[Galaxy Tab 10.1 Q&A, Help & Troubleshooting] sgeos:
Good news- I finally managed to repartition my 32GB SCH-i905 with nvflash. This is the flash.cfg file I used. I also changed the EBT type to data.

[device]
type=hsmmc
instance=3

[partition]
name=BCT
id=2
type=boot_config_table
allocation_policy=sequential
filesystem_type=basic
size=3145728
file_system_attribute=0
partition_attribute=0
allocation_attribute=8
percent_reserved=0

[partition]
name=PT
id=3
type=partition_table
allocation_policy=sequential
filesystem_type=basic
size=524288
file_system_attribute=0
partition_attribute=0
allocation_attribute=8
percent_reserved=0

[partition]
name=EBT
id=4
type=bootloader
allocation_policy=sequential
filesystem_type=basic
size=2097152
file_system_attribute=0
partition_attribute=0
allocation_attribute=8
percent_reserved=0
filename=bootloader.bin

[partition]
name=EB2
id=5
type=data
allocation_policy=sequential
filesystem_type=basic
size=2097152
file_system_attribute=0
partition_attribute=0
allocation_attribute=8
percent_reserved=0

[partition]
name=GP1
id=6
type=data
allocation_policy=sequential
filesystem_type=basic
size=4194304
file_system_attribute=0
partition_attribute=0
allocation_attribute=8
percent_reserved=0
filename=boot.img

[partition]
name=EFS
id=7
type=data
allocation_policy=sequential
filesystem_type=basic
size=12582912
file_system_attribute=0
partition_attribute=0
allocation_attribute=8
percent_reserved=0

[partition]
name=SOS
id=8
type=data
allocation_policy=sequential
filesystem_type=basic
size=5242880
file_system_attribute=0
partition_attribute=0
allocation_attribute=8
percent_reserved=0
filename=recovery.img

[partition]
name=LNX
id=9
type=data
allocation_policy=sequential
filesystem_type=basic
size=8388608
file_system_attribute=0
partition_attribute=0
allocation_attribute=8
percent_reserved=0
filename=boot.img

[partition]
name=APP
id=10
type=data
allocation_policy=sequential
filesystem_type=ext3
size=606076928
file_system_attribute=0
partition_attribute=0
allocation_attribute=8
percent_reserved=0
filename=system.img

[partition]
name=CAC
id=11
type=data
allocation_policy=sequential
filesystem_type=ext3
size=469762048
file_system_attribute=0
partition_attribute=0
allocation_attribute=8
percent_reserved=0

[partition]
name=MSC
id=12
type=data
allocation_policy=sequential
filesystem_type=ext3
size=2097152
file_system_attribute=0
partition_attribute=0
allocation_attribute=8
percent_reserved=0

[partition]
name=MDM
id=13
type=data
allocation_policy=sequential
filesystem_type=basic
size=12582912
file_system_attribute=0
partition_attribute=0
allocation_attribute=8
percent_reserved=0

[partition]
name=UDA
id=14
type=data
allocation_policy=sequential
filesystem_type=basic
size=30426005504
file_system_attribute=0
partition_attribute=0
allocation_attribute=8
percent_reserved=0

[partition]
name=LTE
id=15
type=data
allocation_policy=sequential
filesystem_type=basic
size=25165824
file_system_attribute=0
partition_attribute=0
allocation_attribute=8
percent_reserved=0

[partition]
name=EF2
id=16
type=data
allocation_policy=sequential
filesystem_type=basic
size=6291456
file_system_attribute=0
partition_attribute=0
allocation_attribute=8
percent_reserved=0

[partition]
name=OTA
id=17
type=data
allocation_policy=sequential
filesystem_type=ext3
size=8388608
file_system_attribute=0
partition_attribute=0
allocation_attribute=0x808
percent_reserved=0

[partition]
name=HID
id=18
type=data
allocation_policy=sequential
filesystem_type=basic
size=314572800
file_system_attribute=0
partition_attribute=0
allocation_attribute=8
percent_reserved=0

[partition]
name=GPT
id=19
type=data
allocation_policy=sequential
filesystem_type=basic
size=1048576
file_system_attribute=0
partition_attribute=0
allocation_attribute=8
percent_reserved=0

Bad news- I can't get nvflash to load bootloader.bin anymore.

C:\nvflash>nvflash --bct part2.bct --bl bootloader.bin --go
Nvflash started
rcm version 0X20001
System Information:
chip name: t20
chip id: 0x20 major: 1 minor: 3
chip sku: 0x8
chip uid: 0x0288414343ff52d7
macrovision: disabled
hdcp: enabled
sbk burned: false
dk burned: false
boot device: emmc
operating mode: 3
device config strap: 0
device config fuse: 0
sdram config strap: 0

downloading bootloader -- load address: 0x108000 entry point: 0x108000
download command failed NvError 0x120002
command failure: bootloader download failed (bad data)
bootloader status: Bct file not found (code: 21) message: flags: 1073840124

C:\nvflash>

I had a soft bricked tab with nvflash/fastboot/Odin download, but it needed to be repartitioned. Now I have a repartitioned soft bricked tab with only nvflash, but bootloader.bin will not load. Maybe this is progress? Does anyone know how to fix bct?