While snooping around the stock init script, I spotted a variable, home, in the mountdata function standing out from the crowd. After doing some quick tests, the preliminary results are summarised as follows,
Prerequisite: The persistent overlay (.img, .aes or .inf) being on the same partition as the KNOPPIX file.
Functionality: Loading a specific persistent overlay at the boot time.
Usage: knoppix home=/mnt-system/foobar/dummy
*The dirname and basename cannot contain any whitespace characters.
*The basename needs to be unique if there are more than one overlay files in the same folder because the suffix cannot be part of the argument.
Grandstream GS-HT802 2 Port Analog Telephone Adapter VoIP Phone & Device, Black
$32.00
Cisco VG202XM Analog Voice Gateway VoIP -- [NEW/FULL KIT]
$76.00
Yealink T54W IP Phone, 16 VoIP Accounts. 4.3-Inch Color Display - Black
$99.99
LOT OF 10 Cisco CP-7841-K9 VoIP 4-Line Business Phone w/ Stand Handset Cord
$69.99
Yealink W73H IP DECT VOIP Phone
$10.00
New Cisco 7945G IP VoIP Gigabit GIGE Telephone Phone CP-7945G -
$24.95
Cisco CP-7945G VOIP Phone With Stand & Handset Business IP Phone 7945
$3.00
Cisco CP-8865 Video IP 720P Phone Business Telephone WiFi VoiP LCD CP 8865 Wired
$22.00
NEW Open Box Polycom CCX 400 VoIP Desk Phone PoE 2200-49700-001 (BR)
$107.96
Yealink SIP-T41P PoE Ultra Elegant VoIP Phone
$29.95