QuickLinks -- Click here to rapidly navigate through this document

EXHIBIT 23.1

Consent of Independent Registered Public Accounting Firm

        We hereby consent to the incorporation by reference in the Registration Statements on Form S-8 (Nos. 333-64302, 333-104071, 333-118992, 333-123364, 333-132492, 333-141264, 333-149756, 333-157964, 333-159753, 333-168358, 333-172828 and 333-180119) and Form S-3 (No. 333-170327) of MoSys, Inc. of our reports dated March 11, 2013 relating to the consolidated financial statements, financial statement schedule and the effectiveness of internal control over financial reporting , which appear in this Annual Report on Form 10-K.

/s/ Burr Pilger Mayer, Inc.

San Jose, California
March 11, 2013

QuickLinks

EXHIBIT 23.1

Consent of Independent Registered Public Accounting Firm