In addition to this, I think adding a "hantro_config.h" header would be useful. That's because we can find this in the Makefile_codec file:

  CFLAGS += -DSET_OUTPUT_CROP_RECT -DUSE_EXTERNAL_BUFFER -DUSE_OUTPUT_RELEASE -DVSI_API -DIS_G1_DECODER -DENABLE_CODEC_VP8 -DVP8_HWTIMEOUT_WORKAROUND -DENABLE_CODEC_MJPEG -DGET_FREE_BUFFER_NON_BLOCK -DDOWN_SCALER

and you need to set these flags in your code as well, otherwise you get stack corruption. For example, SET_OUTPUT_CROP_RECT enables certain fields in openmax_il/source/decoder/codec.h :

    typedef struct STREAM_INFO
    {
        OMX_COLOR_FORMATTYPE format;    // stream color format
        OMX_U32 framesize;              // framesize in bytes
        OMX_U32 width;                  // picture display width
        OMX_U32 height;                 // picture display height
        OMX_U32 sliceheight;            // picture slice height
        OMX_U32 stride;                 // picture scan line width
        OMX_BOOL interlaced;            // sequence is interlaced
        OMX_U32 imageSize;              // size of image in memory
        OMX_BOOL isVc1Stream;           // sequence is VC1 stream
#ifdef SET_OUTPUT_CROP_RECT
        OMX_BOOL crop_available;        // crop information
        OMX_U32 crop_width;
        OMX_U32 crop_height;
        OMX_U32 crop_left;
        OMX_U32 crop_top;
#endif
        OMX_U32 frame_buffers;
        OMX_U32 bit_depth;
        OMX_BOOL hdr10_available;
        METADATA_HDR10 hdr10_metadata;   // HDR10 metadata
        OMX_U32 video_full_range_flag;   // black level and range of luma chroma signals         OMX_BOOL colour_desc_available;  // indicate colour_primaries/transfer_characteristics/matrix_coeffs present or not         OMX_U32 colour_primaries;        // chromaticity coordinates of the source primaries         OMX_U32 transfer_characteristics;// opto-electronic transfer function         OMX_U32 matrix_coeffs;           // matrix coefficients used in deriving luma and chroma signals         OMX_BOOL chroma_loc_info_available; // indicate chroma_sample_loc_type_top_field or bottom field are present or not         OMX_U32 chroma_sample_loc_type_top_field; // specify the location of chroma samples         OMX_U32 chroma_sample_loc_type_bottom_field; // specify the location of chroma samples
    } STREAM_INFO;

As a result, imx-vpuwrap has to set these same cflags. If you don't know this already, it is easy to miss, and causes ABI breakage.


On 2018-10-03 12:24, Gary Bisson wrote:
The source code uses LINUX_VERSION_CODE at many places which constraints
the package to be built with a toolchain whose headers match the kernel.

This is a far from ideal solution, especially if one wants to use a
prebuilt toolchain (with unknown kernel header version).

So change the CFLAGS to consider the kernel build folder so that the
Linux version test actually matches the kernel built.

Signed-off-by: Gary Bisson <gary.bis...@boundarydevices.com>
---
  ...clusion-to-be-from-kernel-build-fold.patch | 44 +++++++++++++++++++
  .../imx-vpu-hantro/imx-vpu-hantro_1.8.0.bb    |  5 ++-
  2 files changed, 48 insertions(+), 1 deletion(-)
  create mode 100644 
recipes-bsp/imx-vpu-hantro/imx-vpu-hantro/0002-Fix-version.h-inclusion-to-be-from-kernel-build-fold.patch

diff --git 
a/recipes-bsp/imx-vpu-hantro/imx-vpu-hantro/0002-Fix-version.h-inclusion-to-be-from-kernel-build-fold.patch
 
b/recipes-bsp/imx-vpu-hantro/imx-vpu-hantro/0002-Fix-version.h-inclusion-to-be-from-kernel-build-fold.patch
new file mode 100644
index 00000000..e9bf9257
--- /dev/null
+++ 
b/recipes-bsp/imx-vpu-hantro/imx-vpu-hantro/0002-Fix-version.h-inclusion-to-be-from-kernel-build-fold.patch
@@ -0,0 +1,44 @@
+From 1d7b7046c8f735e150e92aeace3fe6d0686b9bc9 Mon Sep 17 00:00:00 2001
+From: Gary Bisson <gary.bis...@boundarydevices.com>
+Date: Wed, 3 Oct 2018 10:52:29 +0200
+Subject: [PATCH] Fix version.h inclusion to be from kernel build folder
+
+Instead of relying on Toolchain headers which can be from newer kernel.
+
+Signed-off-by: Gary Bisson <gary.bis...@boundarydevices.com>
+---
+ Makefile_G1G2 | 3 +++
+ Makefile_H1   | 3 +++
+ 2 files changed, 6 insertions(+)
+
+diff --git a/Makefile_G1G2 b/Makefile_G1G2
+index 29866a4..c473bcb 100755
+--- a/Makefile_G1G2
++++ b/Makefile_G1G2
+@@ -16,6 +16,9 @@ INCLUDE_HEADERS += -I$(LINUX_KERNEL_ROOT)/include/uapi 
-I$(LINUX_KERNEL_ROOT)/in
+ # ION header location
+ INCLUDE_HEADERS += -I$(LINUX_KERNEL_ROOT)/drivers/staging/android/uapi
+
++# LINUX_VERSION_CODE from kernel build folder instead of toolchain headers
++INCLUDE_HEADERS += -I$(LINUX_KERNEL_BUILD)/include/generated/uapi
++
+ CFLAGS += -DDEC_MODULE_PATH=\"/dev/mxc_hantro\" -DUSE_FAKE_RFC_TABLE 
-DFIFO_DATATYPE=void* -DNDEBUG -DDOWN_SCALER \
+            -DUSE_EXTERNAL_BUFFER -DUSE_FAST_EC -DUSE_VP9_EC 
-DGET_FREE_BUFFER_NON_BLOCK \
+            -DDEC_X170_OUTPUT_FORMAT=0 -DDEC_X170_TIMEOUT_LENGTH=-1 
-DENABLE_HEVC_SUPPORT \
+diff --git a/Makefile_H1 b/Makefile_H1
+index 56b4332..0be43ce 100755
+--- a/Makefile_H1
++++ b/Makefile_H1
+@@ -23,6 +23,9 @@ ENV += -I$(SDKTARGETSYSROOT)/usr/imx/include
+ # ION header location
+ ENV += -I$(LINUX_KERNEL_ROOT)/drivers/staging/android/uapi
+
++# LINUX_VERSION_CODE from kernel build folder instead of toolchain headers
++INCLUDE_HEADERS += -I$(LINUX_KERNEL_BUILD)/include/generated/uapi
++
+ LIBENCNAME = libcodec_enc
+ LIBSENC = -L./ -lhantro_h1 -lpthread
+
+--
+2.19.0
+
diff --git a/recipes-bsp/imx-vpu-hantro/imx-vpu-hantro_1.8.0.bb 
b/recipes-bsp/imx-vpu-hantro/imx-vpu-hantro_1.8.0.bb
index 243f1f35..b5fc8468 100644
--- a/recipes-bsp/imx-vpu-hantro/imx-vpu-hantro_1.8.0.bb
+++ b/recipes-bsp/imx-vpu-hantro/imx-vpu-hantro_1.8.0.bb
@@ -12,6 +12,7 @@ PROVIDES = "virtual/imxvpu"
  SRC_URI = " \
      ${FSL_MIRROR}/${PN}-${PV}.bin;fsl-eula=true \
      file://0001-Fix-ion.h-header-inclusion-to-be-standard.patch \
+    file://0002-Fix-version.h-inclusion-to-be-from-kernel-build-fold.patch \
  "
  SRC_URI[md5sum] = "140796ddd6f1be47cffb7e5e2bfe0fb6"
  SRC_URI[sha256sum] = 
"c092a5b0f8897bae54154f58e47b6d2de033da01ee231a8cd779a51bbe962606"
@@ -24,7 +25,9 @@ PLATFORM_mx8mm = "IMX8MM"
  PLATFORM_mx8mq = "IMX8MQ"
do_compile () {
-    oe_runmake CROSS_COMPILE="${HOST_PREFIX}" LINUX_KERNEL_ROOT="${STAGING_KERNEL_DIR}" 
SDKTARGETSYSROOT="${STAGING_DIR_TARGET}" PLATFORM="${PLATFORM}" all
+    oe_runmake CROSS_COMPILE="${HOST_PREFIX}" 
LINUX_KERNEL_BUILD="${STAGING_KERNEL_BUILDDIR}" \
+        LINUX_KERNEL_ROOT="${STAGING_KERNEL_DIR}" 
SDKTARGETSYSROOT="${STAGING_DIR_TARGET}" \
+        PLATFORM="${PLATFORM}" all
  }
do_install () {

--
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