random things I made and things I learnt making them
Typically it should just work but there are some catches when using a docker container environment. NOTE: You don't need to create a bridge between the host NIC and the TAP device. When you run runqemu the tap device is automatically created to match the subnet of the network interface in the guest OS. See…
1. install ftdi-eeprom and libftdi using apt…
Use the ROOTFS_POSTPROCESS_COMMAND to specify a list of functions to call once the OpenEmbedded build system has created the root filesystem. Create a rootfs/ directory in the image recipe directory.…
Running tasks using bitbake: Run task on specific multiconfig: bitbake mc:<config>:<recipe> -c cleanall bitbake mc:<config>:<recipe> -c configure `bitbake mc:: -e | grep ^BB_CURRENT_MC=`` Run task on multiconfig and default config (only one target can be used with the –environment option): bitbake mc:<config>:<recipe> <recipe> -c cleanall bitbake mc:<config>:<recipe> <recipe> -c configure Testing the current multiconfig within…
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…
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…
Edit the GIT_TAG and GIT_TAG_PATCHED variables as required.…
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…
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.…
MCIMX6UL-EVKB is a i.MX 6UltraLite Evaluation Kit. It uses the NXP i.MX 6ULL (900 MHz Arm Cortex®-A7 core, MCIMX6Y2DVM09AB). Instructions based on the porting guide - https://www.nxp.com/docs/en/user-guide/IMX_PORTING_GUIDE.pdf 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…
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.…
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…
So you have the discovery kit and you have run the example image on the SD card. But how do you build an OpenSTLinux image from scratch with Yocto, using a device tree file file generated by STM32CubeIDE? We will go through the build chain setup, the device tree configuration and the build process. There…
This is a completed version of the What I wish I’d known about Yocto Project page in the Yocto documentation. 1. Deal with corporate proxies Use environment variables or ChameleonSocks. https://wiki.yoctoproject.org/wiki/Working_Behind_a_Network_Proxy 2. Add a package to an image To add a package to your image using the local configuration file, use the IMAGE_INSTALL variable with…
1. Incorrect use of getVar in xserver-xf86-config_0.1.bbappend…
Using Dynamic Debug (debugfs) Check dynamic debug option is enabled in the kernel build…