st driver doesn't seem to grok LTO partitioning

I'm trying to use mt to work with LTO-5 and bigger tapes. Switching
partitions works:

# tapeinfo -f /dev/sg1
Product Type: Tape Drive
Vendor ID: 'HP      '
Product ID: 'Ultrium 5-SCSI  '
Revision: 'Z61U'
Attached Changer API: No
SerialNumber: 'HU1249TP88'
MinBlock: 1
MaxBlock: 16777215
SCSI ID: 1
SCSI LUN: 0
Ready: yes
BufferedMode: yes
Medium Type: Not Loaded
Density Code: 0x58
BlockSize: 0
DataCompEnabled: yes
DataCompCapable: yes
DataDeCompEnabled: yes
CompType: 0x1
DeCompType: 0x1
BOP: yes
Block Position: 0
Partition 0 Remaining Kbytes: 1459056
Partition 0 Size in Kbytes: 1459056
ActivePartition: 0
EarlyWarningSize: 0
NumPartitions: 1
MaxPartitions: 1
Partition0: 38
Partition1: 1453

# mt -f /dev/nst0 setpartition 1


However "mt mkpartition" fails miserably:

# mt -f /dev/nst0 mkpartition 1453
/dev/nst0: Input/output error

# dmesg | tail
st 6:0:1:0: st0: Failed to read 65536 byte block with 256 byte transfer.
st0: Sense Key : Illegal Request [current] 
st0: Add. Sense: Invalid field in parameter list

Is this a limitation of mt or the st driver?

-- 
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Emmanuel Florac     |   Direction technique
                    |   Intellique
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