May 2026 - Openamp-rp - lists.openampproject.org

Unique Device Status value to indicate reset request

by Bill Mills

TLDR: virtio-remoteproc device reset To request a device reset (w/ acknowledgement), the driver should val = Status field // read current status field val |= 0x82 // set bits 7 and 1 (FAILED and DRIVER) val &= 0xfe // clear bit 0 (ACKNOWLEDGE) // leave other bits unchanged Status field = val // write the new status field value The driver should then poll the status field waiting for it to be == 0. Note: writing the status field to 0 when it is already non-zero, should continue to work as a device reset but the driver will not know when it is complete. Background: From the virtio spec [1] with extra clarity added by me. Status Field bits: (Spec section 2.1, html [2]) bit 0, 0x01, dec 1 ACKNOWLEDGE bit 1, 0x02, dec 2 DRIVER bit 2, 0x04, dec 4 DRIVER_OK (also used in suspend protocol) bit 3, 0x08, dec 8 FEATURES_OK bit 4, 0x10, dec 16 SUSPEND only used if negotiated bit 5, 0x20, dec 32 (currently unused) bit 6, 0x40, dec 64 DEVICE_NEEDS_RESET bit 7, 0x80, dec 128 FAILED All bits except DEVICE_NEEDS_RESET are set (and sometimes cleared) by the device. DEVICE_NEEDS_RESET is set by the device and should only be cleared by a reset. Logically the driver sets ACKNOWLEDGE, then DRIVER, then DRIVER_OK, then FEATURES_OK. Some of these could be set at the same time but never higher bits before lower bits. Once these bits are set, the driver in not allowed to clear them except by issuing a device reset. The one exception to this is that the DRIVER_OK bit is cleared and set as part of the SUSPEND protocol but only if it has been negotiated. The driver sets the FAILED bit when it has given up on the device. It is valid for FAILED with any of the following settings: 0b1xxx_0000 Fail before ack 0b1xxx_0001 Fail before driver found 0b1xxx_0011 Fail before driver OK 0b1xxx_0111 Fail before features OK 0b1xxx_1111 Fail after features OK And if SUSPEND has been negotiated 0b1xx1_0011 Fail while suspend active before features OK 0b1xx1_1011 Fail while Suspend active after features OK FAILED(0x80) and DRIVER (0x02) active with ACKNOWLEDGE(0x01) cleared is not a value that is possible in the base spec. Therefore we use this setting to request a reset w/ acknowledgement. 0b1xxx_xx10 Reset Request w/ acknowledgement TBD: Does/Should the driver send a notification on Status field change? Does/Should the device send a notification on Status field change? Sending the notice eliminates the need for a time on the other side to poll. Do we already support this? If not, probibly not worth it just for this protocol. Recent virtio-mmio enhancement: The patch in [3] is now in the virtio spec master branch but is not part of any released version yet. The patch adds a new V3 version of virtio-mmio where the driver can issue a non-blocking reset request and poll the status field to know when it is done. So we are not the only ones to notice this issue. However the solution used for virtio-mmio still requires trap and emulate to work and wont work if the Status field in located in normal memory of any type. In the patch the driver still writes 0 to the status field but the device is allowed to return from the MMR write with the status filed non-zero. The driver then waits for the status field to become zero to know when this operation is complete. This solution will not work for us as we use a real memory to store the status field and the driver writing that to 0 will take immediate effect and the driver then polling for zero would succeed immediately. Bill [1] https://docs.oasis-open.org/virtio/virtio/v1.4/virtio-v1.4.html [2] https://docs.oasis-open.org/virtio/virtio/v1.4/virtio-v1.4.html#x1-110001 [3] https://github.com/Linaro/virtio-msg-spec/commit/a1883517ee44cc03d1b621a331… -- Bill Mills Principal Technical Consultant, Linaro +1-240-643-0836 TZ: US Eastern Work Schedule: Tues/Wed/Thur

1 week, 2 days

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[OpenAMP/openamp-system-reference]

by Arnaud Pouliquen

Branch: refs/tags/v2026.04.0 Home: https://github.com/OpenAMP/openamp-system-reference To unsubscribe from these emails, change your notification settings at https://github.com/OpenAMP/openamp-system-reference/settings/notifications

1 week, 2 days

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[OpenAMP/openamp-system-reference] 1da73a: legacy_apps: echo: include new header

by Tanmay

Branch: refs/heads/main Home: https://github.com/OpenAMP/openamp-system-reference Commit: 1da73a753bcb21da5b8e2c82448fe0ad25227439 https://github.com/OpenAMP/openamp-system-reference/commit/1da73a753bcb21da… Author: Tanmay Shah <tanmay.shah(a)amd.com> Date: 2026-05-28 (Thu, 28 May 2026) Changed paths: M examples/legacy_apps/examples/echo/freertos/main.c M examples/legacy_apps/examples/echo/generic/main.c M examples/legacy_apps/examples/echo/rpmsg-echo.c Log Message: ----------- legacy_apps: echo: include new header platform_info.h was changed to platform_info_common.h, replace it accordingly for echo demo. Signed-off-by: Tanmay Shah <tanmay.shah(a)amd.com> Commit: 006207d033326610db2297d2523a289a08b5aefd https://github.com/OpenAMP/openamp-system-reference/commit/006207d033326610… Author: Tanmay Shah <tanmay.shah(a)amd.com> Date: 2026-05-28 (Thu, 28 May 2026) Changed paths: M examples/legacy_apps/examples/matrix_multiply/matrix_multiply.h Log Message: ----------- legacy_apps: matrix_multiply: fix compiler warning fix following compiler warning: warning: passing argument 1 of 'rpmsg_matrix_app' fr om incompatible pointer type [-Wincompatible-pointer-types] 47 | rpmsg_matrix_app(rpdev, platform); | ^~~~~ Signed-off-by: Tanmay Shah <tanmay.shah(a)amd.com> Commit: bb8eb62f53551b93f25eaa3170fc767a301f4466 https://github.com/OpenAMP/openamp-system-reference/commit/bb8eb62f53551b93… Author: Tanmay Shah <tanmay.shah(a)amd.com> Date: 2026-05-28 (Thu, 28 May 2026) Changed paths: M examples/legacy_apps/machine/xlnx/zynqmp_r5/CMakeLists.txt M examples/legacy_apps/machine/xlnx/zynqmp_r5/linker_large_text.ld M examples/legacy_apps/machine/xlnx/zynqmp_r5/linker_remote.ld M examples/legacy_apps/machine/xlnx/zynqmp_r5/platform_info.c Log Message: ----------- legacy_apps: xlnx: update reserved mem regions As per latest SDT standard AMD-xilinx EDF yocto is released with fixed memory regions for each core to use. Update the default address for cluster-A core0 to use as per this standard. Signed-off-by: Tanmay Shah <tanmay.shah(a)amd.com> Commit: 98cee13295fa997c40c36a8a04556c7c18dd7155 https://github.com/OpenAMP/openamp-system-reference/commit/98cee13295fa997c… Author: Tanmay Shah <tanmay.shah(a)amd.com> Date: 2026-05-28 (Thu, 28 May 2026) Changed paths: M examples/legacy_apps/machine/xlnx/zynqmp_r5/platform_info.c M examples/legacy_apps/machine/xlnx/zynqmp_r5/rsc_table.c M examples/legacy_apps/machine/xlnx/zynqmp_r5/rsc_table.h Log Message: ----------- legacy_apps: zynqmp_r5: add trace buffer support trace buffer is a circular buffer to store logs. Linux remoteproc subsystem creates a debugfs file that can be used to print these logs on linux side. Signed-off-by: Tanmay Shah <tanmay.shah(a)amd.com> Compare: https://github.com/OpenAMP/openamp-system-reference/compare/49f9ef6d8adc...… To unsubscribe from these emails, change your notification settings at https://github.com/OpenAMP/openamp-system-reference/settings/notifications

1 week, 2 days

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[OpenAMP/openamp-system-reference] 49f9ef: legacy_apps: xlnx: fix build system for native cma...

by Tanmay

Branch: refs/heads/main Home: https://github.com/OpenAMP/openamp-system-reference Commit: 49f9ef6d8adc1459e300582a89f476878320e115 https://github.com/OpenAMP/openamp-system-reference/commit/49f9ef6d8adc1459… Author: Tanmay Shah <tanmay.shah(a)amd.com> Date: 2026-05-25 (Mon, 25 May 2026) Changed paths: M examples/legacy_apps/machine/xlnx/CMakeLists.txt Log Message: ----------- legacy_apps: xlnx: fix build system for native cmake build OPENAMP_APP_NAME variable is needed for xilinx specific build tools. Native cmake build doesn't need this variable, and so if it's not found then do not fail, and include project machine direcotry. This allows native cmake build to continue. Signed-off-by: Tanmay Shah <tanmay.shah(a)amd.com> To unsubscribe from these emails, change your notification settings at https://github.com/OpenAMP/openamp-system-reference/settings/notifications

1 week, 5 days

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[OpenAMP/open-amp] 6def53: README: remove deprecated cache options

by Jiaqi Yao

Branch: refs/heads/main Home: https://github.com/OpenAMP/open-amp Commit: 6def5356b86709941ccc8ebdcd0bce37901e425b https://github.com/OpenAMP/open-amp/commit/6def5356b86709941ccc8ebdcd0bce37… Author: Jiaqi Yao <yaojiaqi(a)lixiang.com> Date: 2026-05-21 (Thu, 21 May 2026) Changed paths: M README.md Log Message: ----------- README: remove deprecated cache options Remove the split dcache CMake options from the README. The options were removed by d183f24 after being deprecated in favor of WITH_DCACHE. Document only WITH_DCACHE as the supported way to enable cache operations for vrings, buffers and resource table. Signed-off-by: Jiaqi Yao <yaojiaqi(a)lixiang.com> To unsubscribe from these emails, change your notification settings at https://github.com/OpenAMP/open-amp/settings/notifications

2 weeks, 2 days

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[OpenAMP/openamp-system-reference] 843ec1: west: Update to Zephyr 4.4

by Arnaud Pouliquen

Branch: refs/heads/main Home: https://github.com/OpenAMP/openamp-system-reference Commit: 843ec100a54e73429694dbcfe7d91640f6378402 https://github.com/OpenAMP/openamp-system-reference/commit/843ec100a54e7342… Author: Arnaud Pouliquen <arnaud.pouliquen(a)foss.st.com> Date: 2026-05-12 (Tue, 12 May 2026) Changed paths: M west.yml Log Message: ----------- west: Update to Zephyr 4.4 Update to latest Zephyr release, 4.4.0. Signed-off-by: Arnaud Pouliquen <arnaud.pouliquen(a)foss.st.com> To unsubscribe from these emails, change your notification settings at https://github.com/OpenAMP/openamp-system-reference/settings/notifications

3 weeks, 4 days

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[OpenAMP/open-amp] e2ba08: cmake: Remove unused CMake variables MACHINE and P...

by Andrew Davis

Branch: refs/heads/main Home: https://github.com/OpenAMP/open-amp Commit: e2ba0839a7c9d28ba8b14fcb87ce91b51bbd1fed https://github.com/OpenAMP/open-amp/commit/e2ba0839a7c9d28ba8b14fcb87ce91b5… Author: Andrew Davis <afd(a)ti.com> Date: 2026-05-11 (Mon, 11 May 2026) Changed paths: M cmake/options.cmake M cmake/platforms/zynqmp_linux.cmake M cmake/platforms/zynqmp_r5_generic.cmake M cmake/syscheck.cmake Log Message: ----------- cmake: Remove unused CMake variables MACHINE and PROJECT_MACHINE These were used when this repo contained machine specific examples. With those moved to the openamp-system-reference project, these CMake variables are now unused. Remove them. Signed-off-by: Andrew Davis <afd(a)ti.com> Commit: dc65de1e017bbb7119c4b7e6a7eb223a8ac1d2e8 https://github.com/OpenAMP/open-amp/commit/dc65de1e017bbb7119c4b7e6a7eb223a… Author: Andrew Davis <afd(a)ti.com> Date: 2026-05-11 (Mon, 11 May 2026) Changed paths: M cmake/options.cmake Log Message: ----------- cmake: Remove unused CMake variable PROJECT_PROCESSOR This CMake variable is unused, looks to be copied over from libmetal CMake files. Remove it. Signed-off-by: Andrew Davis <afd(a)ti.com> Commit: 468343399cea8b3b35b3de2a82e360ed2cdfd897 https://github.com/OpenAMP/open-amp/commit/468343399cea8b3b35b3de2a82e360ed… Author: Andrew Davis <afd(a)ti.com> Date: 2026-05-11 (Mon, 11 May 2026) Changed paths: A cmake/platforms/arm64_generic.cmake A cmake/platforms/arm64_linux.cmake A cmake/platforms/arm_r5_generic.cmake R cmake/platforms/zynqmp_a53_generic.cmake R cmake/platforms/zynqmp_linux.cmake R cmake/platforms/zynqmp_r5_generic.cmake Log Message: ----------- cmake: Rename platform example cmake files There is nothing "zynqmp" specific in these files, rename them to generic ARM names. Having only "zynqmp" files in platforms as before might give the impression only ZynqMP platforms are supported by this project. Signed-off-by: Andrew Davis <afd(a)ti.com> Compare: https://github.com/OpenAMP/open-amp/compare/5bcc7c0401ca...468343399cea To unsubscribe from these emails, change your notification settings at https://github.com/OpenAMP/open-amp/settings/notifications

3 weeks, 5 days

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[OpenAMP/openamp-system-reference] 9939c5: examples: Zephyr: rpmsg-multi-service: update conf...

by Iulia Prodan

Branch: refs/heads/main Home: https://github.com/OpenAMP/openamp-system-reference Commit: 9939c56b72a5a14af014740f704327dee1298cc9 https://github.com/OpenAMP/openamp-system-reference/commit/9939c56b72a5a14a… Author: Iuliana Prodan <iuliana.prodan(a)nxp.com> Date: 2026-05-11 (Mon, 11 May 2026) Changed paths: M examples/zephyr/rpmsg_multi_services/boards/imx8mp_evk_mimx8ml8_adsp.conf Log Message: ----------- examples: Zephyr: rpmsg-multi-service: update config overlay for i.MX8MP Replace IPM_IMX_FW_READY_REPLY with vendor-specific resource table configuration to align with Zephyr upstream implementation. Signed-off-by: Iuliana Prodan <iuliana.prodan(a)nxp.com> To unsubscribe from these emails, change your notification settings at https://github.com/OpenAMP/openamp-system-reference/settings/notifications

3 weeks, 5 days

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[OpenAMP/libmetal] bd97c9: examples: Remove remaining examples

by Andrew Davis

Branch: refs/heads/main Home: https://github.com/OpenAMP/libmetal Commit: bd97c9a28a236a3af41c424aa1eabaa38bd5831d https://github.com/OpenAMP/libmetal/commit/bd97c9a28a236a3af41c424aa1eabaa3… Author: Andrew Davis <afd(a)ti.com> Date: 2026-05-11 (Mon, 11 May 2026) Changed paths: M CMakeLists.txt M README.md R examples/CMakeLists.txt R examples/system/CMakeLists.txt R examples/system/freertos/CMakeLists.txt R examples/system/freertos/xlnx_r5/CMakeLists.txt R examples/system/freertos/xlnx_r5/amp_demo/CMakeLists.txt R examples/system/freertos/xlnx_r5/amp_demo/common.h R examples/system/freertos/xlnx_r5/amp_demo/ipi_latency_demod.c R examples/system/freertos/xlnx_r5/amp_demo/ipi_shmem_demod.c R examples/system/freertos/xlnx_r5/amp_demo/libmetal_amp_demod.c R examples/system/freertos/xlnx_r5/amp_demo/lscript.ld R examples/system/freertos/xlnx_r5/amp_demo/platform_config.h R examples/system/freertos/xlnx_r5/amp_demo/shmem_atomic_demod.c R examples/system/freertos/xlnx_r5/amp_demo/shmem_demod.c R examples/system/freertos/xlnx_r5/amp_demo/shmem_latency_demod.c R examples/system/freertos/xlnx_r5/amp_demo/shmem_throughput_demod.c R examples/system/freertos/xlnx_r5/amp_demo/sys_init.c R examples/system/freertos/xlnx_r5/amp_demo/sys_init.h R examples/system/generic/CMakeLists.txt R examples/system/generic/xlnx_r5/CMakeLists.txt R examples/system/generic/xlnx_r5/amp_demo/CMakeLists.txt R examples/system/generic/xlnx_r5/amp_demo/common.h R examples/system/generic/xlnx_r5/amp_demo/ipi_latency_demod.c R examples/system/generic/xlnx_r5/amp_demo/ipi_shmem_demod.c R examples/system/generic/xlnx_r5/amp_demo/libmetal_amp_demod.c R examples/system/generic/xlnx_r5/amp_demo/lscript.ld R examples/system/generic/xlnx_r5/amp_demo/platform_config.h R examples/system/generic/xlnx_r5/amp_demo/shmem_atomic_demod.c R examples/system/generic/xlnx_r5/amp_demo/shmem_demod.c R examples/system/generic/xlnx_r5/amp_demo/shmem_latency_demod.c R examples/system/generic/xlnx_r5/amp_demo/shmem_throughput_demod.c R examples/system/generic/xlnx_r5/amp_demo/sys_init.c R examples/system/generic/xlnx_r5/amp_demo/sys_init.h R examples/system/linux/CMakeLists.txt R examples/system/linux/xlnx/CMakeLists.txt R examples/system/linux/xlnx/zynqmp_amp_demo/CMakeLists.txt R examples/system/linux/xlnx/zynqmp_amp_demo/common.h R examples/system/linux/xlnx/zynqmp_amp_demo/ipi_latency_demo.c R examples/system/linux/xlnx/zynqmp_amp_demo/ipi_shmem_demo.c R examples/system/linux/xlnx/zynqmp_amp_demo/libmetal_amp_demo.c R examples/system/linux/xlnx/zynqmp_amp_demo/libmetal_amp_demod.c R examples/system/linux/xlnx/zynqmp_amp_demo/shmem_atomic_demo.c R examples/system/linux/xlnx/zynqmp_amp_demo/shmem_demo.c R examples/system/linux/xlnx/zynqmp_amp_demo/shmem_latency_demo.c R examples/system/linux/xlnx/zynqmp_amp_demo/shmem_throughput_demo.c R examples/system/linux/xlnx/zynqmp_amp_demo/sys_init.c R examples/system/linux/xlnx/zynqmp_amp_demo/sys_init.h Log Message: ----------- examples: Remove remaining examples Moving the vendor specific examples over to openamp-system-reference was slated for 2024.10 (~2 years ago). Some have been moved, others seem to be abandoned. Remove remaining examples. Signed-off-by: Andrew Davis <afd(a)ti.com> To unsubscribe from these emails, change your notification settings at https://github.com/OpenAMP/libmetal/settings/notifications

3 weeks, 5 days

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OpenAMP Official v2026.04 release is now available

by Arnaud POULIQUEN

Hello OpenAMP developers and community, The v2026.04 release is now available for both the OpenAMP and libmetal libraries. For details about this release, please refer to the release notes: - libmetal: v2026.04.0<https://github.com/OpenAMP/libmetal/releases/tag/v2026.04.0> - open-amp: v2026.04.0<https://github.com/OpenAMP/open-amp/releases/tag/v2026.04.0> The system-reference and openamp-docs repositories are scheduled for release in May. Thank you all for your valuable contributions to the maintenance and development of these libraries. Best regards, The OpenAMP Team Hello OpenAMP developers and community, The v2026.04 release is now available for both the OpenAMP and libmetal libraries. For details about this release, please refer to the release notes: - libmetal: [1]v2026.04.0 - open-amp: [2]v2026.04.0 The system-reference and openamp-docs repositories are scheduled for release in May. Thank you all for your valuable contributions to the maintenance and development of these libraries. Best regards, The OpenAMP Team References 1. https://github.com/OpenAMP/libmetal/releases/tag/v2026.04.0 2. https://github.com/OpenAMP/open-amp/releases/tag/v2026.04.0

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