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Demo code for linux.conf.au "Linux: the first second" presentation
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linux.conf.au 2018 demo files Alison Chaiken, firstname.lastname@example.org This repository collects scripts and patches that were created for the "Linux: the First Second" talk at linux.conf.au 2018: https://rego.linux.conf.au/schedule/presentation/16/ What's in the subdirectories: 0. custom_initrd: a script to unpack the initrd in /boot that matches the running kernel, add a specified file to it in a specified subdirectory, and then repack into a new initrd. The motivation for the script is that the instructions regarding the use of cpio for initrd's the kernel source in Documentation/acpi/initrd_table_override.txt and Documentation/filesystems/ramfs-rootfs-initramfs.txt no longer work as of kernel 4.13 and Debian Buster. 1. starting_ELF: -- For x86_64, these scripts download the GLIBC and coreutils source, compile coreutils with symbols, and create symlinks to help GDB find the GLIBC symbols. GDB is started in such a way that the user can easily read the assembly constructor startup code in start.S that is part of the ELF interpreter. -- For ARM, provide an explanation of how to use the Linaro toolchain and sysroot to cross-compile a random C file and inspect its symbols with cross-GDB. Similar symlinking into the GLIBC source is needed as with x86_64. 2. u-boot_sandbox: make_test_disk.sh creates a toy block 'device' for u-boot's sandbox to read. The tiny patches to the u-boot code configure the sandbox image to read the kernel and device-tree from the block device and try (obviously without success) to boot them on x86_64.