How to Boot from NVMe SSD?

Autonomous Machines Jetson & Embedded Systems Jetson AGX Xavier
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28

Hello,
I’ve found how to mount SSD as rootfs with extlinux.conf APPEND, but in still requires initrd modification (modification of this method).

Main problem: initrd created by JetPack 4.4 has init script, that search for root device first as device name format, then as PARTUUID format. Then only “PARTUUID*”, “mmcblk*”, “sd*”, “nfs” are acepted as legal rootdev string.
init[62…173]:

rootdev=“$(sed -ne 's/.\broot=/dev/([abcdefklmnps0-9])\b./\1/p’ < /proc/cmdline)"
if [ “${rootdev}” == “” ]; then
uuid_regex=‘[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}’
rootdev="$(sed -ne "s/.\broot=(PARTUUID=${uuid_regex})\b.*/\1/p” < /proc/cmdline)"
fi

if [ “${rootdev}” != “” ]; then
echo “Root device found: ${rootdev}” > /dev/kmsg;
fi
if [[ “${rootdev}” == PARTUUID* ]]; then
-------
elif [[ “${rootdev}” == mmcblk* ]]; then
-------
elif [[ “${rootdev}” == sd* ]]; then
-------
elif [[ “${rootdev}” == “nfs” ]]; then
-------
else
echo “No root-device: Mount failed” > /dev/kmsg;
exec /bin/bash;
fi