![]() The alternative approach to hddimg, which we’re describing here, is to use WIC to generate an image (as a. WIC) became available, offering a far more flexible means of creating disk images. More recently the Open Embedded Image Creator tool (a.k.a. The use of only FAT, needed to boot the system by EFI or BIOS, means hddimg is unable to hold a rootfs image file of >4GB quite a limitation for some full-featured Yocto distributions. hddimg file, to be written to the USB drive, which contains a single FAT file system. In the earlier days of Yocto, the hddimg image type was the means of generating a self-booting / installing disc image, and was added by this line in nf: IMAGE_FSTYPES += " hddimg" ![]() The Yocto class poky/classes/image-live.bbclass is the basis of all live images – whether for generating a self-installer or simply booting a full Yocto image from a removable medium. This could be an ISO image, suitable for burning to a CD or DVD, or disk image suitable to writing with ‘dd’ directly to a USB drive. Yocto can build a variety of different types of ‘ live’ images, so called because the image can come alive directly from a removable storage medium without needing to be installed first. Further details may be found in the Yocto documentation and examples in the meta-amd and meta-intel layers. This blog post shows how to configure Yocto to generate a self-installing image for a genericx86-64 based distribution. The installation process is quick and professional.No additional tools are needed to load an image onto the target.This removes the need to create partitions and ‘finish off’ installation during first-boot. Target partitions are created during installation so the install script can create additional partitions that are not in the WIC image, and customise sizes to use all available storage.The WIC disc image is the minimal size needed to hold the root file system. ![]() For an embedded system that can boot from a USB drive this gives some significant advantages: ![]() Yocto also has the ability to generate a self-installing image, just like a desktop operating system. A minimal version of the OS then runs to perform the process of partitioning discs and installing the full OS. We are all familiar with the process of installing a desktop operating system onto a PC simply insert the installation media, typically a USB stick, and boot the device. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |