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…
random things I made and things I learnt making them
Category: Embedded Linux
FTDI Linux Misery
1. install ftdi-eeprom and libftdi using apt chris@chris-MacBookPro:~$ apt list –installed | grep ftdi ftdi-eeprom/jammy,now 1.5-5build3 amd64 [installed] libftdi1-2/jammy,now 1.5-5build3 amd64 [installed] libftdi1-dev/jammy,now 1.5-5build3 amd64 [installed] libftdi1-doc/jammy,jammy,now 1.5-5build3 all [installed,automatic] 2. Update udev rules Add a script that will unload the ftdi_sio and usbserial drivers. These drivers conflict with the libftdi driver and prevent ftdi_eeprom…
Yocto rootfs overlay
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. ROOTFS_POSTPROCESS_COMMAND += “rfs_overlay;” rfs_overlay() { rsync -a {THISDIR}/rootfs/*{WORKDIR}/rootfs }
Yocto MULTICONFIG recipe control
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…
EL2 virtualization on Zynq Ultrascale+ notes
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…
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!)