Fix DMA #1114

Job	Run time
check-opcodes	6s
riscv-isa-sim	12s
tc-gcc	46m 38s
tc-llvm	2h 11m 2s
verilator	18s
verilator-model (minpool)	3m 1s
verilator-model (mempool)	20m 56s
check-bootrom	24s
build-apps-omp (minpool)	38s
unit-test	1m 51s
build-apps-omp (mempool)	47s
build-apps-gcc (minpool)	1m 3s
build-apps-gcc (mempool)	1m 8s
run-apps-gcc (minpool)	37s
run-apps-gcc (mempool)	2m 36s
tc-halide	16m 29s
build-apps-llvm (minpool)	1m 20s
build-apps-llvm (mempool)	1m 54s
run-apps-llvm (minpool)	27s
run-apps-llvm (mempool)	2m 47s
build-apps-halide (minpool)	1m 24s
build-apps-halide (mempool)	1m 11s
run-apps-halide (minpool)	26s
run-apps-halide (mempool)	4m 40s
clean-up-compile-runs (minpool)	4s
clean-up-compile-runs (mempool)	4s
clean-up	2s
	4h 2m 5s

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