I have an OPNsense DEC740 that I'm trying to install PBS onto (the manufacturer doesn't support anything other than OPNsense).
This device uses a Ryzen V1500B embedded CPU and has no video output, only serial console via USB. The device shows up in Linux as
In the BIOS, I have these settings for the serial console.
If I boot PBS flashed to a USB drive with
However, if I flash Ventoy to the USB drive, I can copy the PBS ISO to Ventoy and boot to the Ventoy menu.
Booting in "normal mode" does nothing (literally a black screen)...
If I use "grub2 mode", I see these two options.
Choosing "Terminal UI" shows this, then nothing else happens...
The only option that does anything is going to Advanced and choosing "Serial Console Debug Mode".
That eventually boots Linux and gets me to the installer (I can't copy/paste terminal output here, so this is a screenshot). My question is, why does this work with Ventoy but not the PBS ISO?

From the docs, I see this. Is there a way to set this by editing the USB drive flashed directly with
This device uses a Ryzen V1500B embedded CPU and has no video output, only serial console via USB. The device shows up in Linux as
Bus 001 Device 019: ID 04e2:1411 Exar Corp. XR21B1411 UART
.In the BIOS, I have these settings for the serial console.
Code:
InsydeH2O Setup Utility Rev. 5.0
AMD CBS
/-------------------------------------------------------------------------------------+----------------------------------------\
|Uart Configuration Options |No help string |
| | |
|Uart 0 Enable <Enabled> | |
|Uart 0 Legacy Options <COM1 0x3F8> | |
|Uart Driver Type <AMD Serial Driver> | |
If I boot PBS flashed to a USB drive with
dd
, I only see this. I never get to the PBS boot screen.
Code:
error: file `/boot/' not found.
However, if I flash Ventoy to the USB drive, I can copy the PBS ISO to Ventoy and boot to the Ventoy menu.
Code:
GNU GRUB version 2.04
/----------------------------------------------------------------------------\
|*proxmox-backup-server_4.0-1.iso |
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| |
\----------------------------------------------------------------------------/
Use the ^ and v keys to select which entry is highlighted.
Ventoy 1.1.07 UEFI www.ventoy.net
L:Language F1:Help F2:Browse F3:TreeView F4:Localboot F5:Tools
F6:ExMenu
Booting in "normal mode" does nothing (literally a black screen)...
Code:
GNU GRUB version 2.04
/----------------------------------------------------------------------------\
|*Boot in normal mode |
| Boot in grub2 mode |
| File checksum |
| Return to previous menu |
| |
| |
| |
| |
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| |
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\----------------------------------------------------------------------------/
Use the ^ and v keys to select which entry is highlighted.
If I use "grub2 mode", I see these two options.
Code:
GNU GRUB version 2.04
/----------------------------------------------------------------------------\
|*Install Proxmox Backup Server (Graphical) |
| Install Proxmox Backup Server (Terminal UI) |
| Advanced Options |
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| |
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| |
| |
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| |
\----------------------------------------------------------------------------/
Use the ^ and v keys to select which entry is highlighted.
Choosing "Terminal UI" shows this, then nothing else happens...
Code:
Loading Proxmox Backup Server Console Installer ...
Loading initial ramdisk ...
The only option that does anything is going to Advanced and choosing "Serial Console Debug Mode".
Code:
GNU GRUB version 2.04
/----------------------------------------------------------------------------\
| Install Proxmox Backup Server (Debug Mode) |
| Install Proxmox Backup Server (Terminal UI, Debug Mode) |
|*Install Proxmox Backup Server (Serial Console Debug Mode) |
| Install Proxmox Backup Server (Automated) |
| Rescue Boot |
| Test memory (memtest86+) |
| UEFI Firmware Settings |
| |
| |
| |
| |
| |
| |
| |
| |
\----------------------------------------------------------------------------/
Use the ^ and v keys to select which entry is highlighted.
That eventually boots Linux and gets me to the installer (I can't copy/paste terminal output here, so this is a screenshot). My question is, why does this work with Ventoy but not the PBS ISO?

From the docs, I see this. Is there a way to set this by editing the USB drive flashed directly with
dd
? It seems dumb to have to use Ventoy to install PBS, when PBS should be able to do this. I can't set nomodeset
, because I never get to the Proxmox boot menu... Advanced Options: Install Proxmox Backup Server (Serial Console Debug Mode)
Same the terminal-based debug mode, but additionally sets up the Linux kernel touse the (first) serial port of the machine for in- and output.