LX51: Error L257: Extended Linker Requires Upgrade to PK51

Information in this article applies to:

I purchased a limited version of the Keil C51 development tools, and now I get the following error message when I build a project:

*** ERROR L257: EXTENDED LINKER REQUIRES UPGRADE TO PK51

The project loaded is configured for the LX51 Extended Linker.

You have the following options:

In µVision, you may disable Use Extended Linker (LX51) instead of BL51 under Project - Options for Target - Device. In this case you might need to adapt certain linker options in your project.
If you need the extra features the Extended Linker supports, you must purchase an upgrade to the PK51 Professional Developer's Kit.

Last Reviewed: Thursday, February 25, 2021

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