI UI in the usual way. You must use the ASRock Restart to UEFI program, which uses a feature of Windows 8.1 and 10.
I'm assuming quite a bit here, since you did not provide any information about what OS you are using. Also, your description of your situation is not clear, such as did you install your OS in UEFI booting mode, and what exactly the situation is when you cannot enter the UEFI/BIOS. I'm guessing when you start or restart the PC, all you get is a black screen?
