doing crazy things with proxmox - today: try ressource constrained device :)

[soli]

Hi, could someone please share the bios with uefi? Unfortunately I have an old version. Thanks

 

[krasjer]

Would it be possible to get the procedure as well. I already got to the virtualization done on multiple M340C using the H2ouve procedure.
BUT this Fifth one is running a really old BIOS and seems to recognize my 8GB SODIMM as 4GB...
I am guessing this is just old BIOS version related. So I need to download a newer BIOS....

Hi, I can't seem to find any sensible explanation as to what changes I need to apply to get the H2OUVE method done, do you maybe have a short explanation or guide? Thanks in advance.

 

[Equinizer]

For information about a somewhat different procedure to "fix" the Bios look here :
https://web.archive.org/web/20230226162054/http://www.dbse.de/app.js/document?doc=igel_M340C_bios

Denis uses efivar for this:

Warning​

At your own risk! No waranty! You may brick your device! Animals can be harmed!

Patching the BIOS settings with linux​

1. Install efivar and some kind of a hexeditor (recommended: hexedit). On Arch-Linux I installed:
   pacman -S efivar hexedit
   
   It should be possible to use the Arch-Linux install media without the need to install Arch-Linux.
   With grmli64-full 2021.07 (live media) you need internet access do this:
   apt update
   apt install efivar
   
   
2. Boot system in UEFI-Mode to get access to UEFI vars (location: /sys/firmware/efi/efivars)
3. Change to efivars virtual filesystem (should be mounted, if booted in UEFI mode)
   cd /sys/firmware/efi/efivars
   
   
4. The complete BIOS-setup is stored in this blob/var Setup-a04a27f4-df00-4d42-b552-39511302113d, dump it
   cat Setup-a04a27f4-df00-4d42-b552-39511302113d > /tmp/setup_dumped.bin
   
   
5. Watch out: the first 4 bytes dumped by this method are containing the UUID for the var. Remove this with dd:
   dd if=/tmp/setup_dumped.bin of=~/setup.bin bs=1 skip=4
   
   The size of the file should now 631 bytes, please check!
6. Now the plain blob with settings are in ~/setup.bin make a copy..
   cp ~/setup.bin ~/setup_mod.bin
   
   
7. Modify the blob with tools like hexedit (press CTRL-X to exit, confirm to save the changes)
   hexedit ~/setup_mod.bin
   
   These values were changed:
   • on address 00e0 from 00 into 01
   • on address 0149 from 01 into 00
   • This is a diff between the files:
   --- /mnt/igel/efivar_setup.txt 2022-06-02 12:25:04.000000000 +0000
   +++ /mnt/igel/efivar_setup_mod.txt 2022-06-02 12:25:56.000000000 +0000
   @@ -19,13 +19,13 @@
   000000b0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
   000000c0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
   000000d0 00 00 00 00 00 00 00 00 00 00 00 00 01 00 00 01 |................|
   -000000e0 00 00 00 00 00 00 00 00 00 00 00 01 01 00 00 00 |................|
   +000000e0 00 00 00 00 00 00 00 00 00 00 00 01 01 00 01 00 |................|
   000000f0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 01 00 |................|
   00000100 00 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
   00000110 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
   00000120 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
   00000130 00 00 00 00 00 00 00 00 00 00 01 00 00 00 01 01 |................|
   -00000140 01 01 01 00 00 00 00 00 00 01 00 02 03 02 00 02 |................|
   +00000140 01 01 01 00 00 00 00 00 00 00 00 02 03 02 00 02 |................|
   00000150 00 02 03 00 00 00 01 00 00 00 04 01 00 00 04 01 |................|
   00000160 00 00 04 00 00 00 04 00 00 00 00 00 00 00 00 00 |................|
   00000170 00 00 00 00 00 00 00 00 00 00 01 00 00 00 00 80 |................|
   
   After modifications in hexedit:
   
   
8. Make the efivar writable
   chattr -i Setup-a04a27f4-df00-4d42-b552-39511302113d
   
   
9. write the modified blob to the efivar with the efivar tool, remind the slighly changed name of the variable due to efivars requirements
   efivar -w -n a04a27f4-df00-4d42-b552-39511302113d-Setup -f ~/setup_mod.bin
   
   
10. Verify the last step, only two values should be altered
    efivar -n a04a27f4-df00-4d42-b552-39511302113d-Setup
    
    If you messed up things here, you can write your unmodified setup.bin with the efivar-cmd:
    efivar -w -n a04a27f4-df00-4d42-b552-39511302113d-Setup -f ~/setup.bin