Hi All,
I'm currently thinking on how to integrate the ACPI support in u-boot x86. I've investigated the coreboot implementation. My first thought was to port all the source code over but looking at the source code in more details it doesn't look like an easy option. For example, it involves reading a lot of values over PCI to dynamically fill the tables, and integration a lot of SoC specific headers (IRQ definition, GPIO, ...).
Therefore, as a first implementation I was thinking about the following: - booting a board with the Intel UEFI + Linux - extracting all the ACPI tables (/sys/firmware/acpi/ or acpixtract) - disassembling the binaries tables via iasl to allow people to modify them - integrating these files into u-boot in board specific folder (for example: board/intel/minnowmax/acpi/*) - generating one blob per table using iasl during build time which requires iasl tool to be installed if we have the CONFIG_ACPI - writing at the RSDP location all the ACPI tables previously exported
With this flow, the integration would be quite simple. Also this allows the tables to be modified easily when there is a new release or to add some new devices to the DSDT.
What are your thoughts about that?
Feel free to provide some feedback on this implementation.
Thanks, Regards, Gabriel