| fis lock | ||
|---|---|---|
 | 235.3. Flash Image System (FIS) |  |
Name
fis lock — Lock flash area
Synopsis
fis lock {-f flash_address} {-l length}
Arguments
| Name | Type | Description | Default |
|---|---|---|---|
flash_address
| Number | Address of area to be locked. | |
length
| Number | Length of area to be locked. |
Description
This command is used to write-protect (lock) a portion of flash memory, to prevent accidental overwriting of images. In order to make any modifications to the flash, a matching fis unlock command must be issued. This command is optional and will only be provided on hardware which can support write-protection of the flash space.
![[Note]](pix/note.png) | Note |
|---|---|
Depending on the system, attempting to write to write-protected flash may generate errors or warnings, or be benignly quiet. |
Examples
Lock an area of the flash
RedBoot> fis lock -f 0xa0040000 -l 0x20000
... Lock from 0xa0040000-0xa0060000: .| |  | |
| fis delete |  | fis unlock |
| 2025-10-02 | eCosPro Non-Commercial Public License |