# Provision UFS device Provisioning refers to the process of creating and defining LUNs on a new UFS device. A UFS device has one or more logical units. A logical unit is an independent processing entity within the device. Each logical unit has an address within the UFS device called a Logical Unit Number (LUN). The configuration file for provisioning is at `

`bNumberLU` does not include well-known logical units | | `bBootEnable` | Indicates whether the device is enabled for boot:

00h: Boot feature disabled

01h: Bootable feature enabled

| | `bDescrAccessEn` | Indicates whether the Device Descriptor can be read after the partial initialization phase of the boot sequence:

00h: Device Descriptor access disabled

01h: Device Descriptor access enabled

| | `BInitPowerMode` | Defines the Power Mode after device initialization or hardware reset:

00h: UFS-Sleep Mode

01h: Active Mode

00h: Information removed by an erase of the physical memory

01h: Information removed by overwriting the addressed locations with a single character followed by an erase

02h: Information removed by overwriting the addressed locations with a character, its complement, then a random character

03h: Information removed using a vendor-defined mechanism

| | `bConfigDescrLock` |

0h: Configuration Descriptor not locked

1h: Configuration Descriptor locked

| Note - To reprovision the UFS device, set `bConfigDescrLock="0"`. This parameter is part of the provision XML file. - To prevent reprovisioning, set `bConfigDescrLock="1"` after the UFS device configuration and provisioning is finalized. UFS device LUN parameters description | Parameter | Description | | --- | --- | | `LUNum` | Logical Unit Number | | `bLUEnable` | Enables/disables the logical unit:

00h: Disables the logical unit

01h: Enables the logical unit

| | `bBootLunID` | Boot LUN ID:

00h: Not bootable

01h: Boot LU A

02h: Boot LU B

00h: LU is not write protected

01h: LU write protected when fPowerOnWPEn = 1

| | `bMemoryType` | Defines logical unit memory type:

00h: Normal memory

01h: System code memory type

02h: Non-Persistent memory type

03h: Enhanced memory type 1

04h: Enhanced memory type 2

05h: Enhanced memory type 3

06h: Enhanced memory type 4

| | `bProvisioningType` | Provisioning type

00h: Thin Provisioning is disabled

02h: Enables thin provisioning with TPRZ = 0

| ## UFS device partition layout The default UFS device provisioning creates eight LUNs (LUN0 to LUN7). - The Linux data and all Linux file system images are stored in LUN0. - Boot well-known LUN (WLUN) 0xB0 alternates between LUN1 and LUN2 to provide a fail-safe backup for the XBL. - The rest of the boot chain is stored in LUN4. - The LUN6 and LUN7 are unused by default. **Default UFS device layout** Last Published: Apr 21, 2026 [Previous Topic Configure SDHCI (eMMC and SD card internal) Linux kernel device tree](https://docs.qualcomm.com/bundle/publicresource/80-80022-6/topics/linux-device-tree.md) [Next Topic Customize storage features](https://docs.qualcomm.com/bundle/publicresource/80-80022-6/topics/customize.md)