[efi] Add support for locating the ACPI XSDT The EDK2 headers define a single structure for the ACPI 1.0 RSDP (including only an RSDT pointer) and redundantly define structures for the ACPI 2.0 RSDP, the ACPI 3.0 RSDP, the ACPI 4.0 RSDP, the ACPI 5.0 RSDP, the ACPI 5.1 RSDP, and the ACPI 6.0 RSDP, all of which are bytewise identical because the RSDP layout has not changed in any way since the XSDT pointer was added in ACPI 2.0. Use the XSDT in the ACPI 2.0+ RSDP if present (and if this is a 64-bit build), falling back to the RSDT in the ACPI 2.0+ RSDP if present, and finally the RSDT in the ACPI 1.0 RSDP. Signed-off-by: Michael Brown <mcb30@ipxe.org>
iPXE is the leading open source network boot firmware. It provides a full PXE implementation enhanced with additional features such as:
boot from a web server via HTTP or HTTPS,
boot from an iSCSI, FCoE, or AoE SAN,
control the boot process with a script,
You can use iPXE to replace the existing PXE ROM on your network card, or you can chainload into iPXE to obtain the features of iPXE without the hassle of reflashing.
iPXE is free, open-source software licensed under the GNU GPL (with some portions under GPL-compatible licences).
You can download the rolling release binaries (built from the latest commit), or use the most recent stable release.
For full documentation, visit the iPXE website.
