--- zzzz-none-000/linux-4.9.231/arch/mips/kernel/vpe-mt.c	2020-07-22 07:10:54.000000000 +0000
+++ falcon-5590-729/linux-4.9.231/arch/mips/kernel/vpe-mt.c	2022-03-30 12:03:33.000000000 +0000
@@ -87,6 +87,8 @@
 	 */
 	val = read_tc_c0_tcstatus();
 	val = (val & ~(TCSTATUS_DA | TCSTATUS_IXMT)) | TCSTATUS_A;
+	// allow DSP instructions
+	val = val | TCSTATUS_TMX;
 	write_tc_c0_tcstatus(val);
 
 	write_tc_c0_tchalt(read_tc_c0_tchalt() & ~TCHALT_H);