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2021-01-07arch/x86: Move prologue to .init sectionKyösti Mälkki
For arch/x86 the realmode part has to be located within the same 64 KiB as the reset vector. Some older intel platforms also require 4 KiB alignment for _start16bit. To enforce the above, and to separate required parts of .text without matching *(.text.*) rules in linker scripts, tag the pre-C environment assembly code with section .init directive. Description of .init section for ELF: This section holds executable instructions that contribute to the process initialization code. When a program starts to run, the system arranges to execute the code in this section before calling the main program entry point (called main for C programs). Change-Id: If32518b1c19d08935727330314904b52a246af3c Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com> Reviewed-on: https://review.coreboot.org/c/coreboot/+/47599 Reviewed-by: Angel Pons <th3fanbus@gmail.com> Reviewed-by: Arthur Heymans <arthur@aheymans.xyz> Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
2020-10-30x86: Add a minimal example SoC along with a boardNico Huber
The min86 example SoC code along with the example mainboard should serve as a minimal example how a buildable x86 SoC code base can look like. This can serve, for instance, as a basis to add new SoCs to coreboot. Starting with a buildable commit should help with the review of the actual code, and also avoid any regressions when common coreboot code changes. As the example code itself is build-tested, it should advance with coreboot and can't rot like documentation might. It also serves as a check what APIs need to be implemented with the default Kconfig settings. Change-Id: Id76ab15fe77ae3e405c43f9c8677694f178be112 Signed-off-by: Nico Huber <nico.h@gmx.de> Reviewed-on: https://review.coreboot.org/c/coreboot/+/45710 Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org> Reviewed-by: Angel Pons <th3fanbus@gmail.com> Tested-by: build bot (Jenkins) <no-reply@coreboot.org>