Boot system rescue cd

[alh]

Perhaps should you try to force resolution on iVentoy side ?

The screen problem is definitely the hardware (old laptop). Tried all resolution values, most either fail or turns iVentoy's menu into unreadable garbage. Same happens with my own iPXE, so it isn't unique to iVentoy. I tested the same on a VM and the rescue CD's grub menu does display. 

For now, I put my own iPXE in front of iVentoy so my iPXE can boot system rescue (using the needed kernel parameters) or chain to iVentoy. 

I was also able to get it to boot from iVentoy by using my own ipxe script instead of the iventoy generated one, changing:

:MENU_FILE_<nn>
echo -n -s Preparing for boot, please wait...
sanboot -d 0xe0 -n ${HTTP_URL}/viso/id/<nn>/mac:${mac}/bus:${bustype}:${busid} ||
goto MENU_DIR_<n>

to

:MENU_FILE_<nn>
echo -n -s Preparing for boot, please wait...
imgfree
kernel ${HTTP_URL}/eiso/id/<nn>/sysresccd/boot/x86_64/vmlinuz archisobasedir=sysresccd ip=dhcp net.ifnames=0 archiso_http_srv=${HTTP_URL}/eiso/id/<nn>
initrd ${HTTP_URL}/eiso/id/<nn>/sysresccd/boot/x86_64/sysresccd.img
boot
goto MENU_DIR_<n>

Neither solution is perfect. Hopefully more OS ISO's will be supported soon in iVentoy.