[LG Optimus 2x] 75markus:
i don´t know, but these partitions are used (this is from froyo stock rom, don´t know if there are changes in gb...)

[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=absolute
filesystem_type=basic
start_location=4194304
size=4096
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=1572864
file_system_attribute=0
partition_attribute=0
allocation_attribute=8
percent_reserved=0
filename=fastboot.bin

[partition]
name=MBR
id=5
type=master_boot_record
allocation_policy=sequential
filesystem_type=basic
size=1048576
file_system_attribute=0
partition_attribute=0
allocation_attribute=8
percent_reserved=0

[partition]
name=APP
id=6
type=data
allocation_policy=sequential
filesystem_type=basic
size=367001600
file_system_attribute=0
partition_attribute=0
allocation_attribute=8
percent_reserved=0
filename=system.img

[partition]
name=CAC
id=7
type=data
allocation_policy=sequential
filesystem_type=ext3
size=67108864
file_system_attribute=0
partition_attribute=0
allocation_attribute=8
percent_reserved=0

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

# extended partition
[partition]
name=EB1
id=9
type=extended_boot_record
allocation_policy=sequential
filesystem_type=basic
size=131072
file_system_attribute=0
partition_attribute=0
allocation_attribute=8
percent_reserved=0

[partition]
name=LNX
id=10
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=EB2
id=11
type=extended_boot_record
allocation_policy=sequential
filesystem_type=basic
size=131072
file_system_attribute=0
partition_attribute=0
allocation_attribute=8
percent_reserved=0

[partition]
name=DRM
id=12
type=data
allocation_policy=sequential
filesystem_type=ext3
size=2306560
file_system_attribute=0
partition_attribute=0
allocation_attribute=8
percent_reserved=0

[partition]
name=EB3
id=13
type=extended_boot_record
allocation_policy=sequential
filesystem_type=basic
size=131072
file_system_attribute=0
partition_attribute=0
allocation_attribute=8
percent_reserved=0

[partition]
name=SOS
id=14
type=data
allocation_policy=sequential
filesystem_type=basic
size=20971520
file_system_attribute=0
partition_attribute=0
allocation_attribute=8
percent_reserved=0
filename=recovery.img

[partition]
name=EB4
id=15
type=extended_boot_record
allocation_policy=sequential
filesystem_type=basic
size=131072
file_system_attribute=0
partition_attribute=0
allocation_attribute=8
percent_reserved=0

[partition]
name=UDA
id=16
type=data
allocation_policy=sequential
filesystem_type=ext3
size=1610612736
file_system_attribute=0
partition_attribute=0
allocation_attribute=8
percent_reserved=0

[partition]
name=EB5
id=17
type=extended_boot_record
allocation_policy=sequential
filesystem_type=basic
size=131072
file_system_attribute=0
partition_attribute=0
allocation_attribute=8
percent_reserved=0

[partition]
name=UDB
id=18
type=data
allocation_policy=sequential
filesystem_type=ext3
size=0xFFFFFFFFFFFFFFFF
file_system_attribute=0
partition_attribute=0
allocation_attribute=8
percent_reserved=0