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2022-12-10u-boot: Add qemu_arm64_12mb boardAlper Nebi Yasak
Add a U-Boot payload build for the QEMU AArch64 virtual machine. The config is same as upstream "qemu-arm64" defconfig, but SYS_TEXT_BASE is set to 0x50000000 so that it doesn't conflict with coreboot. QEMU auto-generates and passes a device-tree file to U-Boot at runtime, there's no compile-time canonical version, so there's no need to set REMAKE_ELF or OF_EMBED. It's not immediately obvious if QEMU-specific drivers are available to support display output, but most coreboot integration is unavailable (depends on x86) and entire video subsystem is disabled in the U-Boot upstream defconfig. Signed-off-by: Alper Nebi Yasak <alpernebiyasak@gmail.com>