Exception Levels: Execution States: Security State Service Call Routing: Hypervisor mode executes at EL2 in the AArch32 state. EL2 is implemented only in a non-secure state, to support guest operating system management. EL2 virtualization provides: virtual values for the contents of a small number of identification registers traps for EL2 exceptions (a hypervisor might be…
random things I made and things I learnt making them
Category: Microprocessors
Ultrascale+ PL Full/Partial configuration
Using Processor Configuration Access Port (PCAP) Device tree overlays are not supported by Xilinx DTG and must be hand-crafted Kernel configuration is required Note, partial reconfiguration of the PL regions requires partioning of the bitstream into blocks so that they can be replaced as part of a higher level bitstream design. As far as I…
Downloading Xilinx Yocto layers without git-repo
Edit the GIT_TAG and GIT_TAG_PATCHED variables as required. #!/bin/bash GIT_CMD=”git clone –recurse-submodules –progress -c advice.detachedHead=false” GIT_URL=https://github.com/Xilinx GIT_TAG=”-b xlnx-rel-v2022.1″ GIT_TAG_PATCHED=”-b xlnx-rel-v2022.1_update2″ declare -A url=( [meta-browser]=”{GIT_CMD}{GIT_TAG} {GIT_URL}/meta-browser” [meta-clang]=”{GIT_CMD} {GIT_TAG}{GIT_URL}/meta-clang” [meta-jupyter]=”{GIT_CMD}{GIT_TAG} {GIT_URL}/meta-jupyter” [meta-mingw]=”{GIT_CMD} {GIT_TAG}{GIT_URL}/meta-mingw” [meta-openamp]=”{GIT_CMD}{GIT_TAG} {GIT_URL}/meta-openamp” [meta-openembedded]=”{GIT_CMD} {GIT_TAG}{GIT_URL}/meta-openembedded” [meta-petalinux]=”{GIT_CMD}{GIT_TAG} {GIT_URL}/meta-petalinux” [meta-python2]=”{GIT_CMD} {GIT_TAG}{GIT_URL}/meta-python2″ [meta-qt5]=”{GIT_CMD}{GIT_TAG} {GIT_URL}/meta-qt5″ [meta-som]=”{GIT_CMD} {GIT_TAG}{GIT_URL}/meta-som” [meta-security]=”{GIT_CMD}{GIT_TAG} {GIT_URL}/meta-security” [meta-som]=”{GIT_CMD} {GIT_TAG}{GIT_URL}/meta-som” [meta-virtualization]=”{GIT_CMD}{GIT_TAG} {GIT_URL}/meta-virtualization” [meta-xilinx]=”{GIT_CMD} {GIT_TAG}{GIT_URL}/meta-xilinx” [poky]=”{GIT_CMD}{GIT_TAG} {GIT_URL}/poky” [yocto-manifests]=”{GIT_CMD} {GIT_TAG}{GIT_URL}/yocto-manifests”…
Xilinx Yocto reading list
Performance Local shared download/sstate caches. Site shared download mirrors. hash equivelance sstate server. https://www.thegoodpenguin.co.uk/blog/improving-yocto-build-time/ Secureboot Susbsystem Use Secure Boot Features to Protect Your Design Zynq UltraScale+ MPSoC Software Developer Guide -> Security Features Zynq UltraScale+ MPSoC Embedded Design Tutorial » Boot and Configuration ARM Trusted Firmware Docs Xilinx ATF Development Workflow eSDK PetaLinux PetaLinux vs…
Setup USB Gadget Ethernet on Beaglebone Black
Introduction Here we want to enable network access between the target board and the host dev. Rather than use the ethernet interface (which may not always be available on the target) we can provide power and connect via ethernet to the target board using the USB interface and the USB Gadget framework provided by Linux.…
Modifying U-Boot Kconfig with configuration fragments and Yocto on the MCIMX6UL-EVKB evaluation board
Your eval board boots, but it hangs during the “starting linux kernel” message. You can’t debug the Linux kernel because it hasn’t loaded yet. So the next option is to debug the preceding U-Boot bootloader. This article explains how to configure a Yocto layer to modify the Uboot Kconfig settings (without hacking about in the tmp/work directory!)
Adding user configuration to device files using STM32CubeIDE’s “Device Configuration Tool”
The STM32CubeIDE can be used to generate device tree source file (.dts) for your embedded linux image. These describe the hardware for the board on which linux will run. This is compiled into a device tree binary file (.dtb) which is included on the image and loaded by u-boot along with the Linux kernel zImage.
In this article we are going to create two STM32CubeIDE projects – a DK-2 project with all the presets and a custom project for the custom board – and compare them side-by-side.
Designing a custom STM32MP1 board for embedded Linux using Yocto and OpenSTLinux
Custom Board Design First lets discuss the hardware. There are vendor boards available: Evaluation boards are expensive due to the large number of external connectors and integrated circuitry (including FPGAs and HDMI decoders!). These are really meant for sales demos. Any development work done on these would be wasted time since your own custom design…
Using STM32CubeIDE to generate device tree files for the STM32MP157F-DK2
So you have the discovery kit and you’ve run the example image on the SD card. How do you build the image from scratch with Yocto and using a DTS file generated by STM32CubeIDE?
Building Yocto image for BeagleBoneBlack
Some issues encountered when building the Yocto BSP for AM335x with the BeagleBone Black, and their solutions.