Need help to add Tsurugi linux

[esp13]

Hi,

I'm trying to add tsurugi linux https://tsurugi-linux.org/downloads.php to glim iso menu entry but I am stuck.
I am beginning with acquire live 2021.1
Tsurugi linux seems to be based on ubuntu (not sure about the acquire version) https://tsurugi-linux.org/documentation_tsurugi_linux_1.php
I have set this in inc-tsurugi.cfg:

# Tsurugi
function add_menu {
  isofile="$1"
  linuxparams="$2"

  regexp \
    --set 1:isoname \
    --set 2:variant \
    --set 3:version \
    "^${isopath}/(tsurugi_([^-]+)_([^-]+)\.iso)\$" "${isofile}"
  menuentry "Tsurugi ${variant} ${version} ${linuxparams}" "${isofile}" "${isoname}" --class tsurugi {
    set isofile=$2
    set isoname=$3
    use "${isoname}"
    loop $isofile
    linux (loop)/live/vmlinuz boot=live username=root quiet findiso=${isofile} toram=filesystem.squashfs
    initrd (loop)/live/initrd.img
  }
}

for_each_sorted add_menu "$isopath"/tsurugi_*.iso

It detect the iso, the variant, the version.
But when it launch, it get stuck and don't go further. Can you help me finish this?