Update README.md

Describe the new build process, build dependencies, and usage.

Also remove some old known issues.

Change-Id: Iec85db378442e3e0ca091d551a42a40e6549ddb3


[ROCm/ROCR-Runtime commit: cd26cbbe5f]

projects/rocr-runtime/runtime/hsa-runtime/README.md

@@ -41,19 +41,56 @@ can be obtained from the ROCT-Thunk-Interface repository, available here:
 
 https://github.com/RadeonOpenCompute/ROCT-Thunk-Interface
  
-Specify the directory containing libhsakmt.so.1 and hsakmt.h using the cmake variables, HSAKMT_LIB_PATH and HSAKMT_INC_PATH.  These can be specified either on the command line
-or via standard cmake configuration tools such as ccmake or cmake-gui.
+As of ROCm release 3.7 libhsakmt development packages now include a cmake
+package config file.  The runtime will now locate libhsakmt via find_package if
+libhsakmt is installed to a standard location.  For installations that do not
+use ROCm standard paths set cmake variables CMAKE_PREFIX_PATH or hsakmt_DIR to
+override find_package search paths.
 
-For example, from the top level ROCR repository execute:
+As of ROCm release 3.7 the runtime includes an optional image support module
+(previously hsa-ext-rocr-dev).  By default this module is included in builds of
+the runtime.  The image module may be excluded the runtime by setting
+cmake variable IMAGE_SUPPORT to OFF.
+
+When building the optional image module additional build dependencies are
+required.  An amdgcn compatible clang and device library must be installed
+to build the image module.  The latest version of these requirements can be
+obtained from the ROCm package repository
+(see: https://rocmdocs.amd.com/en/latest/Installation_Guide/Installation-Guide.html)
+The latest source for these projects may be found here:
+
+https://github.com/RadeonOpenCompute/llvm-project
+
+https://github.com/RadeonOpenCompute/ROCm-Device-Libs
+
+Additionally xxd must be installed.
+
+The runtime optionally supports use of the cmake user package registry.  By
+default the registry is not modified.  Set cmake variable
+EXPORT_TO_USER_PACKAGE_REGISTRY to ON to enable updating the package registry.
+
+For example, to build, install, and produce packages on a system with standard
+ROCm packages installed, execute the following from src/:
 
     mkdir build
     cd build
-    cmake -DHSAKMT_INC_PATH:STRING=<path to directory holding hsakmt.h> \
-          -DHSAKMT_LIB_PATH:STRING=<path to directory holding libhsakmt.so.1> \
-          ..
+    cmake -DCMAKE_INSTALL_PATH=/opt/rocm ..
     make
-    
-alternately using ccmake:
+    make install
+    make package
+
+Example with a custom installation path, build dependency path, and options:
+
+    ...
+    cmake -DIMAGE_SUPPORT=OFF \
+          -DEXPORT_TO_USER_PACKAGE_REGISTRY=ON \
+          -DCMAKE_VERBOSE_MAKEFILE=1 \
+          -DCMAKE_PREFIX_PATH=<alternate path(s) to build dependencies> \
+          -DCMAKE_INSTALL_PATH=<custom install path for this build> \
+          ..
+    ...
+
+Alternately ccmake and cmake-gui are supported:
 
     mkdir build
     cd build
@@ -64,6 +101,21 @@ alternately using ccmake:
     press g to generate and exit
     make
 
+#### Building against the runtime
+
+The runtime provides a cmake package config file, installed by default to
+/opt/rocm/lib/cmake/hsa-runtime64.  The runtime exports cmake target
+hsa-runtime64 in namespace hsa-runtime64.  A cmake project (Foo) using the
+runtime may locate, include, and link the runtime with the following template:
+
+    Add /opt/rocm to CMAKE_PREFIX_PATH.
+
+    find_package(hsa-runtime64::hsa-runtime64 1.0 REQUIRED)
+    ...
+    add_library(Foo ...)
+    ...
+    target_link_library(Foo PRIVATE hsa-runtime64::hsa-runtime64)
+
 #### Specs
 
 http://www.hsafoundation.com/standards/
@@ -147,9 +199,7 @@ The device specific layer contains implementations of the C++ interface classes
 
 #### Known Issues
 
-* Max total coarse grain region limit is 8GB.
 * hsa_agent_get_exception_policies is not implemented.
-* Image import/export/copy/fill only support image created with memory from host accessible region.
 * hsa_system_get_extension_table is not implemented for HSA_EXTENSION_AMD_PROFILER.
 
 #### Disclaimer