diff --git a/.travis.yml b/.travis.yml
index 36ef6ac7d..58686b89c 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -65,3 +65,6 @@ jobs:
         - source ./source.sh
         - travis_wait 120 make
         - travis_wait 10 ./scripts/travis.sh
+      after_failure:
+        - cat screenlog.0
+        - cat output.log
\ No newline at end of file
diff --git a/linux-keystone-driver b/linux-keystone-driver
index 4f8e0ea15..9c6b89010 160000
--- a/linux-keystone-driver
+++ b/linux-keystone-driver
@@ -1 +1 @@
-Subproject commit 4f8e0ea159b8e76a33c53b72b2921d592bb93076
+Subproject commit 9c6b89010f4a6e60d097d0f606f55fce816c44d8
diff --git a/patches/linux-cma.patch b/patches/linux-cma.patch
new file mode 100644
index 000000000..7c8a5328f
--- /dev/null
+++ b/patches/linux-cma.patch
@@ -0,0 +1,76 @@
+diff --git arch/riscv/mm/dma.c arch/riscv/mm/dma.c
+index 0689bb2..9fa9f11 100644
+--- arch/riscv/mm/dma.c
++++ arch/riscv/mm/dma.c
+@@ -20,6 +20,7 @@
+ #include <linux/gfp.h>
+ #include <linux/mm.h>
+ #include <linux/dma-mapping.h>
++#include <linux/dma-contiguous.h>
+ #include <linux/scatterlist.h>
+ #include <linux/swiotlb.h>
+ 
+@@ -35,14 +36,41 @@ static void *dma_riscv_alloc(struct device *dev, size_t size,
+ 		gfp |= __GFP_DMA32;
+ 	}
+ 
+-	return swiotlb_alloc_coherent(dev, size, dma_handle, gfp);
++	if (dev_get_cma_area(dev) && gfpflags_allow_blocking(gfp)) {
++		void* addr;
++		struct page *page;
++		page = dma_alloc_from_contiguous(dev, size >> PAGE_SHIFT,
++				get_order(size), gfp);
++		if (!page)
++		{
++			pr_err("Unabled to allocated from contiguous memory\n");
++			return NULL;
++		}
++
++		*dma_handle = phys_to_dma(dev, page_to_phys(page));
++		addr = page_address(page);
++		memset(addr, 0, size);
++		return addr;
++	} else {
++		return swiotlb_alloc_coherent(dev, size, dma_handle, gfp);
++	}
+ }
+ 
+ static void dma_riscv_free(struct device *dev, size_t size,
+                           void *cpu_addr, dma_addr_t dma_addr,
+                           unsigned long attrs)
+ {
+-	return swiotlb_free_coherent(dev, size, cpu_addr, dma_addr);
++	bool freed;
++	phys_addr_t paddr = dma_to_phys(dev, dma_addr);
++
++	freed = dma_release_from_contiguous(dev, 
++			phys_to_page(paddr), 
++			size >> PAGE_SHIFT);
++ 	if(!freed) {
++		swiotlb_free_coherent(dev, size, cpu_addr, dma_addr);
++	}
++	
++	return;
+ }
+ 
+ static int dma_riscv_supported(struct device *dev, u64 mask)
+diff --git arch/riscv/mm/init.c arch/riscv/mm/init.c
+index c77df81..312c84d 100644
+--- arch/riscv/mm/init.c
++++ arch/riscv/mm/init.c
+@@ -18,6 +18,7 @@
+ #include <linux/memblock.h>
+ #include <linux/swap.h>
+ #include <linux/sizes.h>
++#include <linux/dma-contiguous.h>
+ 
+ #include <asm/tlbflush.h>
+ #include <asm/sections.h>
+@@ -44,6 +45,7 @@ void __init paging_init(void)
+ 	setup_zero_page();
+ 	local_flush_tlb_all();
+ 	zone_sizes_init();
++  dma_contiguous_reserve(memblock_end_of_DRAM());
+ }
+ 
+ void __init mem_init(void)
diff --git a/scripts/apply-patch.sh b/scripts/apply-patch.sh
index 7e8c3f192..529d396ef 100755
--- a/scripts/apply-patch.sh
+++ b/scripts/apply-patch.sh
@@ -1,3 +1,10 @@
 #!/usr/bin/env bash
 cd riscv-qemu
-patch -p0 --forward hw/riscv/boot.c < ../patches/qemu-kernel-reloc.patch || true
+patch --forward hw/riscv/boot.c < ../patches/qemu-kernel-reloc.patch || true
+cd ..
+
+# linux patch
+cd riscv-linux
+patch -p0 --forward <  ../patches/linux-cma.patch || true
+cd ..
+
diff --git a/scripts/travis.sh b/scripts/travis.sh
index 07aee8480..5175a4650 100755
--- a/scripts/travis.sh
+++ b/scripts/travis.sh
@@ -1,7 +1,7 @@
 #!/bin/bash
 
 # Launch QEMU test
-screen -dmS qemu ./scripts/run-qemu.sh
+screen -L -dmS qemu ./scripts/run-qemu.sh
 sleep 10
 ./scripts/test-qemu.sh
 
diff --git a/sdk b/sdk
index c7a0a6e7c..f73d3772c 160000
--- a/sdk
+++ b/sdk
@@ -1 +1 @@
-Subproject commit c7a0a6e7c1fb9f24c725acd1766244f80ee87487
+Subproject commit f73d3772cd2bbb48fa44434bbfc26ed4e9fe63cb
diff --git a/tests/test-qemu.expected.log b/tests/test-qemu.expected.log
index db11dd75e..151618c8f 100644
--- a/tests/test-qemu.expected.log
+++ b/tests/test-qemu.expected.log
@@ -20,7 +20,6 @@ Enclave said: 2nd hello world!
 Enclave said value: 13
 Enclave said value: 20
 testing attestation
-{"device_pubkey": "0faad4ff01178583baa588966f7c1ff32564dd17d7dc2b46cb50a84a69270b4c", "enclave": {"data": "6e6f6e6365", "datalen": 5, "hash": "d57055329653d90d51d1cccb27aebdddbb7fb57ec233bb0e6fa252442c890578dc870b470ff2ef8b566bb2d8e426686635c5e887962e90b07e5ecfd1ce544a96", "signature": "715eb432d5a135ff99db5ebf36c879a2256ac30c748da53f4686582be8bc7350734ecfd0d546052e954b6982033412bcc5ad1ac31c6b0880072c2cb34725bd0f"}, "security_monitor": {"hash": "eae0226b42eaf3614ecf3fb1e6d3ce8854788457cacd018d9ef04de7c8d0d62504c040dc6a86b02380e459936e0ea96a4c721a0bec60351977b697ca46e7b05e", "pubkey": "40efc082defde02e3559d79b4536b602c3def2bf20515c59f189551a5c3481be", "signature": "f2acf168316d121005fc8dd3278b9740a17426a39ce6a95272ec9797a8710aa14f2cf700443b7aeddfd17f441f74f20a2d33827a4b4a04f3b6fde9ad6aa38c05"}}
 Attestation report SIGNATURE is valid
 root@ucbvax:~# poweroff
 root@ucbvax:~# Connection to localhost closed by remote host.